Answer:
1. The integumentary system consists of the skin, hair, nails, glands, and nerves. Its main function is to act as a barrier to protect the body from the outside world. It also functions to retain body fluids, protect against disease, eliminate waste products, and regulate body temperature.
2. The skin -- the largest organ in the body -- consists of multiple layers and is the most important natural barrier to infection. The thick outer skin surface prevents most bacteria from passing into the body. Glands in the skin secrete sweat and an oily substance called sebum.
3. Epidermis, "epi" coming from the Greek meaning "over" or "upon", is the outermost layer of the skin. It forms the waterproof, protective wrap over the body's surface which also serves as a barrier to infection and is made up of stratified squamous epithelium with an underlying basal lamina.
4. The outer shell protects a rider’s head from penetrating objects. The shell also protects the head from abrasions should it hit the pavement. The liner of the helmet has shock-absorbing qualities that absorb the shock from a collision and collapse slowly. The foam liner keeps the head comfortable and the helmet fitting snugly.
5. The coiled part in the dermis is where sweat is made, and the long part is a duct that connects the gland to the opening or pore on the skins's outer surface. Nerve cells from the sympathetic nervous system are connected to the sweat glands. There are two types of sweat glands.
6. Sorry I didn't answer number 6
7. Hypodermis or subcutaneous layer This consists of adipose tissue that stores energy in the form of fat. It is also connective tissue that cushions and insulates the body. Any burn that destroys all layers of the skin and reaches the hypodermis is a third-degree burn.
