Biology A-level Question! Watch

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Report Thread starter 1 year ago
A student cut their hand during a field trip. The bleeding stopped within a few minutes and formed a scab over the cut. However, over the next three days they noted that the area around the cut became swollen, red and tender. They also noted a small swelling and discomfort in their armpit.

Describe the non-specific defences against pathogens that would explain all these observations.
Lord Nutter
Badges: 16
Report 1 year ago
The cut caused the pathogen to enter the wound. There are mast cells that can detect if a pathogen is present, if so the mast cells can release a chemical called histamine that can cause inflammation in the area, as the chemical can increase blood flow in the area and causes blood vessel to widen - so that more phagocytes can enter and deal with the pathogen.

^^ that is one of the non-specific defenses (before you say anything I know it does not sound like it is non-specific but according to the AQA syllabus it is)

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