| A | B |
|---|
| indigestion | one or more symptoms, such as stomachache, that occur when the body has difficulty digesting food |
| anemia | a condition in which the number of healthy red blood cells or the amount of hemoglobin is low |
| high blood pressure | a disease in which blood is pumped through the arteries with too much force |
| atherosclerosis | a disease in which fatty substances build up on the inside walls of arteries |
| concussion | a condition caused by a sudden movement of the brain inside the skull, usually involving a brief loss of consciousness |
| helmet | protects the brain from damage during activities such as skating or biking |
| carbon monoxide | poisonous gas found in cigarettes and other tobacco products |
| wash your hands | simple method of keeping germs out of your digestive system |
