CELLS AND SPECIALISATION All living things are made up of tiny, microscopic units which we call cells. Animal cells Animal cells are made up of many different elements: Plant cells Plant cells contain all of the elements which make up animal cells, but they also include: Specialisation A cell that has adaptations to carry out a particular function. Organisms can be: Single-celled - where all life processes are carried out by one cell. Multi-celled - where cells differentiate and become specialised to carry out a particular function (e.g. red blood cells carry oxygen) Specialised cells are organised. There are different levels of organisation: - Cells with the same structure and function are known as tissue (e.g. muscle tissue). Several types of tissue that carry out a particular function is an organ (e.g. the heart organ contains muscle and nerve tissue). Organs that work together to carry out a particular function are known as an organ system. (e.g. the circulatory system.
