| A | B |
|---|
| red blood cells | disk-shaped cells in the blood that contains hemoglobin |
| white blood cells | colorless cells in the blood that fight infection |
| plasma | the liquid part of the blood |
| platelets | cell fragments found in the blood that function in clotting the blood |
| hemoglobin | the pigment that gives blood its color and carries oxygen to the tissues |
| aorta | the main artery of the circulatory system that carries blood from the heart |
| capillaries | tiny blood vessels connecting arteries and veins and forming networks in the body |
| vena cava | one of tghe large veins by which the blood is returned to the heart |
| arteries | vessels that carry blood away from the heart |
| veins | vessels that carry blood back to the heart |
