| A | B |
|---|
| # of chambers of the heart | 4 |
| # of bronchi | 2 |
| # of bones in adults | 206 |
| # of types of blood vessels | 3 |
| Largest bone in body | Femur |
| Found in the center of only the largest bones | Bone marrow |
| Protects your heart and lungs | Ribs |
| Muscles work in ... | Pairs |
| Your calf muscle | Gastrocnemius |
| Attach bone to bone | Ligaments |
| Attach muscle to bone | Tendons |
| Hundreds of millions collect oxygen | Alveoli |
| Wind pipe | Trachea |
| Found at the center of red blood cells | Hemoglobin |
| Your voice box | Pharynx |
| Food tube | Esophagus |
| Removes water from chyme | Large intestine |
| Breaks down sugar to get energy | Insulin |
| Oxygen-rich blood is ... | Red |
| Largest artery | Aorta |
| Vein that brings blood back to the right atrium | Vena cava |
| Color of blood on right side of heart | Blue |
