$$\text{NFP} = \text{HP}_{\text{gc}} - (\text{HP}_{\text{cs}} + \text{OP}_{\text{gc}})$$

$$\text{Osmolality} = \frac{\text{number of solute particles}}{1\,\text{kg of H}_2\text{O}}$$

Question 1

Which of the following is the primary function of the kidneys in maintaining the body's internal environment?

Accepted Answer

Regulating total water volume and solute concentration

Question 2

The filtration slits shown in the first image are formed by which cell type in the glomerular capsule?

Accepted Answer

Podocytes

Question 3

Which layer of the supportive tissue surrounding the kidney acts as a fatty cushion?

Accepted Answer

Perirenal fat capsule

Question 4

A patient presents with high blood glucose levels and glucose in the urine. Which concept explains why glucose appears in the urine?

Accepted Answer

Transport maximum (Tm) for glucose is exceeded

Question 5

Which of the following equations correctly represents the net filtration pressure (NFP) in the glomerulus?

Accepted Answer

$$	ext{NFP} = 	ext{HP}_{	ext{gc}} - (	ext{HP}_{	ext{cs}} + 	ext{OP}_{	ext{gc}})$$

Question 6

Which of the following is NOT a function of the nephron's collecting duct?

Accepted Answer

Producing erythropoietin

Question 7

Which capillary bed is responsible for the formation of concentrated urine in juxtamedullary nephrons?

Accepted Answer

Vasa recta

Question 8

During dehydration, which hormone is released in maximal amounts to conserve water?

Accepted Answer

Antidiuretic hormone (ADH)

Question 9

Which of the following statements about glomerular filtration is TRUE?

Accepted Answer

It produces a cell- and protein-free filtrate

Question 10

A patient with chronic renal disease has a GFR of 50 ml/min. What is a likely consequence?

Accepted Answer

Accumulation of nitrogenous wastes in the blood

Question 11

Which of the following mechanisms is responsible for maintaining a constant GFR when mean arterial pressure (MAP) is between 80–180 mm Hg?

Accepted Answer

Renal autoregulation

Question 12

Which of the following is the correct sequence of urine flow from the renal pyramid to the ureter?

Accepted Answer

Renal pyramid → minor calyx → major calyx → renal pelvis → ureter

Question 13

Which of the following is a consequence of increased GFR on systemic blood pressure?

Accepted Answer

Increased urine output and lowered blood pressure

Question 14

Which of the following is TRUE regarding the countercurrent multiplier in the nephron loop?

Accepted Answer

The descending limb is impermeable to solutes

Question 15

Which equation best describes osmolality in body fluids?

Accepted Answer

$$	ext{Osmolality} = \frac{	ext{number of solute particles}}{1\,	ext{kg of H}_2	ext{O}}$$

Question 16

Which of the following is NOT normally found in urine?

Accepted Answer

Glucose

Question 17

Which of the following events is required for micturition (urination) to occur in adults?

Accepted Answer

Opening of the internal urethral sphincter by the autonomic nervous system

Question 18

Which of the following is a risk factor for developing renal calculi (kidney stones)?

Accepted Answer

Obesity

Question 19

Which of the following is the main controllable factor determining glomerular filtration rate (GFR)?

Accepted Answer

Net filtration pressure (NFP)

The Urinary System: Structure and Function

Study Guide - Practice Questions