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Name_____________________________________ Period______ Class Notes: Skeletal and Muscular System Composition of Bones Bones are connective tissue made of living cells. Periosteum Compact Bone Marrow Spongy Bone Cartilage Periosteum __________________________ thin membrane covers and protects bones Compact Bone __________________________ tough, hard bone; contains bone cells and blood vessels Marrow __________________________ Cartilage __________________________ Spongy Bone __________________________ soft, net-like connective tissue that produces red or white blood cells tough, flexible connective tissue; covers ends of the bones; acts as a shock absorber porous, light-weight bone Name_____________________________________ Period______ Joints joint The place where two or more bones connect is called a ____________________. Bones are ligaments joined to each other by strong elastic bands of connective tissue called ___________________. Name_____________________________________ Period______ Muscles in the Human Body There are more than ____________ muscles in the body. There is some type of muscle tissue in 650 muscle every system of your body. A ________________________ is the organ in which the cellular tissue contracts and relaxes to allow movement. Name_____________________________________ Period______ pull Muscles always _________________________, they never push. pairs Skeletal muscles always work in _______________. contracts When one muscle of the pair __________________, relaxes the other muscle of the pair ________________ and returns to its original length. electrical impulse Cardiac muscle cells generate their own___________________________________ that cause them to contract. The entire heart beats as the cells contract together.