The muscular system<span> is responsible for the movement of the human body. Attached to the bones of the </span>skeletal system<span> are about 700 named </span>muscles<span> that make up roughly half of a person's body weight. Each of these </span>muscles<span> is a discrete organ constructed of </span>skeletal muscle<span> tissue, blood vessels, tendons, and nerves.</span>
The endocrine system is a chemical messenger system comprising feedback loops of the hormones released by internal glands of an organism directly into the circulatory system, regulating distant target organs. In humans, the major endocrine glands are the thyroid gland and the adrenal glands.
You can find anything here such as heath and other or you can try this website https://www.girlshealth.gov or even http://www.webmd.com i think web md is a good website
The Recommended Daily Value is there to guide on what daily doses your body needs to function properly. having too much or too little can affect the body.
