All are true about circulating changes in exercising muscle EXCEPT?
Correct Answer: Peripheral resistance increases
Description: Ans. D Peripheral resistance increasesRef: Ganongy 25th ed. pg. 549* Blood flow of resting skeletal muscle is low (2-4 ml/100 gm/min)* When the muscle contracts, it compresses the vessels and when it develops 70% of its maximal tension, blood is completely interrupted.* Between contractions the flow is increased by 30 times* This is due to dilatation of arterioles and precapillary sphincters cause of 10-100 times increase in open capillaries* During exercise there is a net fall in peripheral resistance, due to vasodilation in exercising muscles. Hence the SBP increases moderately and diastolic pressure remains unchanged or falls.
Category:
Physiology
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