Most of the bundle branch tissue is supplied by the _____ ...

[mrsjacobs44]

Most of the bundle branch tissue is supplied by the _____ coronary artery.
 
  a. right
  b. left

Question 2

In third-degree AV block, _____.
 
  a. the atrial rhythm (P-P interval) is irregular
  b. the ventricular rhythm (R-R interval) is irregular
  c. there is no PR interval because the atria and ventricles beat independently of each other
  d. the PR interval after a nonconducted P wave is shorter than the interval preceding the nonconducted beat

[Beatricemm]

Answer to Question 1

B
Most of the bundle branch tissue is supplied by a branch of the left coronary artery.

Answer to Question 2

C
In third-degree atrioventricular (AV) block, both the atrial and ventricular rhythms are regular, but the atria and ventricles beat independently; therefore the P waves that are present are unrelated to the QRS complexes (i.e., AV dissociation exists).

[mrsjacobs44]

Excellent

[jamesnevil303]

Great answer, keep it coming