Absorption - GCSE Biology Definition

In GCSE Biology, 'absorption' refers to the process by which dissolved substances and nutrients are taken up by cells or tissues in an organism. In humans, absorption primarily occurs in the small intestine, where digested nutrients such as glucose, amino acids, and fatty acids move into the bloodstream. This allows the body to obtain the materials needed for energy, growth, and repair. In plants, absorption involves the uptake of water and mineral ions from the soil through root hair cells, supporting growth and transport within the plant.