The human body has a number of barriers to prevent infection by pathogens some of which are listed below.
1. Skin
2. Mucus
3. Antibodies
4. Stomach acid
5. Hair in the nose
Which are these are examples of mechanical barrier?
A. 1 and 4
B. 2 and 3
C. 3 and 5
D. 5 and 1
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In many multicellular animals, pathogens are recognised as foreign and are attracked by the immune system.
Which of the following may be produced during an immune response?
A. Antigens
B. Antibiotics
C. Pathogen
D. Antibodies
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