Can anyone throw some light on active transport? need urgent help.
Thanks in advance
Well I'll start off by just saying active transport is the transportation of particles requiring energy. This energy can come from chemical sources or electrochemical sources. Situations that would require active transport include: moving particles against the concentration gradient, or moving particles into a cell where the cell membrane is normally impermeable to the particle. Both of these are examples of active transport and are mediated by specialized membrane proteins called: transport proteins.
The concentration gradient is created by the uneven concentrations from within the cell to outside the cell.
If you need to know anything else more specific just let me know.
Example of an active transport (in the physical realm)
*Driving a car up a hill
*Rolling a ball up a hill
*Riding a bike up a hill
*Sailing against the wind
Examples of passive transport
*Rolling a car down a hill
*Rolling a ball down a hill
*Riding a bike down a hill
*Sailing with the wind and only letting the wind take you.
See the differences? Active transport is the movement of molecules that requires energy. Passive is the movement where energy is not required. Often times chemicals and hormones are pumped by "gateways" through cells. This is active transport.
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