WorksheetsCirculation (Blood Vessels)
Total questions: 19
Worksheet time: 12mins
what assists with venous blood return?
skeletal muscle pump
respiratory pump
valves
anastomses
peripheral resistance is...
distal ends of vessels
when aortic pressure is at it's lowest
impedance of blood flow by the force of friction between blood and BV
systolic pressure
factors that affect BP
veins
cardiac output
peripheral resistance
blood volume
what is TRUE about vasomotor center?
nuclei in medulla (controls diameter of BV's)
located in the carotid vessels
contains catecholamines
what is TRUE baroreceptor-initiated reflexes?
stimulates CIC
inhibits CAC
located in carotid sinus, aortic arch, and most elastic arteries
stimulates CAC
what is TRUE about chemoreceptor-initiated reflexes?
important in regulating respiratory rate and depth
located in carotid and aortic bodies
sensitive to arterial oxygen, CO2 and pH (increase H+)
decreases H+
how does the hypothalamus affect sympathetic stimulation?
takes oxygenated blood to all tissues
relaxes nervous system
causes redistribution of blood flow, due to exercise, body temp. and fight/flight response
causes skeletal muscle milking
catecholamines are
adrenal cortex hormones
epinephrine
norepinephrine
adrenal medulla hormones
where is ANP/ANF released from?
baroreceptors
released from endothelium
produced by the hypothalamus
atrial muscle fibers as a result of over-stretching due to increased BV
aldosterone
adrenal medulla hormone
released as a result of increase K+ and lowers Na+ blood levels
inhibited by ANP
released from endothelium
hepatic portal system
has the circle of willis
receives blood from placenta
runs from digestive tract, pancreas, spleen
deoxygenated blood flows from R. ventricle to lungs
the circle of willis
circulatory shock
high blood pressure
encircles the pituitary gland, allows an alternate route in case of occlusion
symptoms of light headedness
cardiogenic shock is due to
lymph dysfunction
extensive myocardial infarction
heart failure
prolonged cardiac arrythmia
neurogenic shock due to
severe pain, drug abuse, and hypoglycemia
nervous system injury to medulla
nervous system injury to hypothalamus
nervous system injury to pituitary
vasogenic shock
originates in nervous system
does not originate in nervous system
example anaphylactic shock
results in vasodilation and poor venous return
stages of pathophysiology of shock
overcompensated shock
compensated shock
progressive shock
decompensated (irreverisble) shock
what vessel has the greatest total cross sectional area?
capillaries
arteries
arterioles
venules
which hormones lower BP?
ANF
EDRF
Alcohol
ADH
which hormones increase BP?
ANF
adrenal medulla hormones
ADH
renin-angiotensin
