| A | B |
|---|
| heart | made of cardiac muscles |
| iron | hemoglobin is composed partly of this mineral |
| septum | thick wall dividing the heart down the middle |
| antibodies | Fights foreign organisms and toxins |
| capillaries | smallest of the body's tubes carrying blood |
| ventricles | two bottom chambers of the heart |
| aorta | largest artery |
| red blood cells | do not have a nucleus |
| pulse | pushing of blood through the body |
| platelets | parts of blood that aid in clotting |
