| A | B |
|---|
| aerobic respiration | uses oxygen to release energy from glucose |
| alveolus | where gas exchange occurs |
| capillary | allows transfer of substances between the blood and tissues |
| circulatory system | The system that moves blood through the body. |
| diffusion | movement of particles from a high concentration to low concentration |
| excretion | The removal of waste materials |
| gas exchange | A process in which one gas diffuses across a membrane and another gas diffuses in the opposite direction |
| metabolism | All the chemical reactions that occur in an organism. |
| (SA : V) ratio | The total amount of surface area of an object divided by its volume. |
| urea | A waste product made in the liver from excess amino acids. |
