Cardiology

Question 1

Phase 0 of cardiac muscle cell

Answer 1

Rapid depolarization:

Sodium channels open causing sodium to pour into the cell

Question 2

Phase 1 of cardiac muscle cell

Answer 2

Potassium channels open
Sodium channels close
Potassium leaves cell

Question 3

Phase 2 of cardiac muscle cell

Answer 3

Calcium channels open
Potassium channels stay open
Equalizing into a plateau of action

Question 4

Phase 3 of cardiac muscle cell

Answer 4

Rapid repolarization

Caused by potassium channels staying open

Question 5

Phase 4 of cardiac muscle cell

Answer 5

Resting membrane potential or baseline

Open to potassium

Question 6

What is the space between phase 0 and 3 called?

Answer 6

Your effective refractory period or ERP