| A | B |
|---|
| nutrient | a substance in food that the body uses for energy, for growth and repair, or for working well. |
| digestion | the changing of fod into forms that the body can use |
| saliva | the liquid in the mouth that makes chewed food wet and begins digestion |
| enzyme | chemical that helps yur digestive system change food into nutrients |
| esophagus | the tube that carries food and liquids from the mouth to the stomach |
| small intestine | the organ of the digestive system in which most digestion takes place |
| plasma | the watery part of blood that carries nutrients, wastes, and blood cells |
| red blood cell | the kind of blood cell that carries oxygen to other body cells |
| white blood cells | the kind of blood cell that fights germs |
| platelet | a tiny part of a cell that helps stop bleeding |
| artery | the kind of blood vessel that carries blood away from the heart |
| capillary | a tiny blood vessel with thin walls through which oxygen, nutrients, and wastes pass |
| vein | the kind of blood vessel that carries blood back to the heart |
| atrium | one of two spaces in the top part of the heart that receive blood from veins |
| ventricle | one of two spaces in the bottom part of the heart that pump blood out of the heart |
| sense organ | a body part that has special nerve cells that gather information about the surroundings |
| nerve cell | a cell that gathers and carries information in the body |
| nerve ending | a tiny branch of a nerve cell that gathers information |
| spinal cord | a thick bundle of nerves that connects the brain and nerves throughout the body |
