| A | B |
|---|
| Plasma | This part makes up a little more than half of the blood (55%). |
| Plasma | This yellowish fluid is mostly water, but it contains thousands of other important substances. |
| Red Blood Cells | Small disk-shaped cells with depressions on both sides. |
| Red Blood Cells | Blood cells that carry oxygen and carbon dioxide |
| Red Blood Cell | A package of hemoglobin molecules |
| Hemoglobin Molecules | Oxygen and carbon dioxide bind to these large molecules. This allows for the transport of these gases throughout the bloodstream. |
| Red Blood Cell | This type of blood cell does not have a nucleus and therefore cannot repair itself when damaged |
| White Blood Cells | Blood cells that can squeeze through spaces in capillary walls to do their jobs |
| White Blood Cells | All of these cells fight infection |
| White Blood Cells | There are several different kinds of this type of blood cell, each with a specific job. |
| Platelets | Pieces of cell membrane that help stop bleeding |
| Platelets | This blood part releases substances that help cause a blood clot to form. |
