Question 1

Which of the following is NOT a primary function of the urinary system?

Accepted Answer

Production of digestive enzymes

Question 2

A patient presents with high blood pressure and low blood osmolarity. Which function of the kidneys is most directly responsible for correcting both of these abnormalities?

Accepted Answer

Regulation of plasma concentrations and blood volume

Question 3

Which structure is the first to receive urine after it leaves the papillary duct in the kidney?

Accepted Answer

Minor calyx

Question 4

A blockage in the efferent arteriole of a nephron would most directly affect which of the following?

Accepted Answer

Blood flow into the peritubular capillaries or vasa recta

Question 5

Which of the following best describes the role of the juxtaglomerular complex in kidney function?

Accepted Answer

It regulates blood pressure by releasing renin.

Question 6

A patient with chronic kidney disease has reduced erythropoietin (EPO) production. What is the most likely consequence?

Accepted Answer

Anemia due to decreased red blood cell production

Question 7

Which of the following sequences correctly traces the path of blood flow through the nephron?

Accepted Answer

Afferent arteriole → Glomerulus → Efferent arteriole → Peritubular capillaries

Question 8

Which type of nephron is primarily responsible for producing concentrated urine, and why?

Accepted Answer

Juxtamedullary nephrons, because their long loops extend deep into the medulla

Question 9

If the macula densa detects a decrease in sodium chloride concentration in the distal convoluted tubule, what is the expected response?

Accepted Answer

Juxtaglomerular cells release renin to increase blood pressure

Question 10

Which of the following best explains why the kidneys are able to regulate blood pH?

Accepted Answer

They secrete hydrogen ions ($$\mathrm{H^+}) $$and reabsorb bicarbonate ($$\mathrm{$$HCO_3$$^-}) in $$the renal tubules.

Question 11

A patient is found to have glucose in their urine (glycosuria). Which part of the nephron is most likely malfunctioning?

Accepted Answer

Proximal convoluted tubule (PCT)

Question 12

Which of the following tissues is NOT commonly found in the urinary system?

Accepted Answer

Cardiac muscle

Question 13

A patient with a tumor compressing the renal pelvis would most likely experience which of the following symptoms?

Accepted Answer

Obstruction of urine flow from the kidney to the ureter

Question 14

Which of the following best describes the function of the collecting duct in the nephron?

Accepted Answer

It adjusts the final concentration of urine by reabsorbing water under the influence of antidiuretic hormone (ADH).

Question 15

Which of the following is the correct order of structures that urine passes through from the nephron to the outside of the body?

Accepted Answer

Collecting duct → Papillary duct → Minor calyx → Major calyx → Renal pelvis → Ureter → Urinary bladder → Urethra

Question 16

A patient is dehydrated and their blood osmolarity is elevated. Which hormone is most likely to be secreted to correct this, and what is its effect on the collecting duct?

Accepted Answer

Antidiuretic hormone (ADH); increases water reabsorption

Question 17

Which of the following best explains why the glomerulus is a high-pressure capillary bed?

Accepted Answer

The afferent arteriole has a larger diameter than the efferent arteriole, increasing pressure in the glomerulus.

Question 18

Which of the following best describes the function of intraglomerular mesangial cells?

Accepted Answer

They regulate glomerular filtration by altering capillary surface area.

Question 19

A patient with a genetic defect in the smooth muscle of their ureters would most likely experience which of the following?

Accepted Answer

Impaired peristalsis leading to urine retention in the kidneys

Question 20

Which of the following best explains the difference between cortical and juxtamedullary nephrons?

Accepted Answer

Juxtamedullary nephrons have longer nephron loops that extend deep into the medulla, allowing for greater water reabsorption.

Anatomy and Physiology of the Urinary System

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