The fatty tissue is called the Myelin sheath. The myelin sheath is a significantly extended and altered plasma membrane wrapped about the nerve axon in a spiral form. The myelin membranes somes from and are a part of the Schwann cells in the peripheral nervous system and the oligodendroglial cells in the central nervous system. Each myelin-spawning cell delivers myelin for only one segment of any given axon. The intermittent interruptions where short portions of the axon are left uncovered by myelin are the nodes of Ranvier, and they are critical to the functioning of myelin.
The myelin sheath, a fatty tissue produced by glial cells, covers axons and enhances the speed of impulses traveling between cells. The structure includes unmyelinated gaps or nodes of Ranvier, which promote rapid signal propagation. Damage to the myelin sheath can impair signal transmission and cause neurological disorders.
Explanation:The fatty tissue that covers axons and speeds up impulses as they travel from cell to cell is called the myelin sheath. This lipid-rich layer of insulation is formed by glial cells, specifically oligodendrocytes in the Central Nervous System (CNS) and Schwann cells in the Peripheral Nervous System (PNS). The role of this critical structure is to facilitate the transmission of electrical signals along the axon, thereby accelerating neural communication.
Part of how the myelin sheath improves signal speed is through its unique structure, which includes unmyelinated gaps known as nodes of Ranvier. These gaps allow for the quick rejuvenation and propagation of the electrical signal, a process known as 'saltatory conduction'. This arrangement ensures that the axon transmits nerve impulses faster, with less energy consumption, and is better protected from signal interference or 'cross talk' than an unmyelinated one.
The myelin sheath hence plays a crucial role in the proper functioning of the nervous system. Damage or degeneration of this insulation can impair signal transmission and can lead to neurological disorders.
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A particular gene in a population has two alleles, c and
c. if the allele frequency of c = 0.7, what is the frequency of c?
P+Q=1
0.7+ Q=1
for Q it will be .3
the allele frequency for other gene will be 0.3
The force driving simple diffusion is _____, while the energy source for active transport is _____.
a. the concentration gradient; atp
b. phosphorylated protein carriers; atp
c. the concentration gradient; adp
d. transmembrane pumps; electron transport and. atp; phosphorylated proteins.
Answer:
The answer is A. The force driving simple diffusion is the concentration gradient, while the energy source for active transport is ATP.
Explanation:
For simple diffusion, the movements of solutes and solvents depend on the electrochemical gradient. Usually, there are no difficulties for this kind of diffusion as they can pass freely through the semi-permeable membrane. This includes water, oxygen, carbon dioxide, etc. To demonstrate, we put a glass of water with sugar particles in it and a semi-permeable barrier in between, with the left side having MORE sugar. Equilibrium must always be attained in this kind of reaction. So the water (solvent) will pass through the membrane, right to left, from a higher concentration to lower concentration of water, to attain equilibrium. This doesn't require ATP or energy to occur.
For active transport, ATP will always be utilized to occur. An example would be the Na+/K+ pump. In order to maintain equilibrium, these ions are supposed to travel in and out of a cell. But moving from a low concentration to a high concentration area is difficult without a pump and ions are too big to pass through the semi-permeable membrane. So that's why they utilize this kind of transport.
The force driving simple diffusion is the concentration gradient, while the energy source for active transport is ATP.
Explanation:The force driving simple diffusion is the concentration gradient, this means that particles will move from an area of higher concentration to an area of lower concentration. On the other hand, active transport is a process that moves particles from an area of lower concentration to an area of higher concentration. This process is against the concentration gradient and requires an energy source. The main source of this energy is ATP (Adenosine Triphosphate), a molecule that stores and provides energy necessary for intracellular activities. Hence, the correct answer is (a) concentration gradient; ATP.
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Which subfield of anthropology traces the history of human evolution in fossils?
Which of these cells of the dermal tissue of plants prevent water loss and control gas exchange?
A.phloem cells
B.companion cells
C.parenchyma cells
D.guard cells
Prosocial emotions are associated with what part of the brain
Chao is thinking about doing a project on plate tectonics for the school science fair. Which design would best relate to how the movement in the Earth’s mantle is related to plate motion?
Answer:
a flat shallow pan filled with a thick liquid that can be heated by a hot plate with pieces of thin plastic sheets floating on top of the liquid.
Explanation:
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Which factors affect a population’s growth regardless of the population’s size?
density-dependent limiting factors
food and water availability
predator and parasite populations
density-independent limiting factors
Ans.
Population density defines number of individuals present in a particular area. Factors that affect the growth of a population, regardless the population size, are known as density-independent limiting factors as these factors limit the population growth, regardless the density of a population. These factors include climatic conditions, natural disasters, human activities, and sunlight.
Thus, the correct answer is 'option). density-independent limiting factors.'
How has the study of mitosis affected scientists’ knowledge of cancer?
It led to a study of how to induce cancer cells to divide more rapidly.
It led to an understanding of how cancer cells divide so rapidly.
It led to the development of contact-inhibition regulators.
It led to the discovery of how to prevent cancer cells from dividing.
The right answer is It led to an understanding of how cancer cells divide so rapidly.
A cancer (or malignant tumor) is a disease characterized by an abnormally large cell proliferation (tumor) in a normal tissue of the body, so that the survival of the latter is threatened.
Control points are programmed between each phase of the cell cycle to verify that the current process is proceeding normally.
This is an opportunity for the cell to identify the occurrence of possible abnormalities in its cell cycle and to trigger either an action of correction of these errors or its self-destruction (apoptosis).
If these errors are not repaired, they accumulate. It is this accumulation, over time, that is at the origin of cancer. It is considered that it takes about ten mutations for the phenomenon of cancerization to appear.
The anomalies that occur are genetic mutations, caused by errors during the replication - or reproduction - of the DNA, and therefore of the genes, when the cell divides.
In the majority of cases, these mutations occur on the DNA of a somatic cell of a particular tissue, for example, on the DNA of a colon cell.
It led to an understanding of how cancer cells divide so rapidly. Therefore, option (B) is correct.
Mitosis has helped scientists understand how cancer cells rapidly divide uncontrollably. Cancer is characterised by unregulated cell proliferation, which can result from mitosis disruption. Scientists have discovered cancer cell growth pathways and signalling networks by studying mitosis.
This understanding has helped discover cancer therapy targets and design medications that disrupt cancer cell division to reduce development and spread. Other choices may be relevant to cancer research, but they don't directly answer how mitotic research has changed cancer research. Therefore, option (B) is correct.
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Besides Antarctica which continent is made up almost entirely of desert
What did Fermi mean when he said, "The reaction is self-sustaining"?
How are the foods that we eat and atp related? how is atp used in organisms?
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Environmental differences within ecosystems are generally caused by _____.
abiotic factors
diverse vegetation
habitat destruction
the effects of animals
Answer: abiotic factors .
Explanation:
These abiotic factors are represented by climatic, edaphic (soil) and chemical conditions, which become the physical composition of the environment. So there are abiotic factors in terrestrial environments that are mainly light, temperature and water. And for the abiotic factors in aquatic environments are light, temperature and salinity. Therefore, for a species of a living being to inhabit a certain environment, it must adapt to the conditions that this environment proposes to it.
Abiotic Factors (Physical Environment) Climate factors: luminosity, temperature, atmospheric pressure, winds, humidity, and rainfall.
Chemical Factors: Relative amount of the various chemical elements present in water and soil.
The energy role of the first organism in a food chain is always a(n)______.
The energy role of the first organism in a food chain is always a producer.
What is the role of a producer in a food chain?Producers are crucial because they transform solar energy into chemical energy that other species can utilize.
The energy for the entire food chain is provided by producers, the initial level in a food system.
Producers are living things with the ability to grow their own nourishment. They frequently contain green vegetation. They use the process of photosynthesis to capture solar energy and use it to produce food. Since they are unable to create food on their own, all other creatures rely on producers for nourishment.
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Which might explain the asymmetrical part of the population pyramid?
How do energy conversions make a car go down the street?
A. The stored energy of the gasoline is converted to heat, and then to the stored energy of the car.
B. The kinetic energy of the gasoline is converted to heat, then to kinetic energy of the car.
C. The kinetic energy of the gasoline is converted to heat, then to potential energy of the car.
D. Potential energy is stored in gasoline, which is converted to heat, then to the kinetic energy of the car.
Main sequence stars can be classified according to which characteristics
Stars are classified based on the spectral type (i.e. a means to measure the photospheric temperature and density by getting information about the ionisation state).
Under the Morgan–Keenan (MK) system using the letters O, B, A, F, G, K, and M, a sequence from the hottest (O type) to the coolest (M type) (Harvard Spectral classification based on the surface temperature of the stars). A luminosity class is added to the spectral class using Roman numerals (Yerkes Spectral classification). This is based on the width of certain absorption lines in the star's spectrum (0 or Ia+ - hypergiants, I - supergiants, II - bright giants, III - regular giants, IV - sub-giants, V - main-sequence stars, sd - sub-dwarfs, and D - white dwarfs).
It is estimated that genetics account for about ___ percent of the inclination to begin smoking, and for about ___ percent of the ability to quit.
The principle difference between point source and nonpoint source water pollution is _______.
a.
whether the pollution is organic or inorganic
b.
the number of sources of pollution
c.
the amount of pollution
d.
whether it is from commercial or agricultural source
The correct answer is option B
The main difference between the point source and non point source is the number of sources that is involved in them.
The point source can be defined as the pollution having a single source by which the pollution is coming out.
Non point source can be defined as the pollution having more than one source of pollution which combinely can be defined as non point source.
During the second trimester, energy needs of pregnant women are ________ more kcalories per day than those of nonpregnant women.
Non examples of vacuole
a person who drives under the influence of alcohol or drugs
Answer:
Is termed as DUI and such people are not able to take right decision
Explanation:
DUI stands for operating a vehicle /Driving under the influence of alcohol or drugs. This denotes a situation where person has ingested alcohol than the legally acceptable alcohol quantity.
In such condition, the driver is unable to handle the vehicle and his perceptions and response become slow due to which he feels unable to take right decisions at the right time.
How does the cell membrane aid the cell in maintaining homeostasis?
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The cell membrane uses energy to remove waste products from the cell through sac-like packages.
The cell membrane extracts energy from food when the cell is low on energy.
The cell membrane controls all cellular activities in response to changes in the external environment.
The cell membrane assists with maintaining the correct temperature by absorbing energy.
The cell membrane controls all cellular activities in response to changes in the external environment. So the correct option is C.
What is the cell membrane?All cells have a cell membrane, also known as a plasma membrane, which divides the inside of the cell from the external environment. A semipermeable lipid bilayer makes up the cell membrane. The movement of materials into and out of the cell is controlled by the cell membrane.
A cell is protected by its cell membrane, also known as the plasma membrane. Additionally, it maintains a constant environment inside the cell, and that membrane serves a variety of purposes. One is to move compounds out of the cell that is harmful as well as nutrients into the cell. Another is that there will be proteins on the cell's membrane, which is its plasma membrane, that interact with other cells.
These proteins may be lipid proteins, which include both a protein and a fatty acid, or they may be glycoproteins, which contain both a protein and a sugar moiety. Similarly, those proteins that adhere beyond the plasma membrane enable cell-to-cell communication. Additionally, a cell's membrane offers some structural support.
Also, various cell kinds have different types of plasma membranes, and the lipid component of the plasma membrane generally contains a lot of cholesterol. This is distinct from a few other membranes found inside the cell. There are several plants and microorganisms, such as bacteria and algae, that have various defense systems.
Therefore the correct option is C.
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did any plants survive the eruption if so how did they survive
Plants can survive volcanic eruptions through various mechanisms such as quick regeneration from roots, fire-dependent seed germination, and the presence of resilient underground stems.
Plants can survive volcanic eruptions by various means:
Many plants can grow back quickly from the roots after burning to the ground.Some plants produce seeds that need fire to germinate.Many plants have thick underground stems that can survive fires.
PLEASE HURRY IM GOING CRAZYYYYBFSEFUSHFBSEUFSUFKSBSE
The diagram above shows the formation of a Hydra offspring from the parent. Both parent and offspring look exactly the same. This is an example of
A) fertilization.
B) genetic variation.
C) sexual reproduction.
D) asexual reproduction.
You are a pelican searching for fish in the ocean from high in the sky. although you see no tasty fish in the open ocean, you soon pass over a series of protected lagoons around an island. each lagoon contains lots of your favorite fish. as you begin descending into one lagoon, you notice that the fish are aggregated into several schools. some of these schools are close to each other, while others are far apart, and you cannot determine any consistent pattern in the distance between the schools. as you descend even closer to the water above a single school, you notice that each fish is approximately the same distance from each other fish. beginning from where you first saw the fish, describe, in order, what patterns of dispersion you noticed the fish exhibiting.
The pelican, has the eyesight of an eagle when fishing for food, as the bird flies closer to the school of fish. It sees the difference of the pattern by the scales that it sees and the reflective of the light of the sun. It catches the one that is easily catching up slowly to the school of fishes.
Which of the following does not accurately depict a scientific theory? A. Theories are tested over and over again. B. Theories are supported in many ways. C. Theories may be changed or replaced if new evidence is found. D. Theories are absolute truths.
D. Theories are absolute truths.
D. Theories are absolute truths.
Particles moving by saltation are transported in the _______ load.
The group of processes that transform sediments into rock is known as _____.
When the fetal head begins to crown during an emergency precipitous birth, how should the nurse respond?
Homo sapiens have 23 pairs of chromosomes what does this imply