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NEET Biology question

BiologyBody Fluids and CirculationNEET

Which of the statement is correct? I. The closing and opening of the heart is through the valves during each heart beat II. The movement of the impulse passes from the SA node to all the regions of the heart wall III. The number of the times the heart beats in one minute is 60 IV. Change in the blood volume in all the chambers of the heart occurs during the cardiac cycle The option with correct statements is

Answer: (B)

Solution

The SA node's impulse does spread to all regions of the heart wall (II is true), the chamber volumes do change through the cardiac cycle as the chambers fill and empty (IV is true), and the source accepts an average heart rate of about 60 beats per minute for this statement

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Question ID VK-116169