The left main coronary artery divides into the _____ branches. ...

[joesmith1212]

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]

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.

[joesmith1212]

TYSM

[rachel]

Thanks for the timely response, appreciate it