| A | B |
|---|
| alveolus | a tiny air sac where gas exchange occurs |
| trachea | the tube that carries air to the bronchi |
| diaphragm | the muscle below the lungs that controls breathing |
| perspiration | liquid waste released through the skin |
| kidney | the organ in the excretory system where urine forms |
| ureter | a tube that carries urine from a kidney to the urinary bladder |
| urethra | the tube that carries urine out of the body |
| penis | the male organ that delivers sperm to the female's body |
| scrotum | the exterior sac that holds the testes |
| testis | the male reproductive organ that produces sperm cells |
| vagina | the tube like canal in the female body through which sperm enter the body |
