Final answer:
Collagen is the primary protein in connective tissues, amounting to 30% of total protein in animals. It is a fibrous protein responsible for providing structural support. Collagen's critical role in connective tissue health underscores its biological importance.
Step-by-step explanation:
Collagen is the main protein found in connective tissues in animals and constitutes about 30% of the total protein in animal bodies. This fibrous protein is essential for the structure and strength of connective tissues, which include tendons, ligaments, skin, cartilage, bones, and blood vessels. Collagen fibers in the extracellular matrix (ECM) are secreted by cells and provide support and structure to tissues.
Proteins are complex molecules made up of amino acid chains and can be classified based on their solubility and shape into two categories: fibrous (insoluble) and globular (soluble). Fibrous proteins, like collagen, keratin, myosin, and elastin, play an important role in structural, connective, and protective functions. They are characteristically insoluble in water and form the framework of various biological structures.
Overall, the unique properties of collagen make it indispensable for the body's structural integrity, highlighting its significance in animal physiology and the field of biomedicine.