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All of the muscle tissues of the heart do not contract at the same time. Different parts of the heart contract at different times. When the top portion contracts, the bottom part relaxes. When the bottom contracts, the top relaxes. When a chamber contracts, it becomes smaller and the blood inside gets squeezed or pumped out.​

All Of The Muscle Tissues Of The Heart Do Not Contract At The Same Time Different Parts Of The Heart Contract At Different Times When The Top Portion Contracts class=

Sagot :

Answer:

i answer for tdays video