The Heart Contracts Twice For Every Heartbeat.One Contraction Is The Atr…

the heart contracts twice for every heartbeat.One contraction is the atrial contraction while the other is the ventricular

Answer:

The heart contracts twice for every heartbeat. One contraction is the atrial contraction while the other is the ventricular contraction. … They are blood vessels that bring oxygenated blood from the left ventricle to the tissues of the lungs.

Explanation:

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