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