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RideAnS [48]
4 years ago
7

Describes the type of muscle action that causes the heat to beat?

Biology
1 answer:
e-lub [12.9K]4 years ago
8 0

The atria and ventricles work together, alternately contracting and relaxing to pump blood through your heart. ... The electrical activity spreads through the walls of the atria and causes them to contract. This forces blood into the ventricles. The SA node sets the rate and rhythm of your heartbeat.

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