Ion Channels | MCQs

Explanation

The ion primarily involved in initiating and regulating muscle contraction is calcium (Ca²⁺).

While magnesium (Mg²⁺) also plays a role in muscle relaxation and overall function,

Calcium is the key player in triggering the contraction process. 

Explanation

The sodium-potassium pump (Na⁺/K⁺-ATPase) actively transports 3 Na⁺ ions out of the cell and 2 K⁺ ions into the cell for each cycle,

For maintaining the electrochemical gradient

Explanation

During the repolarization of a neuron, potassium ions (K+) exit the cell.

This efflux of potassium ions along their electrochemical gradient causes the membrane potential

To become more negative, returning the neuron towards its resting state.