You are running late for physiology class, and instead of cutting through a yard

Question

You are running late for physiology class, and instead of cutting through a yard where there is a dangerous cat, you go the long way and run all the way to school. It is very hot and you sweat excessively and become dehydrated. You lose proportionately more water than salts.

a) What happens to your mean arterial pressure as a direct result of dehydration?

b) Will your heart rate be elevated or extra slow as a result of dehydration?

c) Will your stroke volume be elevated or lower than normal as a result of dehydration?

d) What happens to the osmolarity of your blood?

e) What hormone is released as direct response to this change in osmolarity?

f) On what region of the nephron does this hormone act?

Explanation / Answer

A) Reduction of body fluid (Dehydration) result in decreased mean arterial pressure

B) Reduction of blood pressure results in increased heart rate so that it maintain the normal circulation.

C) Dehydration results in reduction of stroke volume, because overall body fluid is reduced

D) There is loss of fluid and electrolytes in the plasma results in decreased osmolarity

E) ADH Anti diuretic hormone is released from Pituitary and it acts on kidneys in response to Dehydration

F) ADH acts in Distal convoluted tubules and collecting duct.

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