| A | B |
|---|
| elastic, muscular organ that holds urine until it leaves the body through the urethra | bladder |
| tube that carries urine from each kidney to the bladder | ureter |
| tiny filtering unit of the kidney | nephrons |
| tiny, grape-like clusters at the end of each bronchiole where CO2 and O2 are exchanged | alveoli |
| two short tubes that branch off the lower end of the trachea that carry air into the lungs | bronchi |
| air-conduction tube that connects the larynx with the bronchi | trachea |
| airway to which the vocal cords are attached | larynx |
| inorganic nutrient that regulates many chemical reactions in the body | minerals |
| organic nutrient needed in small quantities for growth, preventing some diseases, and regulating body functions | vitamins |
| nutrients that usually are the body’s main souce of energy | carbohydrates |
| building block of protein | amino acids |
| finger-like projections covering the wall of the small intestine | villi |
| liquid product of digestion | chyme |
| waves of muscular contractions that move food through the digestive tract | peristalsis |
| a type of protein that speeds up chemical reactions | enzyme |
| substance in foods that provide energy | nutrients |
