Author Question: The left main coronary artery divides into the _____ branches. a. marginal and circumflex b. ... (Read 84 times)

joesmith1212 · **on:** Jun 25, 2018

The left main coronary artery divides into the _____ branches.

a. marginal and circumflex
b. marginal and anterior descending
c. anterior and posterior descending
d. anterior descending and circumflex

Question 2

The intrinsic rate of the atrioventricular (AV) bundle is _____ beats/min.

a. 20 to 40
b. 40 to 60
c. 60 to 80
d. 80 to 100

qytan · **Reply #1 on:** Jun 25, 2018

Answer to Question 1

D
The left main coronary artery supplies oxygenated blood to its two primary branches: the left anterior descending (LAD) (also called the anterior interventricular) artery and the circumflex artery (CX).

Answer to Question 2

B
The AV bundle has pacemaker cells capable of firing at a rate of 40 to 60 beats/min.