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All veins carry deoxygenated blood except

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Important Questions on Body Fluids and Circulation

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Oxygenated blood from left ventricle enters the aorta by opening of
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Origin of heart beat and its conduction is represented by -
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Rise in heartbeat, increase in the cardiac output and blood pressure occurs during emergency, by the release of which hormone?
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The decrease in the rate of heartbeat, speed of conduction of action potential, and thereby the cardiac output is under the control of:
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If we give an injection of acetylcholine to a person, the rate of the heartbeat will
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Parasympathetic nerve endings release_____, which decrease the rate of heartbeat and cardiac output.