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Medicine LibreTexts

4.3B: Active Uptake/Transport

There are two forms of active uptake/transport:

  1. Active Carrier Transport
  2. Endocytosis

Active Carrier Transport

Active carrier transport is similar to facilitated diffusion in that it utilizes a protein (carrier). However, energy is also used to move compounds against their concentration gradient. The following figure and video do a nice job of illustrating active carrier transport.

Figure 4.321 Sodium-potassium ATPase (aka sodium-potassium pump) an example of active carrier transport1

Video: Active Transport

The ideal gas law is easy to remember and apply in solving problems, as long as you get the proper values a

Video: Active Transport

2. Endocytosis

Endocytosis is the engulfing of particles, or fluids, to be taken up into the cell. If a particle is endocytosed, this process is referred to as phagocytosis. If a fluid is endocytosed, this process is referred to as pinocytosis as shown below.

Figure 4.322 Different types of endocytosis2

The following video does a really nice job of showing how endocytosis occurs.

Web Link

Video: Endocytosis (0:35)