Integumentary System
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The integumentary system is vital to every mammal's body. Skin and its accessory organs such as fingernails and hair make up this system. The purposes of the integumentary system are to protect the body from infection and injury, regulate body temperature, remove waste from the body, protect the body from UV rays, and produce vitamin D. It also receives various stimuli such as pain and heat and sends them to the brain.
When a human being is still a tiny embryo inside of it's mother, it does not yet have the organs of a fully developed human. By day 15-16 of development, the three "germ" layers of the embryo have fully developed. These layers are called the endoderm, mesoderm, and ectoderm, and are the parts from which all of our body systems are derived. During the third week, the endoderm, the innermost layer, begins to develop into the digestive system and parts of the reproductive, urinary, respiratory, and endocrine systems. At the same time, the mesoderm, or middle layer, is turning into the muscular, cardiovascular, skeletal, and lymphatic systems as well as parts of the endocrine, respiratory, urinary and reproductive systems. Part of the outermost layer, the ectoderm, develops into the nervous system, while the rest forms the integumentary system...