Question

Explain how the Renin-Angiotensin-Aldosterone System (RAAS) reacts when there is a drop in blood pressure due to a decrease in blood volume. In your answer, make sure you provide details about how the hormone system affects the targets cells.

Answer 1

Answer : The renin angiotensin aldosterone system RAAS is a series of reactions mainly regulate blood pressure.

When blood pressure falls from normal range the kidneys release the enzyme renin into the bloodstream.Renin convert angiotensinogen into angiotensin I.Angiotensin 1 circulate into bloodstrem and reaches into the lungs where angiotensin converting  enzyme are found which convert angiotensin 1 into Angiotensin II, which is very active.

Now, Angiotensin II act as vasoconstricter that cause vasoconstriction result is increasing blood pressure.Angiotensin II also triggers the release of hormone aldosterone from the adrenal glands that increses the reabsoption of sodium salt and water result is increase blood volume and blood pressure.... Thanks dear student