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16 Cards in this Set
- Front
- Back
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What does the R Atrioventricular Valve do and what is it made of?
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-valve that controls blood flow from R atrium to R ventricle
-made of simple squamous cells -"tricuspid" valve |
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What are chordae tendineae and what does it do?
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-collagenous fibers
-opens and closes atrioventricular valve |
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What do papillary muscles do and what happens when it contracts?
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-anchors chordae tendineae
-valve closes when muscle contract |
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Where is the pulmonary semilunar valve located?
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-b/t pulmonary valve trunk and right ventricle
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What does the left atrioventricular valve do?
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-controls blood flow from left atrium to l ventricle
-"bicuspid" valve |
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Where is the aortic semilunar valve located?
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-b/t aorta and left ventricle
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What happens when ventricles are being filled with blood?
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-semilunar valves close
-AV valves open |
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Where does ventricular contraction begin and what happens?
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-at the apex
-AV valves close -semi lunar valves open |
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What are semilunar valves?
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-3 little cups in each valve
-open when ventricles contract -don't need tendineae |
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What happens when you ehar the lub part of a heart beat?
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-closing of the AV valves
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What happens when you hear the dub part of the heart beat?
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-closing shut of semilunar valves
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What are nodal tissue?
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-modified caridac muscle
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What is the sinoatrical node?
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-starts impulse
-known as the SA node or "pacemaker" |
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What is the atrioventricular node?
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-receives impulse from SA node
-guides impulses to interventricular septum -known as AV node |
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What is the atriventricular bundle?
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-carries impulse through itnerventricular septum
-splits into left and right bundles |
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What are parkinge fibers?
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-like little neurons
-carries impulses out to ind. caridac muscles cells |
