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CV reading
Question | Answer |
---|---|
where does the blood that is low in oxygen and high in carbon dioxide enter the heart? | enters through the right atrium |
what is the valve called that passes through when it leaves the right atrium? | tricuspid vavle |
after blood becomes oxygenated in the lungs, what are the vessels called that return it to the heart? | pulmonary veins |
what chamber of the heart does oxygenated blood returning to? | left atrium |
where does the blood go after it leaves the left atrium? | left ventricle |
what is the name of the vessel that carries the oxygenated blood to the body? | aorta |
what are the first two branches of the aorta called ? | right and left coronary arteries |
what do the coronary arteries supply blood to? | tissue of the heart |
what supplies oxygen and nutrients to the myocardium if a coronary artery is blocked? | collateral circulation |
what is the enlarged vein that lies on the posterior surface of the heart? | cardiac veins |
what is it called when the atria contract? | systole |
what is it called when the ventricles contract? | diastole |
a complete heart beat is also known as? | cardiac cycle |
when pressure in the ventricles is low what valves open and allow the ventricles to fill with blood? | the A-V valve |
how much blood enters the ventricles before it contracts? | 70% |
what happens to the rest of the blood? | 30% of it is pushed into the ventricles |
what are the atria doing when the ventricles are contracting ? | they are relaxing |
what does the heartbeat heard through a stethoscope sound like? | lubb-dupp |
when does the first part of a heart sound occur? | during ventricular contraction |
when does the second part of the heart sound occur? | during ventricular relaxtion |
what is the mass of merging cells called that function as a unit ? | functional syncytium |
what two places in the heart contain this unit ? | atrial and ventricular syncytium |
what connects the atrial and ventricular syncytium | cardiac conduction system |