An autorhythmic heart cell is one in which
A)action potentials fire spontaneoulsy.
B)action potentials are stimulated by internal stores of acetylcholine.
C)action potentials always occur at exactly the same frequency.
D)all filaments contract and relax with a high degree of synchrony.
E)action potentials are initiated by the autonomic nervous system.

Question

Quizplus · Accepted Answer

An autorhythmic heart cell is able to generate its own action potentials spontaneously without external stimulation. This is due to the presence of specialized ion channels that allow for an influx of sodium ions at a particular membrane potential, leading to depolarization and subsequent firing of an action potential. The process is known as automaticity or pacemaker activity.

An Autorhythmic Heart Cell Is One in Which