Action Potential Curve Flashcards

1
Q

What happens in phase 0

A

cardiac cell RAPID DEPOLARIZATION

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2
Q

what enters and leaves in phase 0

A

Na+ enters and K+ leaves

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3
Q

Phase 0-1 is

A

RAPID REPOLARIZATION

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4
Q

what enters and leaves in phase 0-1

A

K+ reenters and Na+ leaves

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5
Q

Phase 2 aka

A

the plateau phase

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6
Q

In phase to what enters

A

ca+

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7
Q

in phase 2 ca+ enters causing

A

cell CONTRACTION

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8
Q

Ca+ causing cell contraction is the

A

excitation-contraction coupling mechanism

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9
Q

Phase 2 coincides with the

A

ST segment

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10
Q

Phase 3

A

final RAPID REPOLARIZATION

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11
Q

What enters and leaves during phase 3

A

Na+ and Ca+ are pumped out of the cell and K+ returns

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12
Q

Phase 4 AKA

A

resting phase

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13
Q

What enters and leaves in phase 4

A

Na+ and Ca+ remain outside the cell while K+ remains inside

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14
Q

During phase 1 and 2 : the cardiac cell will not respond to another stimulus no matter how strong

A

ABSOLUTE REFRACTORY PERIOD

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15
Q

during phase 2 and 3 the cardiac cell CAN be stimulated again but the stimulus must be stronger than usual

A

RELATIVE REFRACTORY PERIOD

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16
Q

phase four the cardiac cell can depolarize

A

resting (no movement) phase

17
Q

Normally ( blank) events briefly precede (blank) events

A

electrical, mechanical