| A | B |
|---|
| nephrons | tiny filtering units found in the outer layer of the kidney |
| sweat glands | small coiled tubes that end at pores on the skin's surface |
| perspiration | another name for sweat |
| excretory system | the system for ridding the body of harmful wastes produced by the cells |
| skin | releases extra water, salt, and wastes as perspiration |
| lungs | remove carbon dioxide and water during exhalation |
| ureter | tube that carries urine from the kidney to the bladder |
| urethra | tube through which urine passes out of the body |
| oil gland | helps keep skin waterproof |
| urine | the yellowish liquid containing wastes and water from the filtering units of the kidneys |
| bladder | flexible bag that holds urine until it is released |
| sweating | the release of water, salts, and wastes through pores in the skin |
| pore | an opening in the skin through which sweat and oil to the skin's surface |
| kidneys | a pair of organs that clean and filter the blood |
