A. Calculate her pulse pressure and mean arterial pressure (MAP) at rest after e
ID: 3475111 • Letter: A
Question
A. Calculate her pulse pressure and mean arterial pressure (MAP) at rest after exercise.
B. How did her pulse pressure and MAP change after exercise?
C. During exercise, why do you think there is a large increase in systolic pressure, but very little change in diastolic pressure? 10. A womans blood pressure at rest is 125/75. After 30 minutes of exercise, her blood pressure is 190/so. Calculate her pulse pressure and mean arterial pressure (MAP) at rest and after exercise. a. b. How did her pulse pressure and MAP change after exercise? c. During exercise, why do you think there is a large increase in systolic pressure, but very little change in diastolic pressure? EXERCISE 23 Cardiovascular Physiology
Explanation / Answer
A. Pulse pressure = Systolic pressure - diastolic pressure; mean arterial pressure = [Systolic pressure + 2(diastolic pressure)]/3
Therefore, at rest:
Pulse pressure = 125 - 75 = 50 mm Hg; mean arterial pressure = [125 + 2(75)]/3 = 91.67 mm Hg
Similarly, after exercise:
Pulse pressure = 190 - 80 = 110 mm Hg; mean arterial pressure = [190 + 2(80)]/3 = 116.67 mm Hg
B. Pulse pressure indicates the cardiac effort whereas MAP indicates the overall blood flow. Since exercise requires more cardiac effort and blood flow to meet the requirements of the skeletal muscles, both the pulse pressure and MAP got elevated during exercise.
C. As mentioned in answer to part B above, pulse pressure indicates the cardiac effort i.e. the force which the heart generates during each cycle of contraction (systole) and relaxation (diastole). Exercise increases the circulatory demand by the skeletal muscles and the heart needs to provide more blood to them; this is achieved by increase in pumping rate as well as increase in pumping pressure. Therefore, systolic pressure undergoes a large increase but very little change takes place in diastolic pressure.
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