Question

what controls the water permeability of collecting ducts in the kidney???

Answer 1

Aquaporins (specifically aquaporin II) are water-channel proteins found in collecting ducts. Their expression is under hormonal control.

Answer 2

so are aquaporins a hormone?

Answer 3

No. They're channel proteins that facilitate water diffusion across membranes. Aquaporin II, found in collecting ducts, is under the control of ADH (Anti Diuretic Hormone).

Answer 4

but i need a name of a chemical messenger :S

Answer 5

ADH (aka Vasopressin) is a chemical messenger. It's released by the Anterior pituitary.

Answer 6

I mean posterior pituitary

Answer 7

thanks

Answer 8

no problem