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|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?
|after blood becomes oxygenated in the lungs, what are the vessels called that return it to the heart?
|what chamber of the heart does oxygenated blood returning to?
|where does the blood go after it leaves the left atrium?
|what is the name of the vessel that carries the oxygenated blood to the body?
|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?
|what is the enlarged vein that lies on the posterior surface of the heart?
|what is it called when the atria contract?
|what is it called when the ventricles contract?
|a complete heart beat is also known as?
|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?
|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?
|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 ?
|what two places in the heart contain this unit ?
|atrial and ventricular syncytium
|what connects the atrial and ventricular syncytium
|cardiac conduction system