Questions and Answers
What is the primary mechanism by which the athlete's blood pressure increased during exercise?
Increased sympathetic tone
Which of the following best explains the decrease in diastolic pressure during exercise?
Decreased peripheral resistance
What is the primary stimulus for the increased sympathetic tone during exercise?
Increased lactic acid levels
What is the effect of the increased sympathetic tone on the heart during exercise?
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Which of the following is a secondary effect of the increased sympathetic tone during exercise?
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Study Notes
Blood Pressure Regulation during Exercise
- At rest, the athlete's blood pressure is 115/78 mm Hg, which is a normal blood pressure reading.
- After 30 seconds of running, the athlete's blood pressure changes to 130/67 mm Hg, indicating an increase in systolic pressure and a decrease in diastolic pressure.
- The physiological mechanism that initiated this response is the sympathetic nervous system (SNS) activation.
- The SNS stimulates the heart to increase its contraction force and rate, resulting in increased cardiac output and elevated systolic blood pressure.
- The SNS also causes vasodilation (widening) of blood vessels, leading to decreased peripheral resistance and a subsequent decrease in diastolic blood pressure.
- This response is necessary to meet the increased oxygen demands of the muscles during exercise.
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Description
This quiz assesses your understanding of the physiological mechanism that initiates a response to exercise, specifically the changes in blood pressure during physical activity. Identify the mechanism and explain how it causes the response.
