| A | B |
|---|
| basic building block of all living thigs | cell |
| brings oxygen into the body | respiratory system |
| group of tissues that work together | organ |
| structure at the end of a neuron that detects information | receptor |
| fast reaction when nerves work without involving the brain | reflex |
| all the bones and cartilage that support the body | skeletal system |
| jelly-like substance indise of a cell | cytoplasm |
| strong tissue that hods bones together at joints | ligament |
| small sacs in the lungs where gases are exchanged | alveoli |
| tiny blood vessles where materials pass between blood and cells | capillaries |
