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25 Cards in this Set
- Front
- Back
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order of bf
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left atria
left ventricle aorta arteries capillaries veins vena cavae right atria right ventricle pulmonary artery lungs pulmonary veins left atria |
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which quadrant has the thickest muscle
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left ventricle
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tricuspid valve
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b/t right atria and ventricle (3 flaps)
held by chordae tendonae to protect it from being blown open. these are held by the papilaary muscle |
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mitral valve
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b/t left atria and ventricle (2 flaps)
held by chordae tendonae to protect it from being blown open. these are held by the papilaary muscle |
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AV valves
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between ventricle and atria
mtiral tricuspid |
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SL valves
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semilunar valves.
aortic valve pulmary valve |
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number of flaps on aortic and pulmonary valve
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2
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fetal circulation
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hole is septum (foramen ovale) that lets blood flow directly from right to left atrium and bypassing the luings
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2 nodes
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SA and AV
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pacemaking cells
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rhymically send signals
SA and AV nodes |
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is SA or AV node faster
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SA
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route of electrical conduction through the heart
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SA node spreads through the atria causing it to contract. AV node slows down the signal, giving atria time to contract. Then the AV bundle splits into L and R bundles that spreak to Purkinje fibers in the ventricles which contract when the electrical signal gets to the tip
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vaugs nerve
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from medulla oblongata
is a parsympathetic nerve that stimulates heart and slows it down |
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EKG: P
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atrial depolarization
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EKG: QRS
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ventricular depolarization
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EKG: T
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ventricular repolarization
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resitng potential for normal nerve
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-70
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resting potential for pacemaking cells
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-60 (but doesn't really rest)
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thershold potential for normal nerve
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-55
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threshold potential for pacemaking cells
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-40
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how leaky membranes effect pacemaking cells
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as you get closer to -40, Ca gates open and Ca creeps in. When you get to -40, many more gates open
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does heart or nerve have a longer twitch?
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heart
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how does a longer twitch occur
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in heart muscle, there is a longer plateau from an influx of Ca that is the refractory period that prevents the heart from responding. plateau is for relaxing
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what is the purpose of the plateau
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prevents twitches from building up which is how you get a stronger force in normal muscle
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difference between nervous system and pacemaking&hear muscle cells
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the latter uses Ca
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