Active transport mechanisms can be divided into two categories. Primary active transport directly uses a source of chemical energy (e.g., ATP) to move molecules across a membrane against their gradient.

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_图像修改自“ Active transport: Figure 4 ”，OpenStax College, Biology (CC BY 3.0) 和“ Scheme secondary transport ” ，由Mariana Ruiz Villareal 创作（公共领域）_

During active transport, substances move against the concentration gradient, from an area of low concentration to an area of high concentration. This process is “active” because it requires the use of …

Transporte activo (24 de junio de 2016). Obtenido el 21 de julio de 2016 de Wikipedia: https://en.wikipedia.org/wiki/Active_transport#Primary_active_transport .

Transport that directly uses ATP for energy is considered primary active transport. In this case, that’s moving sodium from a concentration of 10mM to one of 145 mM.

Active transport describes the use of energy to move molecules across a cell membrane, usually against their concentration gradients. Membrane proteins involved in active transport include symporters, …

No, it is not active transport. All it needs is the proximity of certain cell/object/particle to the cell, and all that happens is fusing with the membrane.

Active transport moves substances against a gradient using energy, unlike passive transport which does not require energy.

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