The movement of oxygen from the alveoli of the lungs into the bloodstream is an example of

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The movement of oxygen from the alveoli of the lungs into the bloodstream is an example of diffusion, as it occurs down a concentration gradient - from an area of high concentration (the alveoli) to an area of lower concentration (the blood). Osmosis involves the movement of water across a selectively permeable membrane, while active transport and facilitated diffusion both require the input of energy to move substances across a membrane. Bulk transport involves the movement of larger molecules or particles, such as through endocytosis or exocytosis.

The Movement of Oxygen from the Alveoli of the Lungs