The Fascinating Functions of Skin: A Comprehensive Overview.
Skin is the body's largest organ and acts as a protective barrier between the external environment and the inside of the body. It regulates body temperature, prevents water loss, produces vitamin D, and detects sensations caused by mechanical stimuli. Skin is composed of three layers of tissue: the epidermis, dermis, and hypodermis. The skin microbiome refers to microorganisms, such as bacteria and fungi, that live on the surface of the skin and play an important role in protecting the skin from harmful microbes. Skin ages due to both "intrinsic" and "extrinsic" factors.