Question

what is the use of renin

Answer 1

Renin's primary function is therefore to eventually cause an increase in blood pressure, leading to restoration of perfusion pressure in the kidneys. Renin is secreted from juxtaglomerular kidney cells, which sense changes in renal perfusion pressure, via stretch receptors in the vascular walls.

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Answer 2

renin is only produced in young children or in calfs to digest milk proteins