skin biology

Skin is the body's largest organ, serving as a protective barrier against environmental threats like bacteria, UV rays, and chemicals. It consists of three main layers: the epidermis (outer layer), dermis (middle layer), and subcutaneous tissue (inner layer). The epidermis produces new skin cells and contains melanin for pigmentation. The dermis houses blood vessels, nerves, and connective tissue, providing strength and elasticity. The subcutaneous layer helps insulate the body and stores fat. Skin also plays a vital role in temperature regulation, sensation, and producing vitamin D, essential for overall health.