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masha68 [24]
3 years ago
5

Which of the following is not a function of astrocytes?

Biology
1 answer:
VLD [36.1K]3 years ago
5 0

The correct answer is: E) provide the defense for the CNS

Astrocytes are star-shaped cells found in central nervous system (brain and spinal cord) .Some of their functions include:

• Support of neurons by supporting endothelilal cell of blood–brain barrier,

• Provide nutrients to neurons

• Maintain ion balance and thus controlchemical environment around neurons

• Repair of injuries in the brain

• the secretion or absorption of neural transmitters…

The cells that provide the defense for the CNS are called microglia. Those cells are also glial cells, derived from macrophages and thus, part of active immune defense.

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Describe the importance of the inner membranes separating different regions of the mitochondrion and the chloroplast.
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Answer:

The thylakoid membrane is responsible for separation of different regions of the mitochondrion and the chloroplast.

This membrane is responsible for the major difference between chloroplasts and mitochondria in terms of their structure and function.

The membrane is very important in chloroplasts and it fills the role of the inner mitochondrial membrane in electron transport and the chemiosmotic generation of ATP.

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The wind and water can break down the landscape and affect its physical formation. Water for example can break down rocks and make a ditch from 1 foot deep to 6 feet deep.

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Questions
Marat540 [252]

The decay of uranium isotopes is used to provide information about the age of Earth.

<h3>Explanation:</h3>

Isotopes of Uranium U-232, U-233 , U-234 , U-235 , U-236 , U-238 are used as fuel in nuclear reactors or as explosives for nuclear weapons. Uranium 238 is not very radioactive and it constitutes for nearly 99.3% of natural uranium on Earth and has the longest lifetime: its period is 4.5 billion years, about the age of Earth.

Use of radiometric dating techniques help in defining the age of substances (natural or man-made) using the known decay rates of radioactive elements. Each element has an  individual decay rate and half life time.

Two Uranium isotopes (U-238 and U-235) are used for radiometric dating. Both the isotopes have different decay rates and half life period. Both are unstable and radioactive. Since two different isotopes produce two different decay clocks (one as a reference to other), it is beneficial in accurately determining the age of samples. The age of earth (rocks or other natural elements) can be easily determined using Uranium isotopes.

4 0
3 years ago
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