What Happens When the Resting Nerve Is Stimulated to Threshold

question 49

Multiple Choice

What happens when the resting nerve is stimulated to threshold potential?

• A) The efflux of K⁺ restores the resting membrane potential.
• B) An action potential fires.
• C) The Na⁺/K⁺ pump further depolarizes the cell.
• D) The membrane permeability to Na⁺ decreases.

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Definitions:

Urinary Bladder

A hollow muscular organ that stores urine from the kidneys before it is disposed by urination.

Parasympathetic Effect

The impact of the parasympathetic nervous system, which promotes relaxation, digestion, and nutrient absorption, counterbalancing the sympathetic system.

Bronchioles

Small airways in the lungs that stem from the bronchi, leading to alveolar ducts and eventually to alveoli, where gas exchange occurs.

Urinary Bladder

A muscular sac in the pelvis, just above and behind the pubic bone, that stores urine before it is excreted from the body.