It is generally believed that a bit less than ________ of the cells are actual pacemaker cells.
A) 25%
B) 50%
C) 75%
D) 85%

Question

Quizplus · Accepted Answer

About 50% of the cells in the sinoatrial (SA) node are pacemaker cells, which are responsible for generating the electrical signals that initiate each heartbeat. The other 50% of cells in the SA node are specialized conducting cells that help to spread the electrical signal throughout the heart.

It Is Generally Believed That a Bit Less Than ________