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Tomtit [17]
2 years ago
9

During the repolarization phase of an action potential which of the following is the primary activity in the membrane of the pos

t-synaptic cell?
Biology
1 answer:
AysviL [449]2 years ago
3 0

During the repolarization phase of an action potential which of the following is the primary activity in the membrane of the post-synaptic cell?

A) Sodium ions are flowing out of the cell.

B) Sodium ions are flowing into the cell.

C) Potassium ions are flowing into the cell.

D) Potassium ions are flowing out of the cell.

Answer:

D) Potassium ions are flowing out of the cell.

Explanation:

The threshold opens both voltage-gated Na+ channels and the voltage-gated K+ channels. The voltage-gated K+ channels are very slow in opening. Therefore, they open when the voltage-gated Na+ channels are closing. The opened voltage-gated K+ channels are responsible for the repolarizing phase.

During this phase, the inflow of Na+ becomes less as the responsible channels are inactivated. The opened K+ channels allow the K+ to move out of the post-synaptic cell. It results in the generation of negative charge inside the cell membrane as the membrane potential reduces +30 mV to −70 mV.

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Considering that a hydrophilic stain was used to stain the skin, explain why the fat vacuoles in adipocytes are white (Hint: Rem
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Answer:

The hydrophilic nature of the stain explains that these molecules are polar and charge molecules. therefore, attracts the water molecule but due to their polar nature, it will avoid lipid or fat molecules.

Adipocytes are the cells that are made up of fat or lipids that are hydrophobic due to their non-polar nature and due to this fact, these hydrophilic stains will not be able to stain adipocytes and will not be colored by the stain.

8 0
2 years ago
The rate of a typical enzymatic reaction is increased by which of the following changes?A. Decrease substrate concentrationB. In
galben [10]

Answer:

D. Increase in temperature from 20 degrees C to 37 degree C

Explanation:

A decrease in substrate concentration might not necessarily lead to an increase in enzymatic activities.

Enzymes are pH specific. Thus increasing the pH of operation from 6.8 to 7.4 might destroy the enzyme.

Reactants need to overcome a minimum energy (activation energy) before they can be converted to products. The higher this energy, the lower the rate of reaction. Hence, increasing in activation energy will lead to a lower rate of enzymatic reaction.

<em>Enzymes work optimally at a temperature that is close to the human's body temperature which is 37.5 degrees. Hence, increasing temperature from 20 degrees to 37 degrees will result in an increased enzymatic activities.</em>

The correct option is D.

4 0
2 years ago
When the nervous system makes you feel hungry or thirsty, what body process is it helping to carry out?
kari74 [83]

Answer:

Homeostasis

Explanation:

6 0
2 years ago
An 80-meter sequoia tree is in the forest. What is most likely the age of the tree?
balandron [24]

Answer:

The correct answer is option D. "1,200 years".

Explanation:

The giant sequoia (<em>Sequoiadendron giganteum</em>) are the most massive trees in the world, and the tallest is one sequoia called "General Sherman" with a height of  83.8 m. "General Sherman" is estimated to be 2,000 years old, and is estimated that a sequoia tree can live up to 3,500 years. Therefore, an 80-meter sequoia tree in the forest most likely will have more than 1,000 years.

7 0
2 years ago
The Cretaceous-Tertiary extinction, the most famous of the Big Five, has been attributed to what major event(s) that triggered t
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This question has a two part answer. The first part is that an asteroid hitting the earth and the second part is massive volcanoes erupting around the world.

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2 years ago
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