Action Potential Curve

Question 1

What happens in phase 0

Answer 1

cardiac cell RAPID DEPOLARIZATION

Question 2

what enters and leaves in phase 0

Answer 2

Na+ enters and K+ leaves

Question 3

Phase 0-1 is

Answer 3

RAPID REPOLARIZATION

Question 4

what enters and leaves in phase 0-1

Answer 4

K+ reenters and Na+ leaves

Question 5

Phase 2 aka

Answer 5

the plateau phase

Question 6

In phase to what enters

Answer 6

ca+

Question 7

in phase 2 ca+ enters causing

Answer 7

cell CONTRACTION

Question 8

Ca+ causing cell contraction is the

Answer 8

excitation-contraction coupling mechanism

Question 9

Phase 2 coincides with the

Answer 9

ST segment

Question 10

Phase 3

Answer 10

final RAPID REPOLARIZATION

Question 11

What enters and leaves during phase 3

Answer 11

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

Question 12

Phase 4 AKA

Answer 12

resting phase

Question 13

What enters and leaves in phase 4

Answer 13

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

Question 14

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

Answer 14

ABSOLUTE REFRACTORY PERIOD

Question 15

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

Answer 15

RELATIVE REFRACTORY PERIOD

Question 16

phase four the cardiac cell can depolarize

Answer 16

resting (no movement) phase

Question 17

Normally ( blank) events briefly precede (blank) events

Answer 17

electrical, mechanical