Lecture 4 Flashcards
which term refers to the mechanism that describes the ability of a tissue to adjust its own blood supply through vasomotion or angiogenesis?
autoregulation
what is autoregulation?
ability of a tissue to adjust its own blood supply through vasomotion or angiogenesis?
what do vasoactive chemicals do?
what are 3 examples of vasoactive chemicals?
stimulate vasodilation
histamine, bradykinin, prostaglandin
what is angiogenesis?
growth of new blood vessels
what is hypercapnia?
excess of CO2 in blood
a general insufficient blood flow to a tissue is called ___
ischemia
what is the medullary ischemic reflex and what does it do?
monitors blood perfusion to brain
when perfusion to brain drops:
- vasoconstriction of arteries except those supplying the brain
- increased contractility force
- increased HR
what do vasoactive chemicals do?
stimulate vasomotion
what is vasomotion?
vasoconstriction or vasodilation
what does the hormone do?
angiotensin II
potent vasoconstrictor that raises BP
what does the hormone do?
aldosterone
promotes Na+ retention, which increases blood volume and raises BP
what does the hormone do?
natriuretic peptides
promotes Na+ excretion, which reduces blood volume and lowers BP
what does the hormone do?
antidiuretic hormone
increases BP by promoting water retention
acts as a vasoconstrictor at extremely high concentrations
excess of CO2 in blood is known as…
hypercapnia
By which process does the medulla oblongata monitor its own blood supply and activate corrective reflexes when it senses a state of ischemia?
medullary ischemic reflex