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the ability of a living thing to keep conditions inside its body constant


a sheet or band of tough fibrous tissue connecting bones or cartilages or supporting muscles or organs

Skeletal system

the hard structure (bones and cartilages) that provides a frame for the body of an organism


strong connective tissue that attaches muscle to bone

Muscular system

the organ system whose primary function is movement and flexibility


hinge joint between the forearm and upper arm and the corresponding joint in the forelimb of a quadruped


internal skeleton


the fatty network of connective tissue that fills the cavities of bones


tough, flexible connective tissue

Spongy bone

part of bone with many small pores or spaces

Compact bone

The dense, hard layer of bone tissue

Smooth muscle

a muscle that contracts without conscious control and found in walls of internal organs such as stomach and intestine and bladder and blood vessels (excluding the heart)

Cardiac muscle

muscle tissue found only in the heart

Skeletal muscle

A muscle that is attached to the bones of the skeleton and provides the force that moves the bones.

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