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ECG p.74-92
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contraction 2 things
depolarization
systole
rest/relaxation 2 things
repolarization
diastole
decrease in oxygen due to decreased blood flow - 2
ischemia or
oxygen debt/lack
intense chest pain - 2
brief ischemia
aka angina
myocardial infarction (MI) - 2
severe ischemia
heart dies from hypoxia (no oxygen)
heart's 1st sound (lub) - 2 things
ventricular contraction/depolarization/systole
tricuspid & bicuspid valves closing
afterload=squeeze=resistance to ejecting blood
heart's 2nd sound - 2
ventricular relaxation/repolarization/diastole
pulmonic & aortic valves closing
preload=stretch=volume returning to the heart
volume of blood pumped out of 1 ventricle in a single beat/contraction
stroke volume
amount of blood pumped by the left ventricle in 1 minute
cardiac output
pressure in the ventricles at the end of a diastole
preload
end-diastolic pressure
resistance against which the heart much pump
afterload
2 things determine peripheral vascular resistance (PVR)
vasoconstriction
vasodilation
involuntary
not under conscious control
autonomic nervous system (ANS)
physical activity
fight or flight
innervates blood vessels
sympathetic nervous system (SNS)
rest and digest
parasympathetic nervous system (PNS)
my responsibility to make sure ____ ____ not used before doing a stress test
beta-blocker meds
generate the physical contraction of the myocardium
myocardial working cells
primary functions include both contraction & relaxation
myocardial working cells
do not contain contractile filaments
pacemaker cells
control the rate & rhythm of the heart by coordinating regular depolarization
pacemaker cells
point at which a stimulus will produce a cell response
threshold
GENERATE
own electrical impulses spontaneously w/o external stimulation
automaticity
RESPOND
TO
an electrical stimulus
excitability/irritability
RECEIVE & TRANSMIT
an electrical stimulus
conductivity
SHORTEN & EXTEND
in response to an electrical stimulus
contractility/rhythmicity
mechanical function of the heart
contractility
major function in cardiac depolarization & repolarization
potassium
K
K increase in blood
hyperkalemia
K deficit in blood
hypokalemia
vital part in depolarization of myocardium
sodium
Na
Na increase in blood
hypernatremia
Na deficit in blood
hyponatremia
important function in myocardial depolarization & myocardial contraction
calcium
Ca
Ca increase in blood
hypercalcemia
Ca deficit in blood
hypocalcemia
Author
PopeJim
ID
270781
Card Set
ECG p.74-92
Description
Coronary circulation, heart sounds, cardiac cycle, cardiac electrical information
Updated
4/16/2014, 9:57:51 PM
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