Blood enters into the heart because of muscles of _______ Options: A . &nbspatria relax B . &nbspventricles contract C . &nbspventricles relax D . &nbspatria contract

Blood enters into the heart because of muscles of ______

Question

Blood enters into the heart because of muscles of _______

Options:

A . atria relax

B . ventricles contract

C . ventricles relax

D . atria contract

Answer: Option A
Answer: (a).atria relax

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