| A | B |
|---|
| Plasma | made mostly of water |
| Red Blood Cells | Carries oxygen |
| Red Blood Cells | does NOT have a nucleus |
| White Blood Cells | increase when there is an infection |
| White Blood Cells | fight infections |
| White Blood Cells | have a nucleus |
| Platelets | clot blood |
| Plasma | transport enzymes, hormones, nutrients and waste |
| Arteries | Carry blood away from the heart |
| Arteries | Largest blood vessels |
| Veins | Carry blood BACK to the heart |
| Veins | contain valves |
| Capillaries | smallest blood vessels; 1-cell thick |
| Capillaries | where gases exchange with the body cells |
| Capillaries | connect arteries and veins |
| Lungs | organ where oxygen enters the capillaries |
| Pulmonary Artery | Carries oxygen POOR blood to the lungs |
| Pulmonary Vein | Carries oxygen RICH blood back to the heart |
