Question 1

Which of the following best describes the primary function of the kidneys in the urinary system?

Accepted Answer

To filter blood, remove wastes, and regulate fluid and electrolyte balance

Question 2

Which structure is responsible for carrying urine from the kidneys to the urinary bladder?

Accepted Answer

Ureter

Question 3

A patient presents with a decrease in glomerular filtration rate (GFR). Which of the following could directly cause this decrease?

Accepted Answer

Decreased hydrostatic pressure in the glomerulus

Question 4

Which equation correctly represents the calculation of net filtration pressure (NFP) in the glomerulus?

Accepted Answer

$$NFP = P_{GC} - (P_{BC} + \pi_{GC})$$

Question 5

Which hormone increases water reabsorption in the collecting ducts by increasing the number of aquaporins?

Accepted Answer

Antidiuretic hormone (ADH)

Question 6

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

Accepted Answer

Juxtamedullary nephrons have longer loops of Henle that extend deep into the medulla

Question 7

A patient is given a drug that inhibits the renin-angiotensin-aldosterone system (RAAS). What is the most likely effect on blood pressure and GFR?

Accepted Answer

Blood pressure decreases and GFR decreases

Question 8

Which of the following is NOT a function of the urinary bladder?

Accepted Answer

Concentration of urine

Question 9

Which process in the nephron is primarily responsible for moving substances from the blood into the tubular fluid for excretion?

Accepted Answer

Tubular secretion

Question 10

A urine sample is found to have a high specific gravity and low pH. Which condition is most likely indicated by these findings?

Accepted Answer

Dehydration

Question 11

Which of the following best describes the micturition reflex?

Accepted Answer

An involuntary spinal reflex that causes the bladder to contract and the internal urethral sphincter to relax

Question 12

Which of the following substances is NOT normally found in significant amounts in healthy urine?

Accepted Answer

Glucose

Question 13

Which of the following best explains why the renal medulla is hyperosmotic compared to the cortex?

Accepted Answer

The countercurrent multiplier system in the loops of Henle

Question 14

If the afferent arteriole constricts while the efferent arteriole remains unchanged, what will happen to the glomerular filtration rate (GFR)?

Accepted Answer

GFR will decrease

Question 15

Which of the following is the correct sequence for the flow of filtrate through the nephron?

Accepted Answer

Bowman's capsule → proximal convoluted tubule → loop of Henle → distal convoluted tubule → collecting duct

Question 16

Which of the following best describes the effect of atrial natriuretic peptide (ANP) on the kidneys?

Accepted Answer

Decreases sodium reabsorption and increases urine output

Question 17

A patient with uncontrolled diabetes mellitus is found to have glucose in their urine. Which process in the nephron has been overwhelmed?

Accepted Answer

Tubular reabsorption

Question 18

Which of the following best explains why females are more prone to urinary tract infections (UTIs) than males?

Accepted Answer

Females have a shorter urethra

Question 19

Which of the following is a correct statement about the renal clearance of a substance?

Accepted Answer

It is the volume of plasma from which the substance is completely removed by the kidneys per unit time

Question 20

Which of the following best describes the role of the collecting duct in urine formation?

Accepted Answer

It adjusts the final concentration and volume of urine under hormonal control

Chapter 24: The Urinary System - Study Notes

Study Guide - Practice Questions