Q: How is oxygen transferred into the bloodstream?


Read this paragraph and choose the correct option from the provided answers:

The oxygen enters the bloodstream from the alveoli , tiny sacs in the lungs where gas exchange takes place ( Figure below ). The transfer of oxygen into the blood is through simple diffusion.

 Choices:

- mean diffusion

- hard diffusion

- brain diffusion

- simple diffusion


A:
simple diffusion