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Control of Blood pressure (short term control (BARORECEPTORS (Rise in BP…
Control of Blood pressure
short term control
CHEMORECEPTORS
carotid and aortic bodies - primarily control respiration
O2 & CO2, pH - CVC - SNS stimulation
HIGHER CENTERS IN BRAIN
fear, anxiety, pain anger
BARORECEPTORS
Arch of aorta and carotid sinus
Rise in BP in arteries - input to Cardiovascular center
Increase PNS - slow down heart impair SNS - vasodilatation
drop in BP -
SNS stim - increase HR and vasoconstriction
Long term control
aimed at regulation of Na and water balance in the body and vasoconstriction by angiotensin II
ANTIDIURETIC HORMONE
secreted by posterior lobe of pituitary gland - increases H2O reabsorption by making distal convoluted tubules & collecting tubules in kidney more permeable
ATRIAL NATRIURETIC PEPTIDE
secreted by atria of heart - in response to stretched atrial wall
decreases reabsorption of sodium adn water from proximal convoluted tubules and collecting ducts
RAAS
Renin ezyme from nepron in response to SNS stimulation, low blood vol or low arterial BP
renin convert angiotensinogen from liver to angiotensin I, then ACE from lung converts it to Angiotensin II which is a vasoconstrictor
Presence of renin + increased K levels stimulate adrenal gland to secrete aldosterone
Aldosterone regulates sodium secretion - water is reabsorbed with sodium - blood volume is regulated