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levacccp [35]
3 years ago
10

Give three functions of the cell surface membrane. (plasma membrane)

Biology
1 answer:
ad-work [718]3 years ago
4 0

I can help with one but not 3... The Cell membrane can be used to help protect the inner parts of the cell such as the, mitochondria, cytoplasm, endoplasmic reticulum. (List more).

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B) Plastic reduces the transfer of thermal energy two hands holding the utensil.

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3 years ago
During the course of an action potential, the membrane potential rapidly rises and reaches a peak of about +40 mV before falling
ad-work [718]

Answer:

A)  A decrease in Na+ permeability, and an increase in K+ permeability.

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When the potential action reaches a peak of about +40 mv Na+ channels are open and a high number of Na+ ions are entering the inside of the cell. Shortly after this happens the K+ channels will start to open their gates increasing the cell  K+ permeability  while the Na+ channels will start to close their gates, so the Na+ permeability will decrease. This happens  in order to valance the positive charge on the inside of the cell. Normally the inside has a negative charge while the outside has a positive one, as the inside is more positive due to the increase in Na+ permeability at the beginning of the potential action, K+ cations (which are in abundance in the cell) will have to go out through the K+ channels  so as to restore the charge valance, that means that there is an increase in K+ permeability.

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