| A | B |
|---|
| homeostasis | The internal balance an organism must maintain. |
| atrium | Upper heart chamber that receives blood from the lungs or body. |
| ventricle | Heart chamber which pushes blood into the arteries. |
| deoxygenated blood | Blood depleted of oxygen, returning to the heart. |
| oxygenated blood | Blood with abundant oxygen. |
| erythrocytes | A red blood cell which transports oxygen. |
| hemoglobin | Red pigment found in red blood cells which is the holding site for oxygen. |
| leukocyte | A white blood cell functioning primarily with the body's immune system. |
| antibody | Protein the body produces to attack or mark for attack invading materials such as bacteria and viruses. |
| platelet | a small structure found in the blood; involved in the formation of blood clots. |
| blood plasma | Fluid portion of the blood. |
| antigen | Molecules that the macrophages recognize as not belonging in the body, triggering the immune system. |
| immunity | ability of an organism to recognize and attack a pathogen to which it has been previously exposed; the formation of antibodies |
| autoimmune disorder | Disease in which a person's immune system attacks and destroys his own cells. |
| urinary bladder | Organ that temporarily stores the fluid wastes from a kidney. |
| urine | A fluid that is passed out of the body which contains wastes from the blood. |
