Question

Describe how blood flow through the peripheral circulation is regulated during

a) Exercise

b) Hemorrhage How is the mean arterial pressure restored in each case? physiology

Answer 1

A ) During muscular exercise, the dilatation of the resistance vessels in the active muscles caused by unknown local factors provides for an increase in blood flow in proportion to the metabolic needs. The systemic blood pressure is maintained, despite the marked decrease in resistance in the active muscles, by appropriate reflex adaptations within the cardiovascular system. These are effected by the sympathetic adrenergic nerves. In this presentation, local vascular changes in the active muscles are described and compensatory changes that occur in other vascular beds discussed.

B.) there would be tachycardia and the would be decreased in blood volume, to restore that there is retention of fluids in the body and vasoconstriction takes place due to secretion of adrenaline.


During Excercise, the body needs more oxygen and glucose to perform the activity. after the certain levels baroreceptors located at carotid body and vessel of the aorta, there would be immediate vasodilation to restore mean arterial pressure.

To regulate Pressure in hemorrhage, body fluids are retained by releasing aldosterone and increasing heart rate.