When the Neuron Is at Rest, What Is Responsible for Moving

question 138

Multiple Choice

When the neuron is at rest, what is responsible for moving sodium ions out of the cell?

• A) a concentration gradient
• B) an electrical gradient
• C) both a concentration gradient and an electrical gradient
• D) the sodium-potassium pump

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Definitions:

Secretion

The process by which substances are produced and discharged from a cell, gland, or organ for a particular function in the organism or for excretion.

Terminal Cisternae

Enlarged areas of the sarcoplasmic reticulum around the myofibrils of muscle cells, involved in calcium ion storage.

T-tubules

Tubular extensions of the plasma membrane that penetrate into the center of skeletal and cardiac muscle cells, facilitating the transmission of electrical impulses.

Sarcolemma

The sarcolemma is the fine transparent tubular sheath that envelops the fibers of skeletal muscles.