| A | B |
|---|
| circulatory system | move blood throughout the body to deliver O2 and nutrients, take away CO2 and waste - heart & blood vessels |
| digestive system | break down and absorb nutrients from food - teeth, esophagus, stomach, intestines |
| endocrine system | communicate chemical signals - glands |
| excretory system | filter and get rid of waste - large intestine, kidneys |
| immune system | protect the body from infections - white blood cells, lymph nodes and vessels |
| integumentary system | protect the body from the outside world and regulate temperature - skin |
| muscular system | make movement possible - voluntary and involuntary muscles |
| nervous system | communicate electrical signals - brain, spinal cord, nerves |
| reproductive system | make offspring - testes, ovaries, uterus |
| respiratory system | take in O2 and get rid of CO2 - trachea, lungs |
| skeletal system | support, protection, and something for muscles to pull against - skull, ribs, other bones |
