Which of the following is expected to increase in response to haemorrhage?
When hemorrhage occurs, there is no stimulation of aerial baroreceptors and so sympathetic output is increased leading to vasoconstriction and reflex tachycardia Increased secretion of Vasopressin and aldosterone also occurs in circulatory shock. Both these hormones cause retention of sodium and water thus increasing BP Vasoconstriction occurs mainly in skin and viscera diveing blood to vital organs. Blood vessels of the brain and hea are spared. Ref: Textbook of medical physiology by N Geetha, 2nd edition, page no. 184,185
Aeriolar dilation in skeletal muscle
Sympathetic activity
Sodium excretion
Water excretion
Cardiovascular system