| A | B |
|---|
| cell | the basic unit of life which makes up all living things |
| tissue | a group of similar cells working together to perform a particular function |
| organ | a structure made up of two or more types of tissue that work together to carry out a function in the body |
| organ system | a group of organs that together perform a function of the body |
| homeostasis | the ability of your body to maintain internal conditions like body temperature or the amount of sugar in your blood |
| skeletal system | the framework of bones that supports the body, protects internal organs, and anchors all body movements |
| compact bone | dense tissue that gives bone much of its strength |
| spongy bone | strong, lightweight tissue inside a bone |
| axial skeleton | the central part of the skeleton, which includes the cranium, the spinal column, and the ribs |
| appendicular skeleton | the bones of the skeleton that function to allow movement, such as arm and leg bones |
| joint | a place where two bones meet; may be classified as immovable, slightly movable, and freely movable |
| muscular system | the muscles of the body that work with the skeletal system to produce movement |
| skeletal muscle | muscle that attaches to the skeleton |
| voluntary muscle | a muscle that can be moved at will |
| smooth muscle | muscle that performs involuntary movement and is found inside certain internal organs |
| involuntary muscle | muscle that moves without conscious control |
| cardiac muscle | muscle that makes up the heart |
| tendon | attaches muscles to bones |
