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Cholera is a disease that can be caused by drinking contaminated water - Edexcel - GCSE Biology - Question 1 - 2013 - Paper 1
Question 1
Cholera is a disease that can be caused by drinking contaminated water. (a) (i) Complete the sentence by putting a cross (X) in the box next to your answer. Cholera... show full transcript
Worked Solution & Example Answer:Cholera is a disease that can be caused by drinking contaminated water - Edexcel - GCSE Biology - Question 1 - 2013 - Paper 1
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Describe how pathogens are prevented from entering the human body.
Answer
Pathogens are prevented from entering the human body through several mechanisms:
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Mucus: This sticky substance traps pathogens, preventing them from entering the respiratory system.
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Cilia: Tiny hair-like structures that line the respiratory tract move mucus and trapped pathogens out of the lungs.
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Skin: The skin acts as a physical barrier against pathogens.
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Hydrochloric acid: The stomach produces hydrochloric acid that kills many pathogens ingested with food.
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Lysosomes: Enzymes present in tears and saliva that break down the cell wall of bacteria.
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Nasal hairs: These hairs trap larger particles from entering the nasal passage.