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Why has the left ventricle got the thickest walls?

If there's a higher pressure behind a valve, it's forced ....

The ________ cycle pumps blood around the body.

What is the name of the node that is in the right atrium that initiates the heartbeat?

Cardiac muslce is myogenic, what does this mean?

The SAN is like a pacemaker, it sets the rythm of the heartbeat by sending out regular...

On an electrocardiograph, the main peak of the heartbeat is called the...

xylem vessels transport...