What substances that are part of a persons hair nails skin muscles and blood vessels?

Hair, nails, skin, muscles, and blood vessels are primarily composed of proteins, particularly keratin in hair and nails, and collagen in skin and blood vessels. Additionally, they contain lipids, which help maintain moisture and provide structural integrity. Muscles are largely made of muscle fibers, which are composed of proteins like actin and myosin. Blood vessels also contain smooth muscle cells and endothelial cells, contributing to their structure and function.