describe the function of epidermis
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Answer:
Explanation:
What is the Epidermis?
When we think of protecting our bodies from the elements, we may think of putting on a jacket, or shoes and socks. Perhaps you use sunscreen, and wear a hat and sunglasses. Fortunately, in addition to what we wear, we also have a built-in protective covering that keeps our insides safe from our external environment. Our skin, the largest organ in our body, serves this crucial purpose with a layer known as the epidermis as our first line of defense. In this lesson, we will take a closer look at this skin layer and gain an understanding of why it is so important to our body.
Function of the Epidermis
The epidermis is the outermost layer of our skin. Tough and resilient, protection is its number one job. Think of a parka you may wear in the winter. The inside is lined with soft fleece, providing a layer of warmth. But the outside is made of a strong waterproof material that lets nothing through. It is a similar situation with our own epidermis.
Cross-Section of Skin
Cross section of skin
The protective qualities of our outer layer are vast. Our epidermis is waterproof, which is why we don't swell with liquid each time we bathe. The cellular structure of the epidermis also forms a highly effective barrier against germs. When skin is healthy and intact, it is difficult for bacteria and viruses to make an entrance. In addition, cells of the epidermis have the miraculous ability to regenerate, or grow back, unlike many other cells in the body. When we suffer from a wound, healthy skin heals and replaces damaged cells with ease.
Layers of the Epidermis
The epidermis is composed of four main strata, or layers. The outermost layer is called the stratum corneum, which is Latin for ''horny layer.'' While we aren't literally covered in horny scales, this layer is tough nonetheless. It also varies in thickness depending on the body part it covers. If you often go barefoot, the stratum corneum on the sole of your foot is probably quite thick. Compare that to the skin on your eyelids and you can see the drastic difference.
Epidermis protects against water loss , regulates gas exchange , secrets metabolic Compounds and absorb water and mineral nutrients.
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