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They move via passive transport. They move by diffusion. It's only active transport if A) the cell is too big or not fatty enough to move through the membrane and needs help or B) is making the molecules move unnaturally (low to high). Osmosis is also passive transport, but only is used when referring to the movement of water.

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14y ago
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13y ago

Active transport. To go "upstream" requires ATP, a form of energy, to pump against the ion gradient.

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12y ago

well oxygen isn't a transport system it is something that can be diffused across the membranes of cells.

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12y ago

You could call it passive transport, but the correct term is diffusion. Osmosis where water is involved.

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11y ago

Passive (diffusion - along pressure gradient).

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11y ago

Passive transport moves molecules from a high to low concentration gradient.

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11y ago

Passive Transport-Diffusion

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12y ago

active transport.

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Q: Is oxygen a passive transport or an active transport?
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