Chromosomes are long pieces of DNA found in the center (nucleus) of cells. Chromosomes and associated proteins carry portions of the hereditary information of an organism. Chromosomes are considered the building blocks of the human body. Chromosomes functions are based on the precise structure of the organelle that carries out that function. 
Chromosomes are thread-like, systematized structures that are made up of a combination of DNA and protein, found in the nuclei of cells. The chromosomes are wide in variety and vary among different organisms. In humans, each cell contains 23 pairs of chromosomes -- one of each pair taken from each parent. Of these 23 pairs, 22 pairs, or 44 chromosomes, are non-sex chromosomes -- also known as autosomes, and a single pair makes up a sex chromosome.