19. The skin and mucus membranes protect the body from invading organisms by: a)

Question

19. The skin and mucus membranes protect the body from invading organisms by: a) providing a physical barrier b) the action of enzymes such as lysozyme c) maintaining low phH d) all of the above Components of an activated complement system: c) lyse open bacterial cells 20. increase inflammation b) attract phagocytes to the area d) all of the above 21. Antibodies protect the body by: a) decreasing phagocytosis of bacteria b) binding to and neutralizing toxins c) binding tightly to iron d) all of the above

Explanation / Answer

Ans 19:

(D) all of the above

Skin has low pH (5.5) whic helps to retard Growth of various pathogens.

Similarly, mucus membrane contains lysozyme which kills pathogens by lysis of cells.

Both skin and mucus membrane act as physical barrier.

Ans 20:

(D) all of the above

Ans21:

(B) binding to and neutralising toxins

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