| Term | Definition |
|---|
| heart | a hollow muscular organ that pumps blood throughout the body |
| blood | functions carrying gases (co2 and o2) nutrients and waste around the body |
| circulatory system | carries needed materials to the body cells; carries wastes away from body cells; helps fight disease |
| indicator | chemical that changes its appearance in different types of solutions |
| btb | bromthymol blue a chemical indicator that changes its appearance when co2 is in it |
| co2 | the gas that is produced when o2 is used to access energy from nutrients the respirtory system removes it |
| o2 | The gas that is inhaled through the respiratory system and that is required to access energy from the nutrients that gets absorbed from the digestive system. |
| alveoli | Tiny sac-like air spaces in the lung where carbon dioxide and oxygen are exchanged. |
| trachea | The "windpipe" that connects the throat and the bronchi. Walls are made of cartilage which protect the trachea from collapsing. |
| lungs | The main organs of the respiratory system. |
| Respiratory System | The system that takes oxygen into the body and eliminates carbon dioxide. |
| large intestine | Absorbs water into the blood stream and prepares undigested food for elimination. |
| Absorption | The process by which nutrient molecules pass through the wall of the digestive system and into the blood. |
| Nutrients | The substances in food that give the raw material and the energy needed by the body |
| Pancreas | Produces digestive enzymes to further breakdown fat, proteins, and starches. |
| Small Intestine | Absorbs useable nutrients which are sent to all body parts by blood vessels. |
| Esophagus | Food passageway between mouth and stomach. |
| Stomach | Receives food, churns it, and adds hydrochloric acid. |
| Saliva | The fluid released in your mouth that begins the chemical breakdown process. |
| Teeth | Hold, tear, and chew food. |
| Digestive System | Takes food into the body, breaks down food, and absorbs the digestive material. |
| Chemical Breakdown | Chemicals produced by the body break food into their chemical building blocks (saliva in mouth, digestive chemicals in stomach and small intestines). |
| Mechanical Breakdown | Food is physically broken down into smaller pieces (teeth/jaw and stomach). |
| Model | Scientist use pictures, diagrams, other representation to help understand small, large, complex things or processes. |
| Excretory System | Removes liquid waste from the body(includes the kidneys and bladder). |
| Organ System | A group of organs/structures working together to perform a major function in the body. |
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