The structure of human cells, levels of organisation, and movement of substances across membranes.
A balanced diet, the digestive system, digestive enzymes, and absorption in the small intestine.
The breathing system, the mechanism of ventilation, and gas exchange in the alveoli.
The components of blood, the heart and blood vessels, and the double circulation.
Neurones and the reflex arc, the eye, and hormonal control.
Keeping a constant internal environment: blood glucose, temperature, and the kidneys.
The reproductive systems, the menstrual cycle, fertilisation, pregnancy and contraception.
Pathogens and how disease spreads, the body's defences, immunity and vaccination.