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26 Cards in this Set
- Front
- Back
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atria |
receiving chambers of the heart |
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ventricles |
pumping chambers of the heart |
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what are the 3 veins that send blood to the heart through the right atrium? |
superior vena cava, inferior vena cava, and coronary sinus |
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what veins send blood to the left atrium? |
pulmonary veins |
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trabeculae carneae |
mark the internal walls of the ventricles |
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papillary muscles |
in walls of the ventricles and play a role in valve function |
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right ventricle pumps blood to _______ |
pulmonary trunk |
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left ventricle pumps blood to _______ |
aorta |
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chordae tendineae |
"heart strings" that anchor the valve cusps to the papillary muscles |
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what circuit is the left side of the heart? |
systemic |
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what circuit is the right side of the heart? |
pulmonary |
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which ventricle has thicker walls and is a much better pump? |
left ventricle |
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coronary circulation |
functional blood supply of the heart
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large mitochondria account for how much of a cardiac cell? |
25-35% |
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what is the purpose of gap junctions in the cardiac muscle? |
they electrically tie all cardiac cells together into a single contractile unit |
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differences between skeletal and cardiac muscles? |
-means of stimulation -organ versus motor unit contraction -length of absolute refractory period |
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cardiac pacemaker cells have an ________ _________ ________ |
unstable resting potential |
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location where the heart's pacemaker is |
sinoatrial node |
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what is the heart's characteristic rhythm called? |
sinus rhythm |
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what are the locations for the flow of the pacemaker cell's in order from first to last location? |
sinoatrial node, atrioventricular node, atrioventricular bundle, right and left bundle branches, and subendocardial conducting network |
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normal heart rate is ?? |
75 beats per minute |
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where are the cardiac centers located in the brain? |
medulla oblongata |
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what role does the sympathetic nerve system have on the heart? |
"accelerator" increases both the rate and the force of heartbeat |
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what role does the parasympathetic nerve system have on the heart? |
"brakes" slows the heart |
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what are the 3 stages to an ECG? |
1) P wave 2) QRS complex 3) T wave |
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what is the normal adult blood volume? |
5 liters |
