A student gets a small cut on a finger. The student's hands carry bacteria that can cause disease.
The student washes their hands before touching the cut. Blood at the cut clots and a scab forms. A few bacteria entered the tissues before the scab formed.
State what is meant by a non-specific defence.
Give one reason why washing the hands reduces the chance of bacteria entering through the cut.
State how the scab helps to prevent bacteria entering the tissues.
White blood cells produce antibodies against the bacteria that entered the tissues.
Explain how an antibody helps the body to destroy a bacterium.
252 exam-style questions on AQA GCSE Biology 3.1 Communicable diseases, covering 3.1.1 Communicable (infectious) diseases, 3.1.2 Viral diseases, 3.1.3 Bacterial diseases, 3.1.4 Fungal diseases, 3.1.5 Protist diseases, 3.1.6 Human defence systems, 3.1.7 Vaccination, 3.1.8 Antibiotics and painkillers, and 3.1.9 Discovery and development of drugs. Each one has a worked solution and a mark scheme showing where the marks go.