Can anyone explain this in more engineering terms? Biology can be difficult for me to read and to understand.
In: 2
I guess there’s two answers:
1) the heart actually beats because of a group of cells called pacemaker cells. They create electrical impulses by moving electrically charged atoms in and out of their cell membrane, which in turn triggers the nerves and muscles in the heart to contract and pump the blood.
2) the heartbeat that you *hear* in the stethoscope is caused by the valves in your heart opening and closing. They are also triggered and timed by the pacemaker cells.
Latest Answers