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Week 11 Quiz 9
Masterbooks Intro to A&P Volume 2
Term | Definition |
---|---|
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 |