Human Excretory System Part 1 1. Physiologically urea is produced by the action of an enzyme a. Uricase b. Urease c. Arginase d. None 2. Glomeruli are mainly confined to a. Cortex b. Medulla c. Pelvis d. Pyramid 3. Blood fraction remaining unchanged after circulation through kidney is a. Urea and uric acid b. Urea and proteins c. Urea and glucose d. Glucose and proteins 4. The most important function of the mammalian kidney is the a. Control of reproduction b. Regulation of amount of protein in the blood c. Control of amount of protein in the blood d. Regulation of osmotic concentration of body fluid 5. Which of these is not a general function of the kidney? a. Regulation of blood volume b. Regulation of vitamin-A synthesis c. Regulation of solute concentration in the blood d. Regulation of the PH of the extracellular fluid 6....