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the heart

test 1

heart 250-300 grams; located in the center of the thorax; all vessels, nerves, etc enter and leave the base (superior end)
mediastinum the heart, esophogus, and descending aorta
outer layer of heart epicardium, myocardium
inner layer of heart endocardium
myocardium cardiac muscle; intercalted discs; allow ions to jump from myocyte to myocyte
pericardium double layer; surrounds the heart
serous pericardium deep to the fibrous pericardium; visceral layer & parietal layer
visceral layer deep to the parietal layer; epicardium
parietal layer superficial to the visceral layer; attached to structures around it
pericardial cavity phospholipid lubricant to reduce friction around the heart
fibrous pericardium superficial to the serous pericardium
pressure gradient blood moves from high pressure to low pressure; only thing that moves blood
valves of the heart right atrioentricular valve; left atrioventricular valve; pulmonary valve; aortic valve; make sure blood flows in one direction
systole contraction of the heart
diastole relaxation of the heart
cardiac cycle one systole and one diastole
heart rate number of cardiac cycles per minute
stroke volume volume of blood ejected from a ventricle during a single systole; usually referring to the left ventricle
cardiac output volume of blood pumped by ventricle in one minute = (heart rate)(stroke volume)
cardiac index volume of blood pumped by a ventricle per minute per square meter of body surface = cardiac output/sq m of body surface
Created by: shill14