The plateau phase of an action potential
A) occurs only in skeletal muscle and makes those fibers' contractions most forceful.
B) leads to tetanic contractions in smooth and skeletal muscle.
C) allows cardiac muscle cells to contract and then relax without locking up.
D) allows cardiac muscle cells to exhibit synchronous fibrillation.

Question

Quizplus · Accepted Answer

The plateau phase in cardiac muscle action potentials prolongs depolarization, allowing time for the heart muscle to contract and then relax, preventing tetanic contractions and ensuring proper heart function.

The Plateau Phase of an Action Potential