Question 1

Which of the following best describes the process of glomerular filtration in the nephron?

Accepted Answer

Passive movement of water and solutes from the glomerular capillaries into Bowman’s capsule

Question 2

Given the following pressures in the glomerulus: glomerular hydrostatic pressure ($$HP_{gc} = 55\ mmHg$$), glomerular colloid osmotic pressure ($$OP_{gc} = 30\ mmHg$$), and capsular hydrostatic pressure ($$HP_{bc} = 15\ mmHg$$), what is the net filtration pressure (NFP)?

Accepted Answer

$$NFP = HP_{gc} - (OP_{gc} + HP_{bc}) = 55 - (30 + 15) = 10\ mmHg$$

Question 3

Which segment of the nephron is primarily responsible for the reabsorption of glucose and amino acids?

Accepted Answer

Proximal convoluted tubule

Question 4

What effect does constriction of the afferent arteriole have on glomerular filtration rate (GFR)?

Accepted Answer

It decreases GFR by reducing blood flow into the glomerulus

Question 5

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

Accepted Answer

Antidiuretic hormone (ADH)

Question 6

A patient with central diabetes insipidus is likely to experience which of the following symptoms?

Accepted Answer

Polyuria and polydipsia due to lack of ADH production

Question 7

Which of the following is NOT a typical component of glomerular filtrate?

Accepted Answer

Plasma proteins

Question 8

What is the primary function of the juxtaglomerular apparatus (JGA)?

Accepted Answer

Regulation of glomerular filtration rate and blood pressure

Question 9

Which process describes the movement of substances from the peritubular capillaries into the renal tubule?

Accepted Answer

Secretion

Question 10

If a patient has hyperkalemia, which of the following is a likely consequence?

Accepted Answer

Increased membrane potential, leading to muscle weakness and arrhythmias

Question 11

Which of the following best describes the countercurrent multiplier system in the nephron?

Accepted Answer

It maintains the medullary osmotic gradient by active transport of sodium in the ascending limb of the loop of Henle

Question 12

Which hormone inhibits sodium reabsorption in the nephron, thereby increasing urine output?

Accepted Answer

Atrial natriuretic peptide (ANP)

Question 13

What is the typical value for glomerular filtration rate (GFR) in a healthy adult?

Accepted Answer

$$GFR = 120-125\ mL/min$$

Question 14

Which of the following would most likely be found in the urine of a patient with diabetes mellitus?

Accepted Answer

Glucose and ketones

Question 15

During micturition, which nervous system is primarily responsible for contraction of the detrusor muscle?

Accepted Answer

Parasympathetic nervous system

Question 16

Which of the following is a direct effect of angiotensin II (ANGII) on the kidneys?

Accepted Answer

Increases sodium reabsorption in the proximal tubule

Question 17

A patient with a kidney stone (renal calculi) is most likely to experience which of the following symptoms?

Accepted Answer

Severe pain and hematuria

Question 18

Which segment of the nephron is responsible for creating the medullary osmotic gradient?

Accepted Answer

Loop of Henle

Question 19

If a substance is filtered at the glomerulus but not reabsorbed, what is its path through the kidney?

Accepted Answer

Aorta → Renal artery → Glomerulus → Bowman’s capsule → PCT → DLoH → ALoH → DCT → CD → Minor calyx → Major calyx → Renal pelvis → Ureter → Urinary bladder → Urethra → Toilet

The Urinary System II: Filtration, Reabsorption, Secretion, and Regulation

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