Question

name:

1. The part of the heart that initiates heart beat.

2. The structure that holds the heart valves in position.

thanks

Answer 1

1. The sinoatrial node (SAN) located in right auricle initiates heart beat.
2. The cuspid valves like bicuspid and tricuspid remain attached to the walls of ventricles by chordae tendineae. But pulmonary valves and aortic valves do not have this structures.