Question 1

Which of the following best describes the main function of glomerular filtration in the nephron?

Accepted Answer

It filters blood, allowing water and small solutes to enter the glomerular capsule while retaining larger molecules in the blood.

Question 2

Which structure acts as the finest filter in the filtration membrane, preventing albumin from entering the filtrate?

Accepted Answer

Podocytes

Question 3

A patient with chronic hypertension has increased glomerular hydrostatic pressure. Predict the effect on glomerular filtration rate (GFR).

Accepted Answer

GFR will increase due to increased filtration pressure.

Question 4

Which of the following is a correct sequence of events in the renin-angiotensin-aldosterone system (RAAS) following a drop in blood pressure?

Accepted Answer

Renin release → Angiotensinogen to Angiotensin-I → ACE converts to Angiotensin-II

Question 5

Which of the following best explains why glucose appears in the urine of a patient with uncontrolled diabetes mellitus?

Accepted Answer

The transport maximum ( $$T_M ) $$for glucose reabsorption is exceeded, so excess glucose remains in the filtrate.

Question 6

Which of the following is NOT a function of tubular secretion?

Accepted Answer

Reclaiming water and solutes from the filtrate

Question 7

A patient is given a drug that blocks the action of antidiuretic hormone (ADH). What will be the expected effect on urine?

Accepted Answer

Urine volume will increase and urine will become more dilute.

Question 8

Which of the following mechanisms is responsible for establishing the medullary osmotic gradient in the kidney?

Accepted Answer

All of the above

Question 9

If the afferent arteriole constricts while the efferent arteriole dilates, what will happen to the GFR?

Accepted Answer

GFR will decrease

Question 10

Which of the following best describes the process of facilitated diffusion in renal tubular cells?

Accepted Answer

A carrier protein passively transports a solute with its concentration gradient, without using ATP.

Question 11

Which part of the nephron is primarily responsible for the reabsorption of most nutrients, including glucose and amino acids?

Accepted Answer

Proximal tubule

Question 12

A patient with chronic respiratory acidosis is likely to have which renal compensation?

Accepted Answer

Increased reabsorption of bicarbonate ions

Question 13

Which of the following is true regarding the permeability of the nephron loop?

Accepted Answer

The thin descending limb is permeable to water but not to solutes.

Question 14

Which hormone directly increases water reabsorption in the late distal tubule and collecting duct?

Accepted Answer

Antidiuretic hormone (ADH)

Question 15

Which of the following best explains why the kidneys produce dilute urine when the extracellular fluid (ECF) contains excess water?

Accepted Answer

ADH release is reduced, making the collecting duct less permeable to water.

Question 16

Which of the following is a direct effect of atrial natriuretic peptide (ANP) on the kidney?

Accepted Answer

Increase in GFR

Question 17

Which of the following best describes the role of the vasa recta in the countercurrent mechanism?

Accepted Answer

It maintains the medullary osmotic gradient by acting as a countercurrent exchanger.

Question 18

Which of the following is a consequence of reaching the transport maximum ($$T_M) $$for a solute in the nephron?

Accepted Answer

The solute will appear in the urine.

Question 19

Which of the following is a result of high levels of sympathetic stimulation during severe blood loss?

Accepted Answer

Constriction of both afferent and efferent arterioles, decreasing GFR

Question 20

Which of the following best describes the effect of alcohol on urine production?

Accepted Answer

Alcohol inhibits ADH release, resulting in increased urine volume and decreased urine concentration.

Renal System: Filtration, Reabsorption, and Regulation

Study Guide - Practice Questions