All are examples of 1st line of defense except:
Correct answer: D. Antibodies
- A. Skin
- B. Mucus
- C. Stomach HCL
- D. Antibodies
Explanation
Skin, HCl and mucous of barriers which constitute 1st line of defense while antibodies produced by lymphocytes which belong to 3rd line of defense
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About Digestion
The human digestive system covers the organs from mouth to anus, the movement of food, and the mechanical and chemical breakdown of carbohydrates, proteins and fats. It also includes the roles of digestive enzymes, bile, absorption through intestinal villi, and the assimilation of nutrients by body cells.
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