â (statistics) a variable in a logical or mathematical expression whose value depends on the independent variable 1. the dependent variable. â (statistics) a variable in a logical or mathematical expression whose value depends on the independent variable 1. dependent variable [ the ~ ] noun.
The building blocks that make up all proteins, including collagen, are called amino acids. An essential amino acid is one your body cannot make, so you have to get it from food or dietary supplements. Collagen is the most abundant protein in the body and is a key constituent of all connective tissues. Collagen provides the infrastructure of the musculoskeletal system, essential for mobility.
80-90% of collagen in the human body consists of types I, II, and III collagen, although at least 16 different forms of the protein are known. Gram for gram, type I collagen is stronger than steel! Collagen used for medical purposes need not be human collagen. The protein may also be obtained from pigs, cattle, and sheep. Collagen may be applied to wounds to serve as a scaffold on which new cells can form, thus improving healing. Because collagen is such a large protein, it is not absorbed through the skin.