In St. Lucia, a farmer notices that white blood cells in his livestock increase when the animals have infections. Which feature of white blood cells enables them to destroy pathogens effectively?

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Question

In St. Lucia, a farmer notices that white blood cells in his livestock increase when the animals have infections. Which feature of white blood cells enables them to destroy pathogens effectively?

Accepted Answer

Ability to change shape and engulf pathogens — Award 1 mark for identifying the ability to change shape and engulf pathogens. White blood cells can squeeze through capillary walls and engulf pathogens by phagocytosis, or produce antibodies to destroy them. A describes red blood cells. C is incorrect as white blood cells do not contain haemoglobin. D is incorrect because white blood cells have a nucleus.

Answer

Lack of a nucleus to create more space

Answer

Biconcave shape to carry oxygen

Answer

Presence of haemoglobin

Answer

Ability to change shape and engulf pathogens

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