The human body is made up of trillions of cells. Cells of the nervous system, called nerve cells or neurons, are specialized to carry "messages" through an electrochemical process. The human brain has approximately 86 billion neurons. To learn how neurons carry messages, read about the action potential.
Neurons come in many different shapes and sizes. Some of the smallest neurons have cell bodies that are only 4 microns wide. Some of the biggest neurons have cell bodies that are 100 microns wide. (Remember that 1 micron is equal to one thousandth of a millimeter!).
Neurons are similar to other cells in the body because:
Neurons are surrounded by a cell membrane.
Neurons have a nucleus that contains genes.
Neurons contain cytoplasm, mitochondria and other organelles.
Neurons carry out basic cellular processes such as protein synthesis and energy production.
However, neurons differ from other cells in the body because:
Neurons have specialize cell parts called dendrites and axons. Dendrites bring electrical signals to the cell body and axons take information away from the cell body.
Neurons communicate with each other through an electrochemical process.
Neurons contain some specialized structures (for example, synapses) and chemicals (for example, neurotransmitters).
The Neuron
neuron
One way to classify neurons is by the number of extensions that extend from the neuron's cell body (soma).
bipolar neuron
Bipolar neurons have two processes extending from the cell body (examples: retinal cells, olfactory epithelium cells).
Pseudounipolar cells (example: dorsal root ganglion cells). Actually, these cells have 2 axons rather than an axon and dendrite. One axon extends centrally toward the spinal cord, the other axon extends toward the skin or muscle.
Multipolar neurons have many processes that extend from the cell body. However, each neuron has only one axon (examples: spinal motor neurons, pyramidal neurons, Purkinje cells).
Neurons can also be classified by the direction that they send information.
Sensory (or afferent) neurons: send information from sensory receptors (e.g., in skin, eyes, nose, tongue, ears) TOWARD the central nervous system.
Motor (or efferent) neurons: send information AWAY from the central nervous system to muscles or glands.
Interneurons: send information between sensory neurons and motor neurons. Most interneurons are located in the central nervous system.
Check out the Gallery of Neurons to see some pictures of real neurons or "Sidewalk Cells" to see photographs of neurons on the street.
Hear It
"Neuron" | "Axon" | "Dendrite" |
"Nissl" | "Mitochondria" | "Endoplasmic reticulum"
There are several differences between axons and dendrites:
The introduction of zebra mussels in the Great Lakes is an example of which type of release? The introduction of zebra mussels in the Great Lakes is an example of release.
The introduction of zebra mussels in the Great Lakes is an example of accidental release from ballast water in a foreign container ship.
Answer:
The introduction of zebra mussels in the Great Lakes is an example of an unintentional or accidental release.
Explanation:
The zebra mussel known biologically as Dreissera Polymorph's, is a small freshwater mussel which its species was originally from the lakes in Southern Russia and Ukraine. Known globally as invasive species, they got their name through the striped pattern which are mostly seen on their shells.
Zebra mussels were noticed in Canada in the Great Lakes in 1988 at lake St. Clair. They were believed to be unintentionally released into the lakes in the ballast water of ships going to oceans, traveling the St. Lawrence Seaway. Another belief was linked to the introduction or release through anchors and chains even though this belief has been described as mere speculation.
HELP!!!! YOU WILL GET 100 POINTS!! 1. What affect does the setting of the Bag-End have on the plot in the beginning of The Hobbit? a. It helps establish the easy, safe lifestyle that Bilbo is used to. b. It shows that Bilbo will not go on the adventure c. It explains why Gandalf thinks Bilbo would be a good burglar d. It reveals the conflict between Thorin and Bilbo. 2. Read the passage closely. The dwarves looked at him with quite a new respect, when he talked about dodging guards, jumping over Gollum, and squeezing through, as if it was not very difficult or alarming. Which team does this passage develop? a. Mercy is sometimes necessary and can lead to good things b. Greed is a powerful force that can be lead to ones downfall c. Girl always overcomes evil d. One is often surprised by misconceptions about others
1. is c and 2. is aHELP!!!! YOU WILL GET 100 POINTS!! 1. What affect does the setting of the Bag-End have on the plot in the beginning of The Hobbit? a. It helps establish the easy, safe lifestyle that Bilbo is used to. b. It shows that Bilbo will not go on the adventure c. It explains why Gandalf thinks Bilbo would be a good burglar d. It reveals the conflict between Thorin and Bilbo. 2. Read the passage closely. The dwarves looked at him with quite a new respect, when he talked about dodging guards, jumping over Gollum, and squeezing through, as if it was not very difficult or alarming. Which team does this passage develop? a. Mercy is sometimes necessary and can lead to good things b. Greed is a powerful force that can be lead to ones downfall c. Girl always overcomes evil d. One is often surprised by misconceptions about others
Answer:
To calculate or compute the magnitude of the velocity at whichever point in time, you’ll need to multiply the constant acceleration pace times the amount of time difference and then adding the result to the initial velocity
While To calculate or compute the horizontal component, the magnitude of the vector will just be multiplied by the cosine angle referenced to the horizontal
Explanation:
the diagram below represents levels of organisms
D organelle because youre talking about organs and cells well a organelle is a organ inside a cell
what are the two factors that create the difference between the temperate forest biome in the taiga biome
The temperate forest biome covers latitudes ranging approximately from the southern United States to southern Canada, while the taiga biome, also known as boreal forest, extends from the latitude of southern Canada to about 60 degrees north latitude. (see References 1, References 3) Thus, these two biomes are adjacent, which explains the many similarities between taiga and northern temperate forests. Both biomes have four distinct seasons, but the temperate forest climates cover a much wider range of temperatures and precipitation patterns. Taiga, in contrast, is reliably cold: most of the precipitation falls as snow, winters are severe and the growing season is short -- about 130 days compared to 140 to 200 days for temperate forests.
The two factors that create the difference between the temperate forest biome and the taiga biome are as follows:
Temperature.Precipitation. What is a biome?A biome may be characterized as a very large ecosystem that is consistently running in nature in an unmanaged way. In more simple words, it is defined as a very large area that is characterized by a particular type of vegetation. Some examples of biome may include tropical rainforests, coral reefs, grasslands, etc.
Taiga biomes are generally thick forests. Coniferous trees, such as spruce, pine, and fir, are common. These trees have needles instead of broad leaves, and their seeds grow inside protective, woody cones.
While temperate forests have deciduous trees which lose their leaves in winter, conifers never lose their needles. All such differences are created by numerous factors but temperature and precipitation are the most potent ones.
Therefore, temperature and precipitation are the two factors that create the difference between the temperate forest biome and the taiga biome.
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Which location is the source of magma
In the lower part of Earth's crust and in the upper part of the mantle.
The outermost shell of the earth made of the earth's crust and upper part of the mantle, and the asthenosphere, which is the layer below the lithosphere.
Friction is the force that one surface exerts on another when they rub together. Friction works in the direction opposite to the motion, causing the object to slow down. What is one way you could reduce the friction between two surfaces?
A.) Carpet the surfaces
B.) Put oil on the surfaces
C.) Put sand on the surfaces
D.) Allow one of the surfaces to rust
Answer is B
It is because I did this and got it right and also oil is a liquid so it will immediately stop whatever is coming.
Putting oil on the surfaces can reduce the friction between two surfaces.
Therefore, option B is correct.
What is friction?The resistance to motion created when two objects rub against one another is called friction. Friction occurs whenever two items come into contact with one another. Friction acts in the opposite direction from the motion and works against it. The two surfaces' respective materials have an impact on how much friction exists.
The force that prevents one solid item from moving across another is known as friction. Static friction, sliding friction, rolling friction, and fluid friction are the four main categories of friction. It is a contact force that acts between two surfaces.
Friction can be reduced by putting oil on the surface. Therefore, option B is correct.
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explain the relationship between a habitat and the organisms that live there.
The organisms need the habitat to live. This would be considered Commensalism because one benefits but the other isn't helped nor harmed. Hope this helped!
Answer:
A habitat is part of an ecosystem: it is the physical area, while an ecosystem is the physical area plus the living things in it.
Explanation:
Does gene therapy modify DNA
The tundra is cold year-round it has short cool summers and tong, severe winters. The tundra has a permanently frozen sublayer of soil called permafrost. Like the desert, the tundra receives little precipitation, about 4 to 10 inches per year, and what does fall is usually in the form of snow or ice. It has long days during the growing season, sometimes with 24 hours of daylight and long nights during the winter. Which adaptations would you expect to see in plants growing in the tundra?
With plants on the tundra, you would expect to see many Short-growing plants with Waxy coatings along with Fine hair-like structures. Each of those features help tundra plants withstand the cold and drying effects of the wind in those regions.
Small and Grow in clumps for protection from wind and cold.
Which of the following contains the greatest number of unipotent stem cells? A. 6-week-old embryo B. Blastocyst C. Adult D. 3-day-old embryo
The correct answer is option C
Unipotent stem cells are those stem cells that can form cells of one lineage only. An adult would be having the maximum number of unipotent stem cell as it has gone through the process of cell differentiation and the cell have been differentiated into different kinds of cells. For example: skin stem cells
The stem cells of embryo are mainly pleuripotent and multipotent that can form cells of different lineages.
You want to cultivate some exotic plants at your farm. However, the climate is chillier than the temperature range favorable to the crop. Which is the best method to use for the cultivation of this exotic crop?
A. use a crop rotation method B. use a lot of fertilizer C. prepare the seed bed properly D. use a greenhouse E. use irrigation
The correct answer is - D. use a greenhouse.
If the climate is not suitable for a certain exotic plant, and the reason for that is that it is colder than the place from where the plant originates, than the best solution is to plant it in a greenhouse.
The greenhouse will provide higher temperature for the plant throughout the whole year, so it is will have a proper temperature, similar to the one it is adapted to. Also, it will receive sufficient amounts of light. It will be protected from the outside influences such as the cold winds, snow, low temperatures, so it will have a good chance of growing.
Bread Mold Koala Bear Mushroom Oak Tree Student 1 Producer Consumer Producer Decomposer Student 2 Consumer Consumer Producer Decomposer Student 3 Decomposer Consumer Decomposer Producer Student 4 Decomposer Producer Decomposer Consumer Producers are organisms that obtain their energy from sunlight. Consumers obtain their energy from eating food. This food may be producers, other consumers, or both. Decomposers obtain their energy from the breakdown of decaying matter. Students are asked to make a table classifying four organisms as producer, consumer, or decomposer. Which student filled out the table correctly?
Student 3 is correct. Bread mold is a decomposed, a koala is a consumer, a mushroom is a decomposer, and an oak tree is a producer.
Answer:
Both get their energy by feeding on other organisms
Explanation:
Desceibe homeostasis and why is it important to an organism.
Homeostasis is maintaining a balanced internal condition in the body. Homeostasis is very important because in the wrong body conditions certain processes and proteins will not function properly.
Which matter exists in the liquid state at room temperature?
A. shirt
B. honey
C. helium
D. nebula
B) honey
A shirt is a solid, and helium is a gas at room temperature. A nebula is... not an object.
Honey exists in the liquid state at room temperature.
Hope this helps,
Davinia.
which process takes place last in the development of a human being?
Answer:
Neurulation
Explanation:
Neurulation of organogenesis is the last stage of human development. The gastrula stage forms three germ layers called ectoderm, mesoderm, and endoderm. The mesoderm form the notochord. A neural tube is developed from the ectoderm which differentiated into CNS and other nerves.
How does pain relievers work
When you take a pain reliever like ibuprofen, it keeps injured or damaged cells from making and releasing prostaglandin. When the cells don't release this chemical, it means that the brain won't get the pain message as quickly or clearly.
Pain reliever works by holding infected cells of secreting prostaglandin. It is primarily not produced and there will be no stimulus which will happen to feel the pain in the living organism. If someone takes a pain reliever then he will not feel pain because the cells will not send the stimulus to the brain hence the human body will not feel pain. Acetaminophen and ibuprofen are examples of pain reliever that are commonly used.
the kidney is an organ that collects wastes and excess water from the blood and sends them to the bladder where they are stored before being removed from the body. which two systems work together to perform this function?
1) immune and respiratory
2) circulatory and excretory
3) skeletal and nervous
4) digestive and circulatory
The two systems that work together to filter blood, remove waste and excess water, and maintain electrolyte balance are the circulatory system and the excretory system. The circulatory system transports blood to the kidneys, where it is filtered, and wastes are excreted as urine by the excretory system.
Explanation:You're correct to identify the kidneys as playing a critical role in waste removal and water regulation. The role of the kidneys is to filter blood, produce urine, and assist in maintaining water and electrolyte balance. The two systems that work together to perform these functions, based on your provided options, are the circulatory system and the excretory system.
The circulatory system is responsible for transporting blood containing metabolic wastes from cells to the kidneys. In the kidneys, more than a million tiny units called nephrons filter this blood. This filtration involves the removal of wastes and the formation of urine. The reabsorption of water, required ions, and useful compounds back into the capillaries that surround the tubules leaves the wastes behind, and this urine is subsequently collected in the bladder. So, the circulatory system and the kidneys (part of the excretory system) work collectively to filter blood, expel wastes, and maintain water and electrolyte balance.
The excretory system includes the kidneys, ureters, urinary bladder, and urethra, and it's responsible for the removal of waste from the body. The kidneys, as part of this system, ensure that undesirable substances and excess water are excreted from the body in the form of urine, which is stored in the bladder before being eliminated from the body through the urethra.
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The circulatory and excretory systems collaborate to help the body expel wastes and maintain water-salt balance. The circulatory system carries nutrient-rich blood to the kidneys, the blood is filtered, and essential substances are reabsorbed back into the bloodstream. The excretory system, specifically the kidneys, separates waste and concentrates it into urine for eventual excretion from the body.
Explanation:The two systems that work together to perform the function of collecting wastes and excess water from the blood and sending them to the bladder are the circulatory and excretory systems. The excretory system, particularly the kidneys, ureters, urinary bladder, and urethra, serve to remove metabolic wastes from the body and maintain water-salt balance through processes of filtration, reabsorption, and secretion carried out by the nephrons.
The circulatory system, on the other hand, delivers nutrient-rich blood to the kidneys, where waste products, excess water, and ions are filtered out and sent into the tubule system of the nephron. Healthy substances are reabsorbed back into the bloodstream, whereas body wastes are separated and concentrated into urine, which is then collected in the bladder for eventual excretion from the body through the urethra.
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20 POINTS!
1. What is the mass? Density= 6 g/mL. Volume= 42mL
2. What is the Volume? Mass= 4 grams. Density=2 g/mL
3. What is the Density? Mass=12 grams. Volume=4mL
4. What is the Density? Mass=121 grams. Volume= 11mL
5. What is the Volume? Mass= 25 grams. Density= 5 g/mL
6. What is the mass? Density= 10g/mL. Volume= 50mL
The branch of science which deals with chemicals and bonds is called chemistry.
The formula for using the question is as follows:-
[tex]M = V*D[/tex]
M= massV= volumeD= density.Put the value in the equation as all the data is given in the question.
[tex]M =6*42 = 252g\\\\V= \frac{4}{2} = 2L\\\\D= \frac{12}{4} = 3g/ml\\\\D = \frac{121}{11} = 11g/ml\\\\V= \frac{25}{5} = 5L\\\\M= 10*50= 500g[/tex]
Hence, these are the answer to the following.
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Do to an unusually high concentration of particles inside the cell, the membrane starts to expand and burst. Which problem is the cell most likely having?
A. The cell is unable to produce water molecules inside the cell.
B. The cell is unable get more water into the cell.
C. The cell is unable to build more protein molecules.
D. The cell is unable to maintain a stable internal environment.
Apex
Can you please help me? I need to pass my test I can't fail again.
Answer:
D
Explanation:
Apple maggots are a type of fly native to North America. Prior to the introduction of the apple tree to North America, apple maggots fed from and laid their eggs in hawthorn trees. After apple trees were introduced, some apple maggots began feeding from and laying their eggs on apple trees. Adult apple maggots will only mate on the type of tree on which they were born.
What is the most likely consequence of the introduction of apple trees to apple maggots?
A. Some apple maggots will undergo adaptive radiation to colonize many other types of trees besides the apple and hawthorn .
B. Populations of apple maggots that mate on different trees could become reproductively isolated and eventually speciate.
C. Apple maggots that are born on apple trees will be unable to reproduce and will eventually die out.
D. Individual apple maggots will eventually learn to lay eggs on both hawthorn trees and apple trees.
your answer is b hope this helps
The correct answer is option B
The population of maggots on the apple tree (apple maggot) that will mate on different trees could become reproductively isolated due to different habitat (ecological isolation).
Ecological isolation causes speciation by creating reproductive barriers between populations due to different habitats.The maggot populations will mate on different trees and will eventually speciate over a period of time.
To see a whole insect under a microscope, you would probably not use a...
A) Compound light microscope
B) Stereoscope microscope
C) Scanning electron microscope
D) Simple microscope
C.) Scanning electron microscope. You would not be able to see a whole insect with one of these.
Hope this helped :)
To observe a whole insect, a Compound light microscope would not be suitable since it's designed for viewing small, transparent samples at high magnification. A stereoscope microscope, which allows light to shine onto the specimen, is more appropriate for such observations.
Explanation:To see a whole insect under a microscope, you would probably not use a Compound light microscope. The correct tool for observing entire insects is a stereoscope microscope, also known as a dissecting microscope, which uses incident light to shine onto the specimen. This is because compound light microscopes are designed for viewing small samples at high magnifications with light passing through the specimen, which is not ideal for whole insects. Moreover, scanning electron microscopes provide detailed images of the surface of specimens but are not suitable for observing entire, live insects. Simple microscopes, offering a single lens for magnification, also do not suit the demands of viewing a whole insect in detail.
How is information on age structure and sex ratios useful to demographers?
Which are produced as a result of meiosis?
A. zygotes
B. chromosomes
C. tetrads
D. gametes
In 1957, the Russians launched the first successful orbiting satellite, called Sputnik. Which of these statements best explains why humans should continue to send orbiting satellites to space?
Question 12 options:
1)
They reflect hamful radiations in space.
2)
They provide useful information about space.
3)
They help change weather conditions on Earth.
4)
They stop comets and asteroids from striking Earth.
2 is the only logical answer
Answer:
B. They provide useful information about space.
Explanation:
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Which factor can decrease the kinetic energy of an object?
THX
If an object is going uphill it increases it fast.
scientists have found that although plants require light to carry on photosynthesis Very high levels of sunlight can kill some plants. this illustrates that many biochemical processes may occur) A. more rapidly when temperatures are very high) B. within a specific range of conditions) C. best in the absence of abiotic factors) D. even if homeostasis is disturbed) please help me with this hw question
The statement in the beginning of the question, "scientists have found that although plants require light to carry on photosynthesis Very high levels of sunlight can kill some plants" suggests that there is a certain range of levels of sunlight that plants can survive in. Therefore, only choice B. with a specific range of conditions is supported by the evidence. Hope I could help.
With a specific range of conditions is supported by the evidence is the correct option.
What is photosynthesis?Plants absorb water (H2O) and carbon dioxide (CO2) from the soil and atmosphere during photosynthesis. Water is oxidized, which means it loses electrons, while carbon dioxide is reduced, which means it gains electrons, inside the plant cell.
Water is converted into oxygen and carbon dioxide into glucose as a result. After storing energy within the glucose molecules, the plant releases the oxygen back into the atmosphere.
Both light-dependent and light-independent processes. As suggested by its name, the light-dependent reaction takes place inside the thylakoid membrane and requires a steady stream of sunlight.
Therefore, With a specific range of conditions is supported by the evidence is the correct option.
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mouth, pharynx, esophagus, stomach, _______ A) liver B) kidneys C) small intestine D) large intestine
If this question is asking for the direction that food goes, then the answer is D) Large intestine.
I do not understand I need help in doing the whole thing
Explain the difference between rotation and revolution?
Sample Response: Rotation occurs when an object spins about its own axis. Revolution occurs when one object moves around another object.
Some animals are able to survive long periods without food because they
They usually have a large store of fat.