Social organisation Social organisation is the structured way in which people relate to one another and cooperate to meet shared […]

Digestive disorders Digestive disorders interfere with the normal processing, absorption, or movement of food. Examples include constipation, diarrhoea, indigestion, heartburn, […]

Enzymes Enzymes are biological catalysts. They speed up chemical reactions in living organisms without being used up. An enzyme has […]

Food and nutrients Food supplies energy, materials for growth and repair, and substances that regulate body processes. The main nutrient […]

Characteristics of fungi Fungi are organisms that lack chlorophyll and therefore do not make food by photosynthesis. Many fungi consist […]

Plant nutrition Plants require light, carbon dioxide, water, mineral ions, and a suitable temperature for healthy growth. Carbon dioxide enters […]

Organs An organ is a structure made of two or more tissue types working together to perform a specialised function. […]

What is a tissue? A tissue is a group of similar cells, together with their supporting material, that work together […]

Cellular exchanges Cellular exchange is the movement of substances into and out of a cell. Substances cross the cell surface […]

Introduction to Human Biology Human Biology is the study of the human body, the environment in which people live, and […]