Question

Where in the nephron does filtration occur? A Proximal convoluted tubule B. Distal convoluted tubule C. Loop of Henle D. Collecting duct E. None of the above 10. Which is NOT true about the lymph atic system? Check all that apply. A. it returns fluids to the blood B. it fights infection C. it carries fats to the blood D. it returns proteins to the blood E. it has a pump to circulate the lymph AB. all of the above are true 11. In the human urinary/excretory system, there are two: Check all that apply. A. nephrons B. ureters C. collecting ducts D. kidneys E. urethras 12. Which cannot be considered an antigen? Check all that apply. A. a foreign protein or cell B. an antibody C. something you are allergic to D. a transplanted organ E. all of these are antigens

Answer 1

9. The correct option is E.

Filtration of the blood plasma occurs in the glomerular capsule. Glomerulus is the capillary network of the renal corpuscle which is surrounded by a double-walled epithelial cup called the glomerular capsule. The filtered fluid then passes into the renal tubule that is composed of the proximal convoluted tubule (PCT), the loop of Henle and the distal convoluted tubule (DCT).

Option A, B, C and D cannot be correct because these structures play a role in tubular reabsorption (absorption of water and useful solutes from the filtered fluid) and tubular secretion (secretion of wastes and excess ions into the filtered fluid). Besides this, the PCT, DCT, loop of Henle and the colleting ducts regulate the production of concentrated or dilute urine to maintain the homeostasis of body fluids.