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Week 11 Quiz 9

Masterbooks Intro to A&P Volume 2

TermDefinition
cardiac conduction system Also known as instrinsic conduction system; has two "nodes" that set the pace of the heartbeat
SA node a small group of cells located in the upper portion of the right atrium's wall, near the entrance of the superior vena cava; the heart's main pacemaker
Purkinje fibers deliver the electric signals to their final destination; vital for maintaining the heart's smooth, coordinated pumping action
electrocardiogram the recording that is produced from the electrical impulses transmitted through the heart
cardiac output the amount of blood pumped by the heart in one minute
stroke volume the amount of blood pumped with each heartbeat
echocardiogram an ultrasound of the heart
diastolic volume the amount of blood in the ventricle when it is full
end systolic volume the amount of blood left in the ventricle after it contracts
vascular system a collection of tubes that carry blood away from the heart and then back again
arteries take blood away from the heart
veins carry blood back to the heart
capillaries connect the arteries and veins
arterioles the smallest arteries; they lead to the capillaries
venules the smallest veins; carry blood from the capillaries to the larger veins
endothelium lines all the blood vessels and the heart itself
scurvy a severe vitamin C deficiency
elastic arteries the arteries that are closest to the heart
adrenaline also called epinephrine; increases heart rate
vasoconstriction this is when the smooth muscle contracts and the lumen constricts