Question

A fall in ECF and K⁺ concentration would cause
A.Hyperpolarisation of the cell membrane.
B.Decreases in membrane potential.
C.Increase Na+current into the cell.
D.Stimulation of the electrogenic pump.

Answer 1

Hint:
One of the essential electrolytes within the body is potassium. It plays a crucial role in sustaining the cell’s membrane potential

Complete answer:
The cells can be depolarized and hyperpolarized by little changes in the extracellular concentration of potassium. As a result of this, cardiac function and other vital functions of the body are greatly impacted.
In the case of membrane potential becoming more positive, it leads to depolarization while hyperpolarization is the reverse of depolarization. Hyperpolarization is the phenomenon when the membrane potential becomes more negative.
The internal balance of K⁺ is maintained by the flow of intercellular fluid and extracellular fluid.Na⁺ and K⁺ ATPase be in charge of controlling potassium movement in and out of the cells. A higher concentration of extracellular fluid promotes the movement of K⁺ into the cells, down its concentration gradient While a low concentration of ECF K⁺ promotes the movement of K⁺ out of cells, down its concentration gradient. There is more K⁺ exit taking place and the interior becomes more negative. That is the reason the membrane becomes hyperpolarised.
Hence the correct answer is option A. Hyperpolarisation of the cell membrane. .

Option ‘A’ is correct

Note:
Cardiac function is also affected due to the chemical gradient of K⁺ being increased. This causes membrane hyperpolarisation.