Question

The diagram shows the human gut. Which numbered structures secrete digestive enzymes?
A. 1, 2, 3 and 4
B. 1, 2, 3 and 6
C. 2, 3, 4 and 5
D. 2, 3, 5 and 6

Answer 1

B. 1, 2, 3 and 6 secretes digestive enzymes.

• The mouth secretes salivary amylase that starts to break down carbohydrates.
• The stomach secretes pepsinogen, the inactive form of the enzyme. This is converted into pepsin by the hydrochloric acid present in the stomach.
• Pancrease secretes enzymes like amylase and lipase.
• The small intestine also secretes the inactive enzyme trypsinogen. This enzyme converts to an active form called trypsin.