What is the primary function of the Na+/K+-ATPase pump?

Study for the Paramedic Aandamp;P Exam. Engage with flashcards and multiple choice questions, complete with hints and explanations. Prepare effectively for your exam!

Multiple Choice

What is the primary function of the Na+/K+-ATPase pump?

Explanation:
Maintaining intracellular K+ and extracellular Na+ gradients is the key role. The Na+/K+-ATPase uses one molecule of ATP to pump 3 Na+ ions out of the cell and 2 K+ ions into the cell. This activity keeps Na+ concentrations higher outside and K+ concentrations higher inside, creating the electrochemical gradients that underlie the resting membrane potential. The resting potential is largely set by K+ leak channels, and keeping the gradients intact allows neurons and muscle cells to rapidly respond to stimuli when voltage-gated channels open. This pump also helps regulate cell volume by controlling osmotic balance, since ion gradients drive water movement. It does not directly generate action potentials—that comes from voltage-gated ion channels responding to the gradients the pump maintains. It does not move calcium into the sarcoplasmic reticulum (that’s a different transporter, SERCA), and it does not synthesize ATP (the pump consumes ATP to function).

Maintaining intracellular K+ and extracellular Na+ gradients is the key role. The Na+/K+-ATPase uses one molecule of ATP to pump 3 Na+ ions out of the cell and 2 K+ ions into the cell. This activity keeps Na+ concentrations higher outside and K+ concentrations higher inside, creating the electrochemical gradients that underlie the resting membrane potential. The resting potential is largely set by K+ leak channels, and keeping the gradients intact allows neurons and muscle cells to rapidly respond to stimuli when voltage-gated channels open.

This pump also helps regulate cell volume by controlling osmotic balance, since ion gradients drive water movement. It does not directly generate action potentials—that comes from voltage-gated ion channels responding to the gradients the pump maintains. It does not move calcium into the sarcoplasmic reticulum (that’s a different transporter, SERCA), and it does not synthesize ATP (the pump consumes ATP to function).

More practice questions