Unit 3 Content Knowledge

Front

system

Back

a group of items or things that are connected and work together

Front

cells

Back

the smallest units of living things

Front

axial bones

Back

bones located down the center of a vertebrate's body

Front

skeletal system

Back

framework for the human body and keeps us upright

Front

muscles

Back

body tissue made of long cells that can contract and relax to produce motion

Front

types of joints

Back

immovable, movable, partially movable

Front

voluntary action

Back

an action you choose to make, such as lifting your arm

Front

sections of the brain

Back

cerebrum, cerebellum, and medulla

Front

optic nerve

Back

sends messages from your eyes to your brain