Question 1

Which of the following is NOT a function of the kidneys in maintaining the body's internal environment?

Accepted Answer

Synthesizing insulin for glucose uptake

Question 2

A patient presents with chronic hypertension. Which renal hormone is most directly involved in blood pressure regulation?

Accepted Answer

Renin

Question 3

Which structure in the nephron is primarily responsible for the filtration of blood?

Accepted Answer

Glomerulus

Question 4

The net filtration pressure (NFP) in the glomerulus is calculated using which formula?

Accepted Answer

$NFP = HP_{gc} - (HP_{cs} + OP_{gc})$

Question 5

Which of the following pressures promotes filtration in the glomerulus?

Accepted Answer

Hydrostatic pressure in the glomerular capillaries ($HP_{gc}$)

Question 6

A decrease in blood pressure below 80 mm Hg triggers which response in the kidneys?

Accepted Answer

Extrinsic controls override intrinsic mechanisms

Question 7

Which cells in the juxtaglomerular complex act as chemoreceptors monitoring NaCl content in the filtrate?

Accepted Answer

Macula densa cells

Question 8

What is the primary effect of angiotensin II in the regulation of blood pressure?

Accepted Answer

Stimulation of aldosterone release and vasoconstriction

Question 9

Which part of the nephron is most responsible for reabsorbing the majority of water, glucose, and amino acids from the filtrate?

Accepted Answer

Proximal convoluted tubule

Question 10

A patient is experiencing metabolic acidosis. Which cells in the collecting duct help maintain acid-base balance?

Accepted Answer

Intercalated cells

Question 11

Which of the following best describes the flow of urine from the renal pyramids to the bladder?

Accepted Answer

Papilla → Minor calyces → Major calyces → Renal pelvis → Ureter → Bladder

Question 12

Which of the following is TRUE regarding glomerular filtration?

Accepted Answer

It is a passive process driven by hydrostatic pressure

Question 13

Which of the following would most likely result in a decrease in glomerular filtration rate (GFR)?

Accepted Answer

Constriction of afferent arteriole

Question 14

Which equation correctly represents the relationship between glomerular filtration rate (GFR) and net filtration pressure (NFP)?

Accepted Answer

$GFR \propto NFP$

Question 15

Which of the following is a consequence of loss of plasma proteins in the urine?

Accepted Answer

Decreased colloid osmotic pressure, leading to excessive loss of plasma water

Question 16

Which of the following mechanisms is responsible for the kidneys' ability to maintain a stable GFR despite normal fluctuations in blood pressure?

Accepted Answer

Intrinsic autoregulation (myogenic and tubuloglomerular feedback)

Question 17

A patient with severe blood loss is experiencing hypovolemic shock. What is the expected renal response?

Accepted Answer

Sympathetic nervous system constricts afferent arterioles, decreasing GFR

Question 18

Which of the following best describes the role of the vasa recta in the kidney?

Accepted Answer

Reabsorption of water and solutes, aiding in the formation of concentrated urine

Question 19

Which route do substances follow during passive tubular reabsorption in the nephron?

Accepted Answer

Either transcellular or paracellular route

Question 20

Which of the following is a direct effect of aldosterone on the nephron?

Accepted Answer

Increased sodium reabsorption in the distal convoluted tubule and collecting duct

Chapter 25: The Urinary System – Structure and Function

Study Guide - Practice Questions