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Respiration/Excretio
Respiration and Excretion
| Term | Definition |
|---|---|
| pharynx | tube-like passageway used by food, liquid, and air |
| larynx | area between pharynx and trachea; where vocal cords are located |
| trachea | tube around 12 cm in length that leads to the lungs; made of cartilage; lined with mucous membranes and cilia to trap dust, bacteria, and pollen |
| bronchi | two short tubes that lead from the trachea to each lung |
| alveoli | tiny, thin-walled grape-like clusters at the end of each bronchiole that are surrounded by capillaries; exchange of oxygen and carbon dioxide takes place here |
| diaphragm | muscle beneath your lungs that relaxes and contracts to help move gases into and out of your lungs |
| emphysema | disease in which the alveoli in the lungs enlarge; limits the exchange of carbon dioxide and oxygen |
| asthma | reaction that causes bronchial tubes to contract quickly; causes shortness of breath, wheezing, and coughing |
| breathing | the movement of the chest that brings air into the lungs and removes waste gases |
| respiration | series of chemical reactions used to release energy stored in food molecules; requires oxygen |
| epiglottis | flap of tissue that covers the airway when swallowing to prevent food or liquid from entering |
| urinary system | system of excretory organs that rids the blood of wastes, controls blood volume by removing excess water, and balances concentrations of salts and water |
| urine | liquid waste that contains excessive water, salts, and other wastes that are not reabsorbed by the body |
| kidney | bean shaped urinary system organ that is made up of about 1 million nephrons and filters blood, producing urine |
| nephron | tiny filtering unit of the kidney |
| ureter | tube that carries urine from each kidney to the bladder |
| bladder | elastic, muscular organ that holds urine until it leaves the body through the urethra |
| urethra | tube that carries urine from the bladder to the outside of the body |