| A | B |
|---|
| tissue | group of similar cells |
| organ | groups of different tissue |
| organ system | group of organs |
| homeostasis | ability of body to maintain internal conditions |
| skeletal system | provides support and protection |
| compact bone | hard layer surrounding the spongy bone |
| spongy bone | bone that is strong, but lightweight |
| axial skeleton | includes cranium, spinal column, and ribs |
| appendicular system | bones in this skeleton allow movement, such as arms and legs |
| muscular system | provides movement for the body together with the skeletal system |
| skeletal muscle | muscle attached to the skeleton |
| voluntary muscle | muscle moved at will |
| smooth muscle | found inside hallow organs |
| involuntary muscle | muscle that moves without conscious control |
| cardiac muscle | makes up the heart |
