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13 Cards in this Set
- Front
- Back
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At rest, how many liters of blood does an adult heart pump per minute?
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5 L/min
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What is the order of blood flow in the heart, starting with the right atrium?
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right atrium
right AV valve right ventricle pulmonary valve pulmonary vessels left atrium left AV valve left ventricle aortic valve aorta body superior/inferior vena cava right atrium |
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What is another name for the right AV valve?
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Tricuspid
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What is another name for the left AV valve?
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Mitral
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Which valves are semilunar?
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Pulmonary and aortic valve
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What are the three layers of the heart wall?
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1. Endocardium
2. Myocardium 3. Epicardium |
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What are the layers of the heart from inside to outside?
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endocardium, myocardium, epicardium
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Contractions of the heart are stimulated by what?
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electrical impulses
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What specialized system of nodal tissue in the heart generates and conducts impulses through the heart?
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Specialized Cardiac Muscle Cells
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What is the pacemaker of the heart?
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Sinoatrial node (SA node)
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What are the steps of the pacemaker process? (a-d)
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a. opening of funny channels - Na in; closure of outward K channels
b. opening of T-type Ca channels - Ca in - funny channels decrease. c. threshold reached - decrease in TCa channels, opening of L-Ca channels (long lasting channels) d. falling phase - opening of K channels |
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Where in the heart is there an impulse delay of about a tenth of a second?
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In the AV node
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How long is the delay of the impulse in the AV node?
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about a tenth of a second
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