Question

Cells use membranes to help maintain set ranges of ion concentrations inside and outside the cell. Which of the following ions is the most abundant inside a typical mammalian cell?

(a) Na+
(b) K+
(c) Ca₂₊
(d) Cl-

Answer 1

The most abundant ion inside a typical mammalian cell is potassium (K+), maintained through the active transport mechanisms of the sodium-potassium pump.

Step-by-step explanation:

The most abundant ion inside a typical mammalian cell is potassium (K+). Cell membranes are adept at maintaining concentration gradients of various ions, which is crucial for many cell functions, including the propagation of nerve impulses. The sodium-potassium pump actively transports Na+ out of the cell and K+ into the cell, maintaining a high internal concentration of K+ compared to the external environment. This gradient is vital for cellular processes such as electrical signaling in neurons.