Module 2 CARDIOLOGY

Question 1

Sinoatrial /SA node

Answer 1

-the origin of cardiac action potentials in a group of cells
- located in the right atrium of the heart

• is often referred to as intrinsic pacemaker activity or automaticity can be modulated by both parasympathetic and sympathetic neural input

Question 2

cells that spontaneously depolarize and fire action potentials at a regular rate

Answer 2

SA NODE CELLS:
-rate can vary between 60-100 times per min