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19 Cards in this Set
- Front
- Back
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The force of blood ejected by the heart is determined primarily by the lenght of the fibers of its muscular wall
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Frank-Starling mechanism
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The more a cardiac muscle is stretched, the harder it will contract.
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Frank-Starling mechanism
(or law) |
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The resting phase, when nothing is flowing in or out of the cell, is refered to as
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Resting membrane potential
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Action potential resting phase
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phase 4
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depolarization occurs in what phase
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phase 0
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sodium NA+ rushes in as a result of sodium channels being activated by electrical impulse
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beginning of phase 0
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Sodium rushes in forcing K+ out of the cell causing the interior to become more positive than the exterior of the cell
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phase 0
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Sodium moves inside the cell
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phase 0
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sodium pumps out
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phase 1
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calcium moves in
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phase 2
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soidum ion pumps activate and soidum begins moving out and K+ back in
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Phase 1
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Na+ still being move out, K+ being pulled in and now Ca++ flowing into the cell
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Phase 2
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also called the plateu phase
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phase 2
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electrical charges remain relatively constant, creating a period of little change in electric gradient across the cell membrane
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phase 2
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calicium inside the cell binds with receptors, causing fibers of actin and myosin to pull together, effectively causing the cell to contract.
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phase 2
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calcium moves out
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Phase 3
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when enough ca++ has entered the cell changing the normal balace of electrical charges deactivating the Ca++ channel gates
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Phase 3 begins
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ion pumps move enough Na+ and Ca++ out to repoloarize the inside of the cell reseting it
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Phase 3
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repolarization of cell occurs in what phase
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Phase 3
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