BIO 305 EXAM 3 Questions with 100% Verified Answers
Latest Update
Question: microcirculation
Answer:
arterioles, capillaries, and venules
Question: circulation that supplies blood to all the body except to the lungs
Answer:
systemic circuit
Question:
Answer:
Question: pulmonary circuit
Answer:
carries blood to the lungs for gas exchange and returns it to the heart
Question: Poiseuille's equation
Answer:
-predicts volume flow rate in a cylindrical vessel
-only r really changes
Question: arteries
Answer:
-carry blood away from the heart
-strong, muscular layer
-do not present large resistance to flow
-little pressure drop until blood enters microcirculation
Question: arterioles
Answer:
-small vessels that receive blood from the arteries
-muscular, resistance vessels (present significant resistance to flow)
-major site of pressure regulation and loss
,-respond to nervous input, tissue demand, and other factors to modify R
-primary regulators of TPR
Question: resistance
Answer:
______ determines BP and blood flow in the arterioles
Question: TPR
Answer:
-total peripheral resistance
-resistance that the heart works against
-no BP change when constant
Question: BP
Answer:
determined by:
-blood volume (fluid intake/loss)
-cardiac output (HR and SV)
-resistance to blood flow (arteriole diameter)
-blood distribution between arteries and veins (vein diameter)
Question: R
Answer:
control of peripheral __ partly controlled by autonomic outflows: epinephrine (adrenal
medulla) and norepinephrine (symp. NS) can cause vasoconstriction or vasodilation of
arteriolar smooth muscle
Question: alpha
Answer:
___(alpha/beta)____ receptors cause vasoconstriction tissue examples: kidneys, digestive
system, skeletal muscle
Question: beta
Answer:
___(alpha/beta)____ receptors cause vasodilation tissue examples: lungs, heart
Question: alpha
Answer:
during fight or flight, you want to use ___(alpha/beta)____ receptors to dilate arterioles in
, skeletal muscle (local control -don't want BP to drop too much)
Question: local resistance
Answer:
-control of arteriolar contractility → vasodilation in response to flow mismatches
-can target one area to send blood to
-local control is possible everywhere but stronger in skeletal muscles
Question: baroreceptors
Answer:
-stretch receptors
-sensors in the homeostatic maintenance of MAP by constantly monitoring P in aortic arch
and carotid sinuses
-AP freq. is directly proportional to MAP (in a normal range)
Question: capillaries
Answer:
-thin-walled vessels where exchange takes place
-large network, large SA
-RBCs barely fit through
-slow flow allows lots of time for diffusion
-nutrients, waste, and fluid are exchanged across walls
Question: filtration
Answer:
fluid leaves a capillary
Question: absorption
Answer:
fluid enters a capillary
Question: NFP (net filtration pressure)
Answer:
= P(cap.) + π(if) - P(if) - π(cap.) if = interstitial fluid
-capillary exchange depends on balance of osmotic and hydrostatic pressures
-tells us the extent to which water will be pulled out
-high solute conc. inside of capillary
Question: absorption
Latest Update
Question: microcirculation
Answer:
arterioles, capillaries, and venules
Question: circulation that supplies blood to all the body except to the lungs
Answer:
systemic circuit
Question:
Answer:
Question: pulmonary circuit
Answer:
carries blood to the lungs for gas exchange and returns it to the heart
Question: Poiseuille's equation
Answer:
-predicts volume flow rate in a cylindrical vessel
-only r really changes
Question: arteries
Answer:
-carry blood away from the heart
-strong, muscular layer
-do not present large resistance to flow
-little pressure drop until blood enters microcirculation
Question: arterioles
Answer:
-small vessels that receive blood from the arteries
-muscular, resistance vessels (present significant resistance to flow)
-major site of pressure regulation and loss
,-respond to nervous input, tissue demand, and other factors to modify R
-primary regulators of TPR
Question: resistance
Answer:
______ determines BP and blood flow in the arterioles
Question: TPR
Answer:
-total peripheral resistance
-resistance that the heart works against
-no BP change when constant
Question: BP
Answer:
determined by:
-blood volume (fluid intake/loss)
-cardiac output (HR and SV)
-resistance to blood flow (arteriole diameter)
-blood distribution between arteries and veins (vein diameter)
Question: R
Answer:
control of peripheral __ partly controlled by autonomic outflows: epinephrine (adrenal
medulla) and norepinephrine (symp. NS) can cause vasoconstriction or vasodilation of
arteriolar smooth muscle
Question: alpha
Answer:
___(alpha/beta)____ receptors cause vasoconstriction tissue examples: kidneys, digestive
system, skeletal muscle
Question: beta
Answer:
___(alpha/beta)____ receptors cause vasodilation tissue examples: lungs, heart
Question: alpha
Answer:
during fight or flight, you want to use ___(alpha/beta)____ receptors to dilate arterioles in
, skeletal muscle (local control -don't want BP to drop too much)
Question: local resistance
Answer:
-control of arteriolar contractility → vasodilation in response to flow mismatches
-can target one area to send blood to
-local control is possible everywhere but stronger in skeletal muscles
Question: baroreceptors
Answer:
-stretch receptors
-sensors in the homeostatic maintenance of MAP by constantly monitoring P in aortic arch
and carotid sinuses
-AP freq. is directly proportional to MAP (in a normal range)
Question: capillaries
Answer:
-thin-walled vessels where exchange takes place
-large network, large SA
-RBCs barely fit through
-slow flow allows lots of time for diffusion
-nutrients, waste, and fluid are exchanged across walls
Question: filtration
Answer:
fluid leaves a capillary
Question: absorption
Answer:
fluid enters a capillary
Question: NFP (net filtration pressure)
Answer:
= P(cap.) + π(if) - P(if) - π(cap.) if = interstitial fluid
-capillary exchange depends on balance of osmotic and hydrostatic pressures
-tells us the extent to which water will be pulled out
-high solute conc. inside of capillary
Question: absorption
