The given graph shows pressure changes in the left side of the heart during a single heart beat.
Between points W and X, which of the following valves are open or closed respectively?

Atrio - ventricular valves - Closed, Semilunar valves - Closed

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Atrio - ventricular valves - Closed, Semilunar valves - Open

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Atrio - ventricular valves - Open, Semilunar valves - Open

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Atrio - ventricular valves - Open, Semilunar valves - closed

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Solution

The correct option is B Atrio - ventricular valves - Closed, Semilunar valves - Open
In the given figure, between the points W and X ventricular contraction is observed. This means that the atrioventricular valves would be closed and the semilunar valves would be open.
So, the correct answer is 'Atrio - ventricular valves - Closed, Semilunar valves - Open'.

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