<prompt> Proteolytic enzyme Renin is present in?LungsKidneyLiverStomach  <response>: ANSWER: B KidneyREF: Guyton 11th ed page 223, Grays anatomy 39th ed page 1192Indirect repeat Physiology 2003Renin is a protein enzyme released by the kidneys when the arterial pressure falls too low. Renin itself is an enzyme, not a vasoactive substance. Renin acts enzymatically on another plasma protein, a globulin called renin substrate or angiotensinogen, to release a 10-amino acid peptide, angiotensin I. Hence it is a proteolytic enzyme, 