skeletal system - contains bones as well as other structures that connect and protect the bones and support other functions of the body, cartilage - strong, flexible tissue that covers the ends of bones, periosteum - membrane that surrounds the bone, joint - where 2 or more bones meet, ligaments - connects bones to other bones, arthritis - a disease in which joints become irritated or inflamed, osteoporosis - disease that causes bones to weaken and become brittle, 4 main functions of the muscular system - movement, stability, protection, and temperature regulation, 3 main types of muscles - skeletal muscle (biceps), cardiac muscle (heart), and smooth muscles (stomach), voluntary vs involuntary muscles - voluntary- you have control over, moves your bones; involuntary- you cannot control, internal organs, such as stomach, blood vessels, etc. , how to keep muscles healthy - eating an good diet and exercise,

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