The effect is due to constriction of the venous capacitance vessels as well as contraction of the spleen. Sympathetic nervous system activity can change mean systemic pressure over the range of 5–18 mm Hg or more. The impact of changes in autonomic activity on venous return and cardiac function were described previously in Chapters 2 and 3. Reflexes Initiated By Baroreceptors and Other FactorsĬardiovascular responses to all challenges include participation of either or both components of the autonomic system.
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