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ADH RAA Aldosterone

how blood pressure is maintained.

HintAnswer
blood pressure control blood pressure is controlled by vasoconstriction/vasodilation/baroreceptors and the RAA aldosterone negitive feedback loop
baroreceptors found in the arch of the aorta and the cartoid bodies
a drop in blood pressure is detected by the baroreceptors
the baroreceptors send a message to the cardiovascular centre in the brain (MEDULLA OBLONGATA)
these messages cause an increase in sympathetic activity causing the heart to speed up
heart speeds up vasoconstriction occurs and blood pressure will be raised
RAA &aldosterone (adh) RENIN ANGIOTENTIN ALDOSTERONE MECHANISM
decreased BP detected by the aterial pressure in the kidney
baroreceptors in the JGA juxtaglomerula apparatus in the kidney secrete renin into the blood
renin converts angiotensinogen to angiotentsin 1
angiotenstin 1 turns to angiotensin 2
this causes 2 things to happen vasoconstriction in the ateries of the kidney to maintain normal pressure in the kidney
and secondly angiotensin 2 stimulates the adrenal cortex to increase aldosterone secretion by the adrenal gland
= more sodium and therfore more water are reabsorbed into the blood
causing an increase in blood volume
therefore blood pressure will increase
ADH= anti duiretic hormone
reduced blood volume detected by osmoreceptors in the posterior pituritary gland
posterior pituritary releases an increased ammount of ADH
causing an increased permiability in the distal convoluted tubule in the kidney therefore blood volume will increase therefore blood pressure will increase.
Created by: 123christina
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