cardiac lab Flashcards
(32 cards)
where is cardiac muscle located?
in the heart wall and is responsible for involuntary contractions of heart chambers
atria
receive blood from great veins, thin walls small chambers
ventricles
pump blood to arteries, thick walls big chambers
semilunar valves
regulate blood flow between arteries and ventricles by pressure
ventricular pressure > arterial pressure, ventricles will pump blood into arteries
atrioventricular valves
atrial pressure > ventricular pressure, blood flows from atria to ventricles
endocardium
simple squamous CT
lines the heart wall and chambers
myocardium
cardiac muscle fibers, thick
muscles responsible for pumping action of the heart
epicardium
visceral pericardium
right side of the heart controls
pulmonary circulation, receiving
left side of the heart controls
systemic circulation, pumping
blood pressure
pressure that blood exerts on the heart walls during contractions
systolic vs diastolic
120/80
peak of ventricular ejections vs ventricular relaxation
rapid depolarization due to
influx of sodium, causing sodium channels to close
plateau due to
calcium influx hits highest point then plateaus, leaves opening for potassium leakage
repolarization due to
potassium leaves the cell and potassium channel will close (relative refractory period)
fibrillation
rapid uncoordinated heart contractions
average pulse
70-76 bpm
SA node
sinoatrial node, generates impulses (pacemaker)
right atrium
parasympathetic nerves releases________
which binds to _________. this results in
acetylcholine, M2 receptor in SA node
bradycardia
sympathetic nerves releases _______ which binds to __________. this results in
norepinephrine, B1 receptor on SA node
tachycardia
ECG
PQRST
P
atrial depolarization
Q
atrial repolarization
R
ventricle depolarization
