Which of the Following Does Not Characterize Pacemaker Cells

Multiple Choice

Which of the following does not characterize pacemaker cells?

A) They are modified cardiac muscle cells.
B) Their action potentials rise rapidly.
C) They can initiate action potentials without stimulation from the nervous system.
D) They fire action potentials and stimulate neighboring cells to contract.
E) Their action potentials are broader than those of neurons.