NURS 2410 Exam 3 Questions with 100% Correct
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Terms in this set (317)
5 parts to the conduction system: 1. SA node (location: wall of RA)
-then spread down atrial conduction pathways
2. AV node (location: RA near septum)
-slight delay in conduction to allow for complete
ventricular filling
3. Bundle of HIS
4. L and R bundle branches
5. Purkinje fibers
relaxation of myocardium required diastole
for filling chambers
contraction of myocardium proves systole
increase in pressure to eject blood
describe the cardiac cycle: atria relaxed, filling with blood --> AV valves
open --> blood flows into ventricles --> atria
contract, remaining blood forced into ventricles -
-> atria relax --> ventricles contract --> AV valves
close --> semilunar valves open --> blood into
aorta and pulmonary artery --> ventricles relax
,Describe "lubb-dubb" sounds and 'lubb; = 1st sound; closure of AV values
murmurs
'dubb' = 2nd sound; closure of semilunar valves
murmurs: 3rd and 4th sounds; caused by
incompetent valves; "whoosh" sound due to
turbulent blood flow through damaged vessels
describe bruit similar to murmurs; a "whoosh" heard over blood
vessels
what controls the rate and force of cardiac control center in medulla oblongata
contractions?
function of baroreceptors and baroreceptors: detect changes in BP; located in
chemoreceptors aorta and internal carotid arteries; stimulates
SNS/PNS to change HR or FOC
chemoreceptors: detect chemical changes
associated with CO2
blood ejected by a ventricle in one cardiac output --> directly related to BP
minute
cardiac output formula: CO = SV x HR
volume of blood pumped out of stroke volume
ventricle - contraction
amount of blood delivered to heart preload
by venous return (right side)
force required to eject blood from afterload --> determined by peripheral resistance
ventricles in arteries
, Resistance left ventricle must peripheral resistance
overcome to circulate blood into
aorta
exerted when blood is ejected from systolic pressure
ventricles (high)
sustained pressure when ventricles diastolic pressure
relax (lower)
what is BP altered by? cardiac output
blood volume
peripheral resistance to blood flow
lateral force blood exerts on walls blood pressure
of arteries
what factors affect peripheral venous return
resistance? blood viscosity
blood vessel length
obstructions in vessels
what factors affect cardiac output? stroke volume
heart rate
what factors affect blood volume? water loss
water gain
Answers | Verified | Updated (Actual Exam)
Save
Terms in this set (317)
5 parts to the conduction system: 1. SA node (location: wall of RA)
-then spread down atrial conduction pathways
2. AV node (location: RA near septum)
-slight delay in conduction to allow for complete
ventricular filling
3. Bundle of HIS
4. L and R bundle branches
5. Purkinje fibers
relaxation of myocardium required diastole
for filling chambers
contraction of myocardium proves systole
increase in pressure to eject blood
describe the cardiac cycle: atria relaxed, filling with blood --> AV valves
open --> blood flows into ventricles --> atria
contract, remaining blood forced into ventricles -
-> atria relax --> ventricles contract --> AV valves
close --> semilunar valves open --> blood into
aorta and pulmonary artery --> ventricles relax
,Describe "lubb-dubb" sounds and 'lubb; = 1st sound; closure of AV values
murmurs
'dubb' = 2nd sound; closure of semilunar valves
murmurs: 3rd and 4th sounds; caused by
incompetent valves; "whoosh" sound due to
turbulent blood flow through damaged vessels
describe bruit similar to murmurs; a "whoosh" heard over blood
vessels
what controls the rate and force of cardiac control center in medulla oblongata
contractions?
function of baroreceptors and baroreceptors: detect changes in BP; located in
chemoreceptors aorta and internal carotid arteries; stimulates
SNS/PNS to change HR or FOC
chemoreceptors: detect chemical changes
associated with CO2
blood ejected by a ventricle in one cardiac output --> directly related to BP
minute
cardiac output formula: CO = SV x HR
volume of blood pumped out of stroke volume
ventricle - contraction
amount of blood delivered to heart preload
by venous return (right side)
force required to eject blood from afterload --> determined by peripheral resistance
ventricles in arteries
, Resistance left ventricle must peripheral resistance
overcome to circulate blood into
aorta
exerted when blood is ejected from systolic pressure
ventricles (high)
sustained pressure when ventricles diastolic pressure
relax (lower)
what is BP altered by? cardiac output
blood volume
peripheral resistance to blood flow
lateral force blood exerts on walls blood pressure
of arteries
what factors affect peripheral venous return
resistance? blood viscosity
blood vessel length
obstructions in vessels
what factors affect cardiac output? stroke volume
heart rate
what factors affect blood volume? water loss
water gain
