The gastric glands in the human stomach secrete several important digestive substances:
- Hydrochloric acid (HCl) helps in breaking down food and creating an acidic environment for the enzyme pepsin to act.
- Pepsin is an enzyme responsible for breaking down proteins into smaller peptides.
- Mucus protects the stomach lining from the acidic environment and helps prevent ulcers.
Thus, the correct answer is (B) Hydrochloric acid, Pepsin, Mucus.