level: Gas exchange and transport
Questions and Answers List
level questions: Gas exchange and transport
| Question | Answer |
|---|---|
| Define capillaries | Capillaries are blood vessels. They transport blood, nutrients and oxygen to cells in your organs and body systems. |
| Define alveoli | Air sacs at the end of the bronchioles. The alveoli are where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out. |
| What are bronchioles? | A tiny branch of air tubes in the lungs. |
| Define gas exchange | The physical process by which gases move passively by diffusion across a surface. |
| Define haemoglobin | A protein of red blood cells that contains iron and carries oxygen from the lungs to the tissues and carbon dioxide from the tissues to the lungs. |
| What common features do structures involved with gas exchange have? | Large surface area relative to the volume of the organism. Thin (have a short diffusion pathway) A moist surface (so gases can dissolve first before they diffuse in or out) |