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Science Ch 3
Human Body Systems
| Term | Definition |
|---|---|
| digestion | breaking down food into simpler substances that your body can use |
| saliva | a watery fluid that softens and moistens food |
| esophagus | the long muscular tube that brings food into the stomach |
| stomach | a muscular organ that changes food into a thick soupy liquid |
| small intestine | the organ that completes digestion and allows digested food to enter the blood |
| large intestine | the thick tube-like organ that removes undigested waste |
| diaphragm | a large, flat muscle that pulls air in and pushes air out of the lungs |
| lung | one of the two organs that fills with air when you inhale |
| alveoli | air sacs in the lungs where gases move into and out of the blood |
| capillary | a tiny blood vessel |
| heart | a muscular organ that constantly pumps blood throughout the body |
| artery | a thick-walled blood vessel that carries blood away from the heart |
| vein | a blood vessel that carries blood back to the heart |
| kidney | an organ that filters certain body wastes out of the blood |
| bladder | an organ that stores liquid wastes from the kidneys temporarily |
| nephron | a part of the kidneys where waste materials are separated from useful materials in the blood |
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