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shtirl [24]
4 years ago
10

An inhibitory stimulus has occurred. B. Chemically gated potassium channels have opened. C. Excessive potassium has diffused out

causing hyperpolarization. D. Excessive depolarization of the axon has occurred.

Biology
1 answer:
andrezito [222]4 years ago
7 0

Given question is incomplete. Complete question has been attached.

Answer:

C. Excessive potassium has diffused out causing hyperpolarization.

Explanation:

The nerve action potential can be divided into following stages:

  • Stimulus is detected by the cell in resting stage.
  • Sodium channels in the membrane open from where influx of sodium ions occur which is called depolarization
  • After a while, sodium channels close and potassium channels open from where efflux of potassium ions occur which is called repolarization.
  • The membrane potential further lowers due to continous efflux of potassium ions which is called hyperpolarization.
  • After a while potassium channels close and membrane returns to its resting stage.

In the given figure, stage 4 depicts hyperpolarization because the membrane potential has dropped to the lowest point below -70mV. Hence, option C is correct.

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Answer:

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Explanation:

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5 0
3 years ago
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Gennadij [26K]

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5 0
1 year ago
The O allele is unusually frequent in the Americas. What does this pattern suggest about the evolutionary history of these popul
Lesechka [4]

Answer:

Populations from the Americas started from a founding population with a high frequency of the O allele

Explanation:

Human blood type is determined by three different codominant alleles: IA, IB, and, which are named A (IA), B (IB), and O (i). Each person has two blood type alleles, i.e., one allele inherited from the mother and one from the father. The frequency of the O blood allele is very high in indigenous populations, and in Central and South American populations this allele may reach a frequency of 1 (100%). In consequence, the predominance of the O blood allele in Native American populations suggests that these populations descended from a founding population that had a high frequency of the O blood allele. A founder effect may even cause the fixation of one allele within a population, and this phenomenon is known to be associated with the loss of genetic variation.

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3 years ago
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asambeis [7]

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Explanation:

Extremophiles are living organisms that are adapted to survive extreme environmental conditions such as high pH, high temperatures or high pressure.

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