Passive transport doesn’t require an outside energy source. Materials move directly in and out of cell membranes as in the case of osmosis. Examples include putting salt on a slug (the salt moves directly into the slug’s cells, killing it) or oxygen moving from a place of high concentration into a cell where there is low oxygen concentration. Active transportation requires energy. Some examples are: the stomach secreting acid (H+ ions), fish gill cells pumping salt out of its body and into the water, and human intestinal cells taking in glucose.
involves carriers, channels, or direct diffusion through a membrane. This type of transport always operates from regions of greater concentration to regions of lesser concentration. No external energy source is required.
Examples are:Simple diffusion, channel diffusion, and facilitated diffusion
Active Transport is when cells must move materials in an opposite direction – against a concentration gradient. THis requires energy. Protein pumps found in the cell membrane transport molecules across the membrane.
Basically Passive transport moves from greater concentration to lesser concentration – like air coming out of a balloon. Active transport is when the balloon must be blown back up, it takes additional energy.
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