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7Sci CH7

7th Science CH7 Moving the Body

bone marrow gel-like substance filling spaces within the bones
cardiac muscle muscle found only in the heart; pumps blood through the heart and to the cells of the body by rhythmically relaxing and contracting
cartilage rubbery material which first forms the skeletal system, later replaced by bone; cartilage also helps reduce bone-on-bone friction at joints
compact bone hard, thick, outer bone layer in which compounds of calcium and phosphorus are concentrated; protects internal organs, supplies support and a place for muscle attachment
joint places where two or more bones of the skeleton join; movable joints allow actions such as bending your legs; immovable joints do not allow motion and form the bones of the skull
ligament strong bands of tissue that hold bones together; injury to ligaments can result in sprains
skeletal muscle muscles that move bones; skeletal muscles work in pairs-when one skeletal muscle contracts, its partner relaxes
smooth muscle moving food through your digestive system is an example of work done by smooth muscles; smooth muscle is found in many places inside your body, but you do not control its actions
spongy bone inner bone layer containing many openings filled with bone marrow and tiny hard bone spikes made of minerals; found toward the ends of many compact bones; helps keep the skeleton lightweight and functions as shock absorber
tendon elastic, strong tissue bands that attach skeletal muscles to bones at movable joints