Multiple choice

The substance that lubricates the food in the alimentary canal is

  1. hydrochloric acid

  2. ptylan

  3. mucin

  4. pepsin

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mucin is the mucus secretion that lubricates food in the alimentary canal, helping it move smoothly. Hydrochloric acid digests food, ptyalin (salivary amylase) digests starch, and pepsin digests proteins.