Support Us

If you found our community helpful, your small donation will help us reach more students around the globe. You may also like us on Facebook or follow us on Twitter.
New Topic  
wrote...
*
*
Posts:
16058
Credits:
3543
4 years ago
How can more molecules be transported into areas with high concentrations of the molecule?

Cells often need to create concentration gradients across membranes. The concentration of a molecule is much higher on one side of the membrane than the other when a concentration gradient exists. In order to create or maintain a concentration gradient, individual molecules must be moved from an area of low concentration to an area of high concentration. This cannot occur through passive diffusion, in fact diffusion will cause the gradient to break down. Only active transport, which requires both specialized transport molecules and the expenditure of energy can drive molecules up a concentration gradient. The sodium potassium pump is an important and well understood example of active transport.

<span class="round5px midtext hidden">Hidden Link - <a style="font-weight: bold;" href="http://biology-forums.com/index.php?action=login">Login</a> or <a style="font-weight: bold;" href="http://biology-forums.com/index.php?action=register">Register</a></span>
Attached file
  • Read 995 times
✓ Why won't you follow us on Twitter? Small Smiley
New Topic      
This topic is currently locked from adding new posts. Only administrators and moderators can reply. If you'd like to contribute to this topic, start a new thread and make reference to this one. Otherwise, contact a moderator for more options.

Control Panel

Click to ask a question. 122 Students and 5 members are standing by to answer all your science and biology homework problems, free.
Dictionary
Search Images
Related Images
Views
391
Rating

Views
73
Rating

Views
880
Rating