Atterns In I S E A S E

The immediate counteracting response to hemorrhage is the arterial baroreceptor reflex, previously summarized in Figure 14-59.

Figure 14-61, which shows how five variables change over time when there is a decrease in blood volume, adds a further degree of clarification to Figure 14-59. The values of factors changed as a direct result of the hemorrhage—stroke volume, cardiac output, and mean arterial pressure—are restored by the baroreceptor reflex toward, but not to, normal. In contrast, values not altered directly by the hemorrhage but

ASCULAR P LT H AND D

Vander et al.: Human Physiology: The Mechanism of Body Function, Eighth Edition

Circulation CHAPTER FOURTEEN

Circulation CHAPTER FOURTEEN

Stroke volume

Heart rate Cardiac output (SV x HR)

Total peripheral resistance

Mean arterial pressure (CO x TPR)

Hemorrhage

Reflex compensations

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