When one branch of the AV node conducts the impulse forward and the other branch of the AV node conducts it backward, this is called ____ tachycardia.

A qualifying circumstance code complicated by emergency conditions is:

a. 99100. b. 99116. c. 99135. d. 99140.

The ________ cells are cells that do not transmit impulses, but function as support cells for neurons and never lose their ability to divide.

Fill in the blank(s) with the appropriate word(s).