4.3B: Active Uptake/Transport
- Page ID
- 1467
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There are two forms of active uptake/transport:
- Active Carrier Transport
- 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) |
References & Links
- en.Wikipedia.org/wiki/File:S...um_pump-en.svg
- commons.wikimedia.org/wiki/Fi...osis_types.svg
Videos
Active Transport - http://www.youtube.com/watch?v=STzOiRqzzL4
Endocytosis - http://www.youtube.com/watch?v=4gLtk8Yc1Zc