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3 years ago

At rest, a cell membrane is said to be ___________.

Biology

1 answer:

max2010maxim [7]3 years ago

7 0

Answer:

a. polarized

Explanation:

The whole living cell and in particular the nerve cells show electric potential difference between the inner and outer faces of their cell membrane.

The resting potential of a cell refers to the difference in electrical potential that the inner and outer faces in the membrane of a neuron that is not transmitting nerve impulses. The resting potential value is around -70mV (milliVolts). The negative sign indicates that the interior of the cell is negative relative to the exterior.

The existence of the resting potential is mainly due to the difference in concentration of sodium (Na +) and potassium (K +) ions inside and outside the cell. This difference is maintained by a mechanism of active ion pumping through cell membranes, in which sodium is forced out of the cell and potassium in.

At rest, the alternation between passive and active ion transport occurs. There is passive input of sodium (Na +) ions, which are subsequently actively expelled, while potassium (K +) ions enter actively. Then K + passes passively from the cell, making the external medium positive relative to the internal medium. With this, the cell becomes polarized.

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Scorpion4ik [409]

Answer:

1. a

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Explanation:

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2 years ago

Provide thorough details of how human population, interplanar, and extraplanar conditions contribute to global climate change.

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Answer:

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ryuvrajsingh1298 ....

Explanation:

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How does low body temperature affect the blood's ability to carry dissolved oxygen

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3 years ago

Mom is A+. She has 2 children, one is O+ and the other is B-. (Note: Rh+ is RR or Rr, and Rh- is rr) What are the father’s possi

mezya [45]

Answer:

The blood group of the father must be B.
The genotype of blood group would be $I^{B}i$ .
The Rh factor of the father can either be positive or negative.
Thus, the genotype of Rh factor of father would be either Rr or rr.

Rh factor:

The phenotype of the mother Rh factor is positive. Thus, she can have Rr or RR as her genotype as positive is a dominant trait.

If the genotype of the mother is RR then all the offspring would be positive for Rh factor. However, one of the offspring is Rh negative, that means the mother must be heterozygous that is, Rr.

The genotype of the father can either be Rr or rr in order to produce offspring with positive as well as negative Rh.

Blood group:

The blood group of the mother is A. Thus, the genotype can either be $I^{A}I^{A}$ or $I^{A}i$ .

However, the blood groups of the children are O+ and B+.

Thus, the genotype of the mother must be heterozygous that is $I^{A}i$ .

The blood group of the father must be B with genotype $I^{B}i$ in order to produce offspring with blood group O and B.

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2 years ago

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