Question

Choose the odd one out.
diffusion, respiratory gases, alveoli, capillary network.

Answer 1

Capillaries, the smallest and most numerous of the blood vessels, form the connection between the vessels that carry blood away from the heart (arteries) and the vessels that return blood to the heart (veins). It is a part of the Circulatory System.

Diffusion is the spontaneous movement of gases, without the use of any energy or effort by the body, between the alveoli and the capillaries in the lungs.

The air we breathe: three vital respiratory gases and the red blood cell: oxygen, nitric oxide, and carbon dioxide.

Alveoli are tiny air sacs in the lungs that take up the oxygen you breathe in and keep your body going.

So,odd one out is capillary network.