Answer: Hydrochloric acid.
- A Bile from the liver
- B Sodium bicarbonate
- C Hydrochloric acid
- D Digestive enzymes only
Correct answer: C. Hydrochloric acid
Explanation: Histamine stimulates the stomach wall to secrete hydrochloric acid. Ranitidine and cimetidine are H2-receptor blockers that prevent this, reducing acid production.
The hydrophobic hydrocarbon tail of each soap/detergent molecule dissolves into an oily dirt droplet, while the hydrophilic (ionic) head stays in the surrounding water - trapping the grease inside a micelle that rinses away with water.
Concept context
Drugs and how they interact with biological targets, chemicals in food, and cleansing agents (soaps and detergents) - chemistry applied directly to daily life and healthcare.