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O-LevelBiologyTransport in Humans5090/11 · Oct/Nov 2025 · Q191 Mark

What prevents pathogens from entering the human body?

Aantibodies and lymphocytes
Bantigens and memory cells
Cred blood cells and lymphocytes
Dstomach acid and mucus

✓ Correct answer

D: stomach acid and mucus

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About this question

Topic
Transport in Humans, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source
O-Level Biology, Oct/Nov 2025 Paper 1 Variant 1, question 19.

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