Read the following statements and choose the correct option.
Statement I Atria receive blood from all parts of the body which subsequently flows to ventricles.
Statement II Action potential generated at sino-atrial node passes from atria to ventricles.
(a) Action mentioned in statement I is dependent on action mentioned in Statement II
(b) Action mentioned in statement II is dependent on action mentioned in Statement I
(c) Action mentioned in statement I and II are independent of each other
(d) Action mentioned in statement I and II are synchronous.

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Solution

Option (d) Action mentioned in statement I and II are synchronous

The superior vena cava pours venous blood into right atria and left atria to receive blood from lungs. This then flows into ventricles. The contraction of muscles of atria arise from SA nodes and passes to AV node and then to the Purkinje fibres.
Therefore the action mentioned in statement I and Statement II are synchronous, while the other options are wrong.

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Q. Read the following statements and choose the correct option.
Statement 1: Atrial receives blood from all parts of the body which subsequently flows to ventricles.
Statement 2: Action potential generated at sino-atrial node passes from atria to ventricles.

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Statement 2: Action potential generated at sino-atrial node passes from atria to ventricles.

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