Increasing pressure on a Pacinian corpuscle opens gated ion channels, causing a receptor potential in the sensory neuron. This graded potential can lead to an action potential if the threshold is reached, which is then transmitted to the central nervous system.
Explanation:Understanding Pacinian Corpuscles and Nervous System Response
When increasing pressure is applied to the Pacinian corpuscle, a mechanoreceptor deep in the skin, changes occur in electrical activity within the receptor and the sensory neuron. Initially, the pressure deforms the corpuscle, causing mechanical pressure on the sensory neuron's dendrite. This mechanical stress opens gated ion channels, resulting in an influx of positive ions like sodium (Na+) into the neuron, thus changing the electrical potential of the neuron.
This alteration in electrical potential is known as a receptor potential, and it is a graded potential, meaning that its magnitude varies directly with the strength of the stimulus. With strong enough pressure, if the receptor potential reaches a certain threshold, this depolarization leads to the generation of an action potential. This action potential propagates along the sensory neuron, sending signals to the central nervous system that pressure has been applied.
Myelin sheaths around neurons facilitate the rapid conduction of these signals, ensuring effective response to the mechanical stimulus. This biological mechanism allows us to perceive variations in touch, pressure, and vibration through our sensory system.
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Explain how the experiments carried out by Van Helmont and Calvin contributed to our understanding of how nutrients cycle in the biosphere.
Water is a element that is continuously circulated in the biosphere. Van Helmont conducted an experiment on trees. He weighed a willow tree of 5 pounds and placed it in a earthern pot containing 200 pounds of soil. Over five years, he only added distilled water and rain water to the pot and weighed the tree showing a weight of 169 pounds and while the soil had lost few ounces of weight. This concluded that the tree grew up using water alone as he was unaware of photosynthesis.
Melvin Calvin discovered the important process of photosynthesis called the Calvin cycle or the light-independent reaction. In this cycle, the carbon atoms from the carbon dioxide are fixed and used to build the three carbon sugars in association with the ATP and NADPH produced in the light reaction of the photosynthesis. Thus, proving that photosynthesis is the source of nutrition to the plants and responsible for the growth of the plants.
blank is a combination of the genetic makeup and enviormental effects
Plants in grasslands would not benefit from adaptations that protect from gazing
It is false that plants in grasslands would not benefit from adaptations that protect from grazing.
What is grazing?To "graze" is basically to "feed on grass," as sheep, horses, as well as cows do in a meadow where they eat continuously but in small amounts.
In addition to eating little snacks all day long, people also occasionally graze.
In grasslands, grazing is a frequent hazard to plants, as well as many plant species have evolved defenses against herbivorous animals.
Many grassland plants have evolved to withstand the extreme environmental conditions that are typical of these environments, such as drought.
These adaptations may include deep roots that enable the plant to reach water that is located far below the surface or the capacity to go dormant during dry spells.
Thus, the given statement is false.
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What the medium for earthquake wave?
Activities that you perform each day require more muscle endurance than other muscular factors.
True
False
Answer: the answer is true
Explanation:
WILL UP VOTE
What is the role of the DNA polymerase in DNA replication?
A. It ties the chunks of DNA together.
B. It checks the DNA for errors.
C. It creates the replication fork.
D. It breaks apart the bases
The right ventricle pumps blood to the___ while the left ventricle pumps blood to the___ .
Answer: Lungs and body
Explanation:
The right ventricle pumps blood into the lungs as it is deoxygenated blood and it needs to be oxygenated before it is circulated inside the body.
The deoxygenated blood is oxygenated and then it is circulated so that every cell of the body gets oxygen.
The left ventricle from the lungs pumps blood to the aorta that is circulated to the body.
volume can be measured in liters or cubic meters true or false
Which type of animal has a lateral line system to detect vibrations in water?
amphibians
fish
whales
birds
Fish have a lateral line system which gives them the ability to detect small vibrations or currents.
If a cell continues to grow, the ratio of _ are to _ will continue to _
how would the cuticle and stomata work together to maintain the leaf's function
What natural methods removes carbon dioxide from the atmosphere?
Which sphere does a dolphin swim in?
A.
atmosphere
B.
lithosphere
C.
magnetosphere
D.
hydrosphere
How is E. coli like a paramecium
A both produce essential viatimins
B both are unicellular
C both have a contractive vacuole D both have a nucleoid
E. coli is like a paramecium because both are unicellular.
The following graph is representative of what type of population growth?
a.
logistic
b.
exponential
c.
linear
d.
triangular
The correct answer is Logistic growth.
In logistic growth the per capita growth of organism decreases as the population size increases and it is due to the limited resources in the environment. The limited resources in the graph is known as carrying capacity(k). Logistics curve always gives a S-shaped graph. The logistic graph depends on the size of the population. Large population will require more resources and less population will require less resources and more time to reach the carrying capacity of the curve. Mostly yeast growth shows this type of graph.
Answer:
Option a. Logistic
Explanation:
We will analyze every option one by one
a. Logistic graph
Logistic graph is a typical S-shaped graph showing three curves.
Starting curve shows a less growth because less number of species.
Then a steep curve showing fast growth because of good number of species then curve showing less growth because of limited resources in the environment.
This option is the correct option.
b. Exponential graph
Exponential graph shows a steep growth in its curve so this option doesn't match the graph.
c. Linear graph
Linear graph shows a straight line so this option is not correct.
d. Triangular
Triangular graph is a three dimensional graph having three vertices. So this option is again not correct.
Therefore Option a. Logistic graph is the correct one.
Which best describes reproduction?
Asexual reproduction may lead to an accumulation of mutations in the DNA.
Sexual reproduction allows for diploid gametes to combine to increase genetic variation.
Asexual reproduction leads to the formation of haploid gametes.
Sexual reproduction allows for more gametes to be formed than asexual reproduction does.
In the Arctic Ocean, there are very few large aquatic plants. Which of the following best explains why?
How does precipitation in a temperate forest compare, in general, to that in a tropical rainforest?
a. Currents are too strong for plants to survive.
b. Plants are unable to attach to the deep sea floor.
c. Plants have a difficult time surviving due to long periods of darkness.
d. Sea ice increases the salinity of the water to a level not suitable for plants. ...?
Answer:
c
Explanation:
dw its right
help please!
The approximate age of Earth is:
6,000 years
150,000 years
4.5 billion years
13.5 billion years
2.
On Aristotle's Scala Naturae, humans were:
on the bottom rung
on the top rung
on the same rung as animals
lower than plants
3.
Which of these ideas is not a central theory for modern biology?
evolution
creationism
cell theory
gene theory
Answer:
4.5 billion
On the top rung
creationism
Explanation:
If you look at this website then you will see that humans are on the top rung https://sites.google.com/site/aristotlethebiologist/aristotle-s-biology/great-chain-of-being
A specific mutation in a certain animal leads to abnormal development of the heart and kidney, resulting in miscarriage. Why did this happen?
Answer:
This most likely happened because "Nature kills the weaker organisms and selects only the strongest organisms, which can survive and flourish" although it should be clear that nature didn't cause this mutation, is "chose" not to select it
Explanation:
Quaggas once lived in South Africa. They are now extinct. People hunted them for their hides and meat. Quaggas fed on grass, which people also used to feed their sheep and goats.
Based on these facts, what is the LEAST LIKELY reason the quaggas became extinct?
A) Temperatures changed.
B) They had no food to eat.
C) They had no space to live.
D) People hunted them too much.
will upvote anyone who answers.
What evidence was used to support the early spherical model of Earth? Select all that apply.
The shadow seen crossing the moon during an eclipse is curved
When sailing in the ocean there is no edge to sail off of
A person in the North does not see the same stars as a person in the South
Earth is most likely a similar shape to astronomical bodies perceived outside the earth
Your Answers are B and C. I got my test on 100%
Which of the following statements about a compound is true?
A. The physical and chemical properties of a compound are usually very different from those of the elements from which it is formed.
B. Only the physical properties of a compound are usually the same as those of the elements from which it is formed.
C. Only the chemical properties of a compound are usually the same as those of the elements from which it is formed.
D. The physical and chemical properties of a compound are usually the same as those of the elements from which it is formed.
The following are true statements about a compound: The physical and chemical properties of a compound are usually very different from those of the elements from which it is formed and are present in Option A.
What are the properties of the compound?In general, the physical and chemical properties of a compound are different from those of the elements, and this is because of the arrangement of the atoms in the compound, for example, water has two atoms, such as hydrogen and oxygen, and the same two atoms are present in hydrogen peroxide, but these two have completely different arrangements and properties.
Hence, the following are true statements about a compound: The physical and chemical properties of a compound are usually very different from those of the elements from which it is formed and are present in Option A.
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Which statement is true about a cell?
A.
The smallest living things are cells.
B.
All known living things are made of multiple cells.
C.
Cells stop producing once adulthood is reached.
D.
Organs produce cells.
What is it called when scientists state whether their data confirmed or rejected the hypothesis?
A. Making a prediction
B. Drawing a conclusion
C. Stating a problem
D. Collecting data
3. Mitosis and meiosis are similar processes, but they have some very important differences. Explain how mitosis and meiosis are alike and how they are different. Provide at least two similarities and three differences
Answer:
His answer is perfect do not copy it directly or u will fail
Explanation:
Select all that apply.
The reactants of photosynthesis include _____.
glucose
solar energy
carbon dioxide
carbohydrates
water
chlorophyll
oxygen
Answer: solar energy, carbon dioxide, water, chlorophyll
Photosynthesis is a natural process through which plants prepare their own food by utilizing atmospheric carbon dioxide, water and sunlight. This process occur specifically in the leaves of the plants. The sunlight is trapped by the chlorophyll pigment present in the chloroplast organelle of the present in the leaves. The food produce in the form of glucose and oxygen is produced as a byproduct of this reaction.
What are mitochondria?
A mitochondria is like a powerhouse of a cell. They provide most of the cell's energy to do certain things.
explain the process of mitosis in a tissue culture for cancer cells
Answer and explanation;
-Mitosis is a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus, typical of ordinary tissue growth.
-In tissue culture, cancer cells are taken from a living organism and grown in a culture. Cancer cells grow at an uncontrolled rate. Cancer cells do not stop growing when they are touching; they continue growing. Cancer cells grow multiple layers thick. Cancer cell growth differs from normal cell growth and the number of mitotic divisions are unlimited.
-Producing three or more daughter cells instead of normal two is a mitotic error called tripolar mitosis or multipolar mitosis (direct cell triplication / multiplication). Other errors during mitosis can induce apoptosis (programmed cell death) or cause mutations. Certain types of cancer can arise from such mutations.
Answer:
Explanation:
Cancer cells are taken from a living organism and grown in a culture.
Cancer cells grow at an uncontrolled rate.
Cancer cells do not stop growing when they are touching; they continue growing.
Cancer cells grow multiple layers thick.
Cancer cell growth differs from normal cell growth and the number of mitotic divisions are unlimited.
What events caused the formation of most islands in the South Pacific?
Answer:
Volcanos
Explanation:
Sorry if I'm wrong
True or false: Migration doesn’t really affect population—it’s just a shifting of people from one place to another.
Migration significantly affects population sizes and can alter the genetic and demographic profiles of populations. It can be voluntary, involuntary, or forced, with diverse effects on the places people leave and the places they settle in.
Explanation:The statement 'Migration doesn’t really affect population—it’s just a shifting of people from one place to another' is false. Migration does affect population sizes and compositions in both the areas people leave (emigration) and the areas they settle in (immigration). Factors such as the distance and choice of migration, whether it is voluntary, involuntary, or forced, can have significant effects on the demographic and genetic profiles of populations.
Migration not only involves the geographic movement of people but also the movement of alleles or the genetic variation within a population, which can influence genotype frequencies. Through human history, migration has been a cornerstone in the shaping of civilizations, cultures, and the genetic diversity observed in modern populations. Hence, dismissing migration as merely a 'shifting' glosses over its profound impacts on population demographics, culture, and biological diversity.