Question 1

Which of the following best describes the primary function of the nephron loop (loop of Henle) in the kidney?

Accepted Answer

It generates an osmotic gradient that enables the collecting duct to reabsorb water.

Question 2

A patient is severely dehydrated. Which hormone will be released to increase water reabsorption in the collecting duct, and what is the mechanism?

Accepted Answer

Antidiuretic hormone (ADH); stimulates the insertion of aquaporins into the collecting duct cells.

Question 3

Which of the following substances is primarily reabsorbed in the proximal convoluted tubule (PCT) by co-transport with sodium?

Accepted Answer

Glucose

Question 4

If the glomerular filtration rate (GFR) drops significantly, which of the following is a likely consequence?

Accepted Answer

Accumulation of metabolic wastes in the blood

Question 5

Which of the following best explains why the medullary portion of the collecting duct is more permeable to water than solutes?

Accepted Answer

The presence of aquaporins regulated by ADH

Question 6

A patient with high blood pressure is found to have increased secretion of natriuretic peptides. What effect will this have on the distal convoluted tubule (DCT)?

Accepted Answer

Decreased reabsorption of sodium and water

Question 7

Which of the following equations correctly represents the relationship for net filtration pressure (NFP) in the glomerulus?

Accepted Answer

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

Question 8

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

Accepted Answer

Reabsorption of glucose into the blood

Question 9

During which part of the nephron is the majority of water reabsorbed?

Accepted Answer

Proximal convoluted tubule (PCT)

Question 10

A patient is taking a drug that inhibits sodium-potassium pumps in the nephron. Which of the following is a likely effect?

Accepted Answer

Decreased reabsorption of sodium and water in the PCT

Question 11

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

Accepted Answer

It allows for the continuous recapture of salt and maintains a high osmolarity in the deep medulla.

Question 12

Which of the following scenarios would most likely result in the production of highly concentrated urine?

Accepted Answer

High levels of ADH and high medullary osmolarity

Question 13

Which of the following is TRUE regarding the micturition reflex?

Accepted Answer

It is initiated by stretch receptors in the bladder wall.

Question 14

Which of the following ions is secreted into the tubular fluid in exchange for sodium reabsorption in the distal convoluted tubule (DCT)?

Accepted Answer

Potassium ($$K^+)$$

Question 15

If a patient has a mutation that prevents the formation of aquaporins in the collecting duct, what would be the expected outcome?

Accepted Answer

Inability to concentrate urine, leading to excessive water loss

Question 16

Which of the following best explains why glucose is normally absent from urine?

Accepted Answer

It is completely reabsorbed in the proximal convoluted tubule via sodium-glucose co-transporters.

Question 17

Which of the following would most likely occur if the countercurrent multiplier in the nephron loop was disrupted?

Accepted Answer

The medullary osmotic gradient would decrease, reducing water reabsorption in the collecting duct.

Question 18

Which of the following best describes the effect of aldosterone on the nephron?

Accepted Answer

It increases sodium reabsorption and potassium secretion in the distal convoluted tubule.

Question 19

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

Accepted Answer

Increased urine volume and decreased urine concentration

The Urinary System: Tubular Reabsorption, Secretion, and Water Conservation

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드