Key term for OCR GCSE Biology A, used in Health and disease.
A substance produced by the body, such as sebum or hydrochloric acid, that kills or inhibits the growth of pathogens.
Chemical barrier appears in OCR GCSE Biology A revision content for Global challenges, especially Health and disease and Non-specific defence systems.
Create a free account to access OCR GCSE Biology A revision notes, track progress, and practise related key terms.
