A Question To Check if you are going to flunk step 1 or not.

[Anonymous]

What stimulates the release of renal renin?

[mjl1717]

Decreased renal perfusion pressure causes renin release from the JG cells of the afferent arteriole. If anyone wants to add to this answer be my guest.

[paweljarmuziewicz]

also stimulate: low supply of K+, low level of Na+ angiotensin or aldosterone in blood, low blood volume (relase depend on central veins receptors), symphatetic nervous system
correct me if I'm wrong