Answer :
27. Blood calcium levels are controlled by hormones from which structure?
C. Parathyroid glands and the anterior lobe of the pituitary gland.
28. Where are all of the glomeruli of the kidney located?
B. Cortex
29. What structure does the blood from the afferent arteriole enter?
B. Glomerulus
30. Which part of the nephron is impermeable to water?
A. Ascending limb of the loop of Henle
31. Which material is actively reabsorbed from the filtrate in the kidney tubule?
D. Na+
32. Which material is secreted into the filtrate in the kidney tubule?
D. Urea
33. Which one of the following is NOT produced by the kidneys?
A. Aldosterone