week 5 Flashcards
the circulatory system is what 2 systems
cv and resp
what does cardresp system do
move o2 and nutrients and reg body temp
what are the 2 adjustments of blood flow during exercise
increase cardiac output
redistribution of blood to muscles
the 4 parts of CVresp system
heart, arteries, arterioles, veins, venules and capillaries
what is the pulmonary circuit
right side of heart, oxygenates blood and returns it to the left side of heart
what is the systematic circuit
pumps oxygenated blood to rest of the body using arteries
wall components are made of smooth tissue - 4 examples
collagen, smooth muscle, elastin and endothelium
what 3 things does blood hold
ions, hormones and proteins
what cells carry hemoglobin
erythrocytes
what cells prevent clotting
platelets
what is a hematocrit
percentage of blood composed of erythrocytes
what makes up blood
plasma and hematocrit (42%)
how do you calculate plasma volume
hematocrit percentage x blood volume = x L
PLASMA = 5.5L - 2.3L = 3.2L
what is resistance
measure of hinderance to blood flow through a vessel
blood flow = change in pressure / resistance
links to whos law
darcys law
what is the change in pressure for darcys law
p1 - p2
resistance depends on what 3 things
length, viscosity and radius
how do you work out resistance
length x viscosity / radius ^4
what is the greatest influence on resistance
radius of vessel
how is total peripheral resistance calculated
MAP and CO
TPR X CO = MAP
what is local vascular resistance
R to blood flow in an organ or tissue calculated from pressure and organ/tissue flow
for a single vessel - turn ^4 into -4 - whos law
Poiseuille’s law
baroreceptors detect what
changes in arterial bp
muscle mechanoreceptors examples
muscle spindles, golgi tendon organs
muscle chemoreceptors
changes in chemical - h+ and CO2 and ph
central command theory states what
cv system drives come from a higher brain
fine tuned afferent feedback comes from where
heart and muscle mechanoreceptors and pressure sensitive receptors - baro
what is exercise pressor reflex
peripheral feedback to the medulla oblongata to amend the CV response to exercise
what is AV difference
amount of o2 in 100ml of blood
does av increase or decrease during exercise
increase
