An Autorhythmic Heart Cell Is One in Which

Multiple Choice

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.