How is the stomach wall protected from acid?
Answer and explanation
Correct answer: By mucus layer
The governing concept is protection of the stomach lining during digestion. Gastric glands secrete mucus, which forms a coating over the inner stomach wall. This layer acts as a barrier and reduces direct contact between hydrochloric acid, pepsin and the living epithelial cells. Therefore option A is correct. Chlorophyll is a plant pigment, haemoglobin transports oxygen in blood, and bile salts assist fat digestion in the small intestine; none protects the stomach wall from acid.
Frequently asked questions
What is the correct answer to this question?
By mucus layer
Why is this the correct answer?
The governing concept is protection of the stomach lining during digestion. Gastric glands secrete mucus, which forms a coating over the inner stomach wall. This layer acts as a barrier and reduces direct contact between hydrochloric acid, pepsin and the living epithelial cells. Therefore option A is correct. Chlorophyll is a plant pigment, haemoglobin transports oxygen in blood, and bile salts assist fat digestion in the small intestine; none protects the stomach wall from acid.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Life Processes.
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