heat definition In physics, a form of energy associated with the movement of atoms and molecules in any material. The higher the temperature of a material, the faster the atoms are moving, and hence the greater the amount of energy present as heat.
Cilia (singular: cilium) are microscopic, hair-like structures that extend outwardfrom the surface of manyanimal cells. These structures are important in the cell cycle and replication, and cilia play a vital part in human and animal development and in everyday life. A typical cilium is between one and ten micrometers long, and usually less than one micrometer wide.
An example of motile cilia can be found in humans in the lining of the windpipe, where they sweep mucus and dirt out of the lungs. Normally a cell only has one non-motile cilium. There are some cells in the body that have a specialized primary cilium which have a very important job to do.here are two types of cilia, motile cilia (moving cilia) and non-motile cilia. Motile cilia constantly beat in a single direction, whilst non-motile cilia typically sense the cellsâ environment. Non-motile cilia are often referred to as âprimaryâ cilia.