A subject has a heart rate of 80 bpm and a systolic/diastolic blood pressure of
ID: 174743 • Letter: A
Question
A subject has a heart rate of 80 bpm and a systolic/diastolic blood pressure of 110/90. Assuming normal stroke volume (70 ml/beat), calculate the following: Cardiac Output: Mean Arterial Pressure: Total Peripheral Resistance: Rank the following conditions (from highest BP to lowest BP) in terms of the expected blood pressure: standing reclining immediately after exercise sitting Rank the following conditions (from highest TPR to lowest TPR) in terms of the expected total peripheral resistance: standing reclining immediately after exercise sitting Describe the mechanism that causes blood pressure to increase when the hand is immersed in ice water.Explanation / Answer
1.)Cardiac output(CO) = heart rate x stroke volume = 80bpm x 70ml/beat = 5.6 litre/min.
Mean Arterial pressure (MAP) =
MAP = [(2xdiastolic pressure) + systolic pressure]/3 = [(2x90)+110]/3 = 290/3=96.66 mmHg.
Total peripheral resistance(TPR)
MAP = (COxTPR) + Cental venous pressure(CVP).Since CVP is 0, hence TPR = MAP/CO=96.66/5.6
= 17.2mmHg.minL-1.
2.) Ranking of blood pressure from highest to lowest.
C immediately after exercise > standing > sitting > sleeping.
Just after exercise our body requires high amount of oxygen. In order to fulfill the demand heart pumps blood faster thus the blood pressure rises. While standing brain goes far from heart, hence the heart has to pump blood with more force in order to send the blood up there, hence there is rise in BP compared to sitting or recling posture.
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