Question

Is secondary active transport considered as passive transport??

As sodium on one side has a higher concentration, and travels back down to the lower concentration and brings glucose with it too

So it is from high -> low, then is it kind of like passive transport?

Answer 1

Im pretty sure it has a classification of its own, "Facilitated diffusion"

Answer 2

There is some good explanations here.
http://www.physiologyweb.com/lecture_notes/membrane_transport/facilitated_diffusion.html

Answer 3

but secondary active transport s also a classification..
and my notes says using electrochemical to transport molecules

Answer 4

I might be mixing things up then.

Answer 5

diffusion is passive transport
as Na travels back down to the lower concentration Na in the cell through channel proteins, it requires no energy (ATP) input to cross the PBL and therefore is considered passive.

Answer 6

but i'm asking about secondary active transport..

Answer 7

any energy input is not considered passive

Answer 8

I think secondary active transport can go on its own, but is juz not fast enough, so then energy is required? why will energy be required if it is moving from high to low

Answer 9

and in secondary active transport, there is no site to bind ATP, so unless it uses sodium , or glucose as energy

Answer 10

the girl across from me is confused.

Answer 11

lol ==

Answer 12

summoning blues!! xD

Answer 13

Come to think of it, how would a glucose fit through a sodium pump...

Answer 14

glucose doesnt go through sodium pump , but i think is faciliated diffusion, thru channel protein

Answer 15

sodium pump is for sodium and potassium

Answer 16

As I know it this is how it works, it is called "active transport" as it needs the electrochemical gradient produced by the ion-pump (also called the sodium-potassium pump). Its called "Secondary" as it doesn't actually do the pumping of the sodium-potassium pump BUT it cannot exist without the electrochemical gradient produced by the sodium-potassium pump so it isn't considered passive.

In short: the sodium-potassium pump uses energy (in the form of ATP) and secondary transport relies upon this.