Cardiovascular Flashcards
What is flow
volume/time
What flow is the most effient
laminar
What is velocity
distance/time
What affect does surface area have on velocity
increased SA, decreased velosity
What is ohm’s law
flow = change in pressure/resistance
increasing resistance decreases flow
what is poiseulle’s law
flow = change in pressure x radius/ viscosity x length.
as blood flow decreases, viscosity increases
How do you calculate total peripheral resistance
TPR = (aortic pressure - right atrial pressure) / cardiac output
How do you calculate resistance of pulmary circuit
(pulmonary artery pressure - left atrial pressure) / cardiac output
What activates sweating
EP/norephin activate a1 receptors on sweat glands
how do you get cutaneous vasocontriction
posterior hypothalamic sympathetic stimulation
how do you get piloerection
sympathetic stimulation of arrector pili muscle
how do you get shivering
dorsomedial portion of posterior hypothalamus transmits signal to spinal cord
incrases skeletal muscle tone
What is a long term cold adaption
thyroxine secretion
thyroxine secretion
cold stimulates TRH from hypothalamus, TSH released, throxine released to increase cellular metabolism
How can symphathetic nervous system increase cellular metabolism
ox phos uncoupled to release heat instead of ATP
