Action Potential

Question 1

What does phase 0 consist of?

Answer 1

-depolarization
-Rapid influx of positive charged sodium ions

Question 2

What does phase 1 Consist of?

Answer 2

-Brief repolarization
-potassium leaves the cell

Question 3

Phase 2 consists of?

Answer 3

-excitation contraction coupling
-influx of calcium into cells, causing contraction

Question 4

What does phase 3 consist of?

Answer 4

-early repolarization
-Sodium and calcium leave the cell
-potassium enters the cell

Question 5

What does phase 4 consist of?

Answer 5

-resting membrane potential
-Sodium and calcium remain outside of the cell
-potassium remains inside the cell

Question 6

During what phase does contraction occur?

A) phase 0
B) phase 1
C) phase 2
D) phase 3
E) phase 4

Answer 6

C) phase 2

Question 7

Cellular influx of which of the following ions results in contraction?

A) sodium
B) potassium
C) calcium
D) oxygen

Answer 7

C) calcium

Question 8

Depolarization means?

Answer 8

Heart cells become more positively charged and result in contraction

Question 9

What does repolarization mean?

Answer 9

Cardiac cells returned to their negatively charged. Leading to relaxation.

Question 10

What phase does excitation construction coupling belong to?

Answer 10

Phase 2

Question 11

What phase has early repolarization?

Answer 11

Phase 3

Question 12

What phase has resting membrane potential?

Answer 12

Phase 4