Front

Circulatory System

Back

blood, nutrients, gases, and wastes

Front

Heart

Back

blood throughout the body

Front

Respiratory System

Back

gases (oxygen and carbon dioxide)

Front

Lungs

Back

organs for breathing

Front

Digestive System

Back

down food for energy

Front

Stomach

Back

food using acids and enzymes

Front

Nervous System

Back

body activities with electrical signals

Front

Brain

Back

organ of the nervous system

Front

Skeletal System

Back

structure and support

Front

Bones

Back

organs and support the body