19.2 Flashcards
what are the 3 factors in maintaining blood pressure
cardiac output
peripheral resistance
blood volume
how does the cadiovascular centre regulate blood pressure
by altering cardiac output and blood vessel diameter
what do baroreceptors detect and what do they do
pressure
send impulses to vasomotor centre inhibiting and promoting vasodilation of arterioles and veins
what do chemoreceptors detect
changes in CO2 to see how effective gas exchange is occuring in the body
what does Angiotensin II do
acts as a vasoconstrictor and promotes the release of aldosterone and antidiuretic hormone
what does atrialnatriuretic peptide do
act as a vasodilator and an antagonist to aldosterone
what does antidiuretic hormone do
promotes vasoconstriction and water conservation by the kidneys increasing blood pressure and volume
what is the difference between direc renal mechanism and indirect
direct - counteracts changes in blood pressure by altering blood volume through kidney filtration
indirect - counteracts the decline in arterial blood pressure by releasing aldosterone and antidiuretic hormone (triggering thirst and vasoconstriction)
whats hypertension
high blood pressure
whats hypotension
low blood pressure
what is circulatory shock
blood volume is inadequate and cannot circulate noramlly, blood cannot meet tissues needs
what is hypovolemic shock
large scale blood loss resulting in elevation of heart rate and intense vasoconstriction
what is transiet vascular shock
due to prolonged exposure to heat causes vasodilation of cutaneous blood vessels
what is cardiogenic shock
heart is to inefficient to sustain normal blood flow causing myocardial damage
what is tissue perfusion
sending blood through tissues in order to give nutrients to the tissues and take away wastes
