Myocardial Electrophysiology

Question 1

Name the 2 main groups of cardiac myocytes.

Answer 1

1. Work cells (contractile cells)
2. Conduction cells

Question 2

Name the 2 main types of cardiac action potentials.

Answer 2

1. Fast response action potential
2. Slow response action potential

Question 3

Describe slow response action potential.

Answer 3

• Conduction velocity is slow.
• Exhibited by pacemaker cells in SA node and AV node
• These action potentials are responsible for initiating and maintaining rhythmic heartbeats without external stimuli.

Question 4

How many phases does fast action potential have?

Answer 4

5 phases in total.
- phase 4
- phase 0
- phase 1
- phase 2
- phase 3