Question

an abnormal tube - like passage is called a:
a fistula.
b fissure.
c diverticulum.
d polyp.

Explanation:

A fistula is an abnormal tube - like passage. A fissure is a crack or groove. A diverticulum is a pouch or sac formed from an outpouching of the wall of a hollow organ. A polyp is a growth that projects from a mucous membrane.

Answer:

A. fistula