Tion 5.
In order to maintain homeostasis, human cells must have a higher concentration of sodium lons
outside the cell than inside the cell. In addition, the concentration of potassium ions must be
higher inside the cell than outside the cell. Which of the following forms of cellular
transportation helps human celis maintain a relatively constant sodium and potassium
concentration?
1 A.
a cell membrane pump
B. osmosis
c.
diffusion
UD. endocytosis
n6.

A cell membrane pump helps human cells to maintain a relatively constant sodium and potassium  concentration.

Option: A

Explanation:

Sodium potassium pump is a plasma membrane protein that utilizes energy ATP — Triphosphate Adenosine turning into ADP — Adenosine Diphosphate to deliver intracellular and extracellular sodium (NA+) and potassium (K+) ions sequentially. The purpose of this entire mechanism is to preserve cell equilibrium.

The extracellular medium has a greater concentration of Na while the K concentration of the intracellular fluid is lower. Proteins trap sodium ions in the cytoplasm and pump them out from the cells to preserve cell stability while preserving concentrations. Within the cells proteins inject potassium ions into the cell.