Specific immunity is the result of:
Correct answer: B. 3rd line of defense
- A. 1st line of defense
- B. 3rd line of defense
- C. 2nd line of defense
- D. 4th line of defense
Explanation
The third line of defense is immune cells that target specific antigens. The immune cells that play a role in the third line of defense are B-cells and T-cells, both are white blood cells. The B-cells produce antibodies. The T-cells help identify pathogenic cells and destroy targeted cells.
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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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