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32 Cards in this Set
- Front
- Back
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what is systole
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ventricular contraction
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what is diastole
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ventricular relaxation
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what are the coverings of the heart
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pericardium (fibrous and serous)
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what are the layers of the heart
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epicardium, myocardium, endocardium
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R. heart is what type of circuit
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pulmonary circuit of O2 poor systemic blood
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L. heart is what type of circuit
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systemic circuit for O2 laden blood to provide functional supply for body
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describe the circulation of blood in the heart via workload, ect.
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equal volume but unequal workload. left. V has 5X more friction
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what is coronary circulation
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functional blood supply for heart
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what are atrioventricular valves
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bi and tricuspid, prevent blackflow into atria when vents. contract
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what is crucial to cardiac muscles to communicate and complete contractions?
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intercalated disc (gap junctions)
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how much mitochondria are in the heart
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25-35%
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how does the heart contract
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all or none
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what is the mechanisms/events of contraction
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automaticity-initiate own beat
rythmicity-regularity of pace-making |
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what is the do the sounds of the heart mean
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1st-AV close
2nd-SL shut |
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what is the length of the cardiac cycle and all its parts
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total lenght=.8s/atrial systole=.1s/ventrical systole=.3s/remaining .4s is total heart relaxation
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what is cardiac output
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amount of blood pumped out by each ventricle in 1 min
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What is the equation to find cardiac output
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CO=Heart rate X Stroke Volume
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What is stroke volume
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volume of blood pumped out by by one ventricle w/ each beat
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How do you find Stroke Volume (sv)
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sv=end diastolic volume (EDV) - end systolic volume(ESV)
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what are the normal 3 layers of a vessel wall
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tunica intima, tunica media, tunica externa
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describe the tunica intima
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contains endothelium
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describe the tunica media
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smooth muscle and sheets of elastin, regulated by sympathetic vasomotor nerves for vasoconstriction and vasodilation
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describe tunica externa
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loosely woven collagen fibers w/ nerves, veins ect.
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what are the 3 groups of the arterial system
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elastic, muscular, arterioles
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what/where are elastic arteries
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thick-walled arteries near heart (aorta and major branches), large lumen for low resistance
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what/where are muscular arteries
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deliver blood to specific organs, most of named arteries, thickest tunica media, most active in vasoconstriction
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describe arterioles
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smallest arteries lead into capillary beds, only single layer of smooth muscle cells
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describe capillaries
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only made of tunica intima, microscopic, exchange materials
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What is a vascular shunt in the capillaries
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metarteriole
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how much of total body blood are in the veins
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65%
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How do you find pulse pressure
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systolic pressure -diastolic pressure
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how do you find the MAP
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Map=DP + (PP/3)
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