1) Select which option is a bodies first line of defence? a) Teeth b) Hair c) Eyes d) Skin 2) Which cell is part of the immune system? a) Red blood cell b) Pathogen c) White blood cell d) Nerve cell 3) Where are white blood cells produced? a) Bone marrow b) Heart c) Liver d) Kidneys 4) What body system do white blood cells belong to? a) Circulatory system b) Immune System c) Respiratory System d) Digestive System 5) What do white blood cells produce to fight pathogens? a) Antibodies b) Bacteria c) Antivirals d) Antibiotics

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