Q: What are the narrowest blood vessels, where oxygen is transferred into body cells?


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

Red blood cells are flat, round, and very small. Their small size allows easy maneuverability through the capillaries, the narrowest blood vessels, where oxygen is transferred into body cells.

 Choices:

- arteries

- muscles

- viens

- capillaries


A:
capillaries