This is part of a defence mechanism to stop particles getting into your lungs. Sperm cells are specialised to be able to swim to fertilise an egg. Fat cells store fat used for insulation under the skin. A group of cells of the same type which are performing the same function is called a tissue. Muscle cells can contract to move parts of the body.
Nerve cells communicate to send messages around the body.
Palisade cells are found in the leaf. They make food for the plant. Organs are made from different tissues which are coordinated to work together. The heart contains many different tissues such as nerve tissue, fat tissue and epithelial tissue, but it is mainly made of cardiac muscle tissue. Organs work together to ensure that the body functions properly.