Question

When does the blood enter in atria. Choose the
correct answer :-
(a) during generation of impulse from SAN
(b) atrial relaxation
(c) as the tricuspid and bicuspid valves are open
(d) joint diastole
(1) a, b (2) a, b, c (3) b, c, d (4) all
Ocean​

Answer 1

Explanation:

The Answer is B

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Answer 2

The blood enter in atria during generation of impulse from SAN, artial relaxation and as the tricuspid and bicuspid valves are open.

Explanation:

The atrium is that the upper chamber through which blood enters the ventricles of the guts. There are two atria in the human heart – the left atrium receives blood from the pulmonary circulation, and the right atrium receives blood from the vena cava (venous circulation). The atria receive blood while it is relaxed, then contract to move blood to the atria. The atrium was formerly called the "auricle"; that term remains wont to describe this chamber in another animals, like the Mollusca.

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