Dictionary » A » Active transport

Active transport

Definition

noun

A kind of transport wherein ions or molecules move against a concentration gradient, which means movement in the direction opposite that of diffusion – or – movement from an area of lower concentration to an area of higher concentration. Hence, this process will require expenditure of energy, and the assistance of a type of protein called a carrier protein.


Supplement

The movement of a substance across a membrane from a region of its lower concentration to a region of its higher concentration against a concentration gradient, using energy. This energy is supplied through respiration using ATP. Mitochondria ( cell organelles in the cytoplasm) control energy release. Respiratory poisons block energy release, so they can prevent active transport.

Common sites of active transport are root hair cells the wall of small intestine(villi).


Compare: passive transport, diffusion.
See also: concentration gradient.


Please contribute to this project, if you have more information about this term feel free to edit this page



Results from our forum


Bio Research Paper Writing

... viral infections on telomere function. Normally, telomerase isn’t active in most cells (which is an evolutionary advantage against cancer) ... reticulum molecule called Viperin (CMV-Vipirin). This results in the transport of viperin to the mitochondria where viperin interacts with mitochondrial ...

See entire post
by NathanielZhu
Thu Apr 04, 2013 2:25 am
 
Forum: General Discussion
Topic: Bio Research Paper Writing
Replies: 1
Views: 8094

Re: Compare and Contrast Active and Passive Transport?

In active transport mollecules or ions move from at the region of lower concentration to the region of higher concentration ...

See entire post
by kumar985
Sun Nov 18, 2012 9:12 am
 
Forum: Cell Biology
Topic: Compare and Contrast Active and Passive Transport?
Replies: 6
Views: 10409

Compare and Contrast Active and Passive Transport?

active transport does not have to go against conc. gradient, theoretically.

See entire post
by JackBean
Sat Nov 10, 2012 11:24 am
 
Forum: Cell Biology
Topic: Compare and Contrast Active and Passive Transport?
Replies: 6
Views: 10409

Compare and Contrast Active and Passive Transport?

active transport involves usage of ATP molecules \passive transport does not. active transport takes place against conc.gradient\it ...

See entire post
by super17
Sat Nov 10, 2012 7:49 am
 
Forum: Cell Biology
Topic: Compare and Contrast Active and Passive Transport?
Replies: 6
Views: 10409

Re: Compare and Contrast Active and Passive Transport?

Nice surprise about this shorter form. Can you tell us what it is you are talking/writing about? Has any info. about this shorter form been posted before (and i just missed it)?

See entire post
by angileena
Sat Nov 10, 2012 6:47 am
 
Forum: Cell Biology
Topic: Compare and Contrast Active and Passive Transport?
Replies: 6
Views: 10409
View all matching forum results

This page was last modified 14:06, 21 May 2011. This page has been accessed 323,431 times. 
What links here | Related changes | Permanent link