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.
Cilia and Flagella Centrioles. Centrioles are also used in the cell structures cilia and flagella. Cilia are lots of small projections on cells, like little hairs that whip back and forth to move the cell or move material over or around the cell.Cells in the lungs, for example, use cilia to move mucus out of the lungs.entrioles are also used in the cell structures cilia and flagella. Cilia are lots of small projections on cells, like little hairs that whip back and forth to move the cell or move material over or around the cell. Cells in the lungs, for example, use cilia to move mucus out of the lungs.