The part of mammalian skin that excretes metabolic wastes is?

The part of mammalian skin that excretes metabolic wastes is the sweat gland. The sweat glands are responsible for producing and secreting sweat, which is a mixture of water, salts, and other substances, including metabolic waste products. The sweat is produced in response to changes in body temperature, such as during physical activity or exposure to warm environments, and it is released onto the surface of the skin through small openings called sweat pores. From there, it evaporates and helps to regulate the body's temperature. The horny layer is the outermost layer of the skin, composed of dead skin cells that have been pushed to the surface. It acts as a protective barrier, helping to keep harmful substances out of the body. The Malpighian layer is the deepest layer of the skin, and it contains blood vessels, nerve endings, and other structures that are important for the skin's function. The sebaceous glands are small glands in the skin that produce an oily substance called sebum, which helps to moisturize the skin and protect it from environmental damage.