A human body cell normally has 46 chromosomes. A string of pearls may be used as a simple model of a chromosome. Each pearl represents a gene. The row of pearls is like a chromosome with its genes. Sugar and starch are two carbohydrates.
Carbohydrates are important sources of energy.
During digestion, most carbohydrates are changed to a simple sugar called glucose. Glucose is carried to the body's cells by the circulatory system. In the cells, glucose is broken down with the help of oxygen in the chemical change that releases energy. The energy is used for the growth and repair of cell parts and for other cell activieies. It is formed from glucose and stored in the liver and muscle cells.