Secondary active transport

[podyon18]

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After a gradient is created during 2ary active - do the molecules then use a carrier? channel?

For example-
Na/K pumps in enterocytes create a gradient by pumping Na into the intestine.
Glucose and Na then move out together down the Na gradient.

How do glucose and Na move out the intestine and into the enterocyte ofafter the gradient is created?
Through a channel? carrier? what kind?

Thanks you!!

 

[Littlet]

This is accomplished through a Na/Glucose symporter system, which is a channel that draws glucose into the enterocyte against its gradient along with sodium, which is going down its gradient that was previously established.

 

[podyon18]

Thanks! - one more q

how do Large Hydrophobic/polar molecules get through the membrane?
I havent been able to find an answer for this anywhere!

 

[MedPR]

Thanks! - one more q

how do Large Hydrophobic/polar molecules get through the membrane?
I havent been able to find an answer for this anywhere!

Channels and endocytosis.