The Walls of the Alimentary Canal Have a Similar Arrangement

Question

The walls of the alimentary canal have a similar arrangement of tissue layers called ____.
A) mucosa
B) tunics
C) serosa
D) propria

Accepted Answer

The walls of the alimentary canal have four distinct tissue layers, known as tunics. These layers are the mucosa, submucosa, muscularis externa, and serosa (or adventitia in some areas). Therefore, B is the correct answer as it refers to the tissue layers specifically found in the alimentary canal. A, C, and D are all specific layers within the tunics, and would not encompass all of the tissue layers present in the alimentary canal.