When substances move through a plasma membrane and down gradients of concentration, this is called:

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Quizplus · Accepted Answer

Passive transport refers to the movement of substances through a membrane down their concentration gradient without the input of energy. Active transport, on the other hand, requires energy to move substances against their concentration gradient. Pinocytosis refers to the process of bringing fluid and dissolved particles into a cell by engulfing them in small vesicles, while exocytosis is the process of releasing substances from a cell by fusing vesicles containing the substance with the plasma membrane.

When Substances Move Through a Plasma Membrane and Down Gradients