$$ GFR = K_f \times (P_{GC} - P_{BS} - \pi_{GC}) $$

Question 1

Which of the following is NOT one of the three main functions of the kidney?

Accepted Answer

Regulation of blood glucose levels

Question 2

A patient presents with severe dehydration. Which fluid compartment will lose water first?

Accepted Answer

Extracellular fluid (ECF)

Question 3

Which structure is responsible for the majority of water reabsorption in the nephron?

Accepted Answer

Proximal convoluted tubule

Question 4

A person with hypotonic hydration is most likely to experience which of the following?

Accepted Answer

Cellular swelling due to water moving into cells

Question 5

Which equation best represents the osmotic gradient established in the kidney's medulla?

Accepted Answer

$$ \Delta C = C_{inner} - C_{outer} $$

Question 6

Which of the following is a correct sequence for blood flow through the kidney?

Accepted Answer

Renal artery → segmental artery → interlobar artery → arcuate artery → cortical radiate artery

Question 7

Which of the following is TRUE regarding juxtamedullary nephrons?

Accepted Answer

They play a key role in establishing the osmotic gradient for urine concentration.

Question 8

A patient with edema is most likely experiencing which of the following?

Accepted Answer

Accumulation of fluid in the interstitial space

Question 9

Which of the following is a function of the juxtaglomerular complex (JGC)?

Accepted Answer

Regulation of blood pressure via renin release

Question 10

Which chemical buffer system is most effective in the extracellular fluid?

Accepted Answer

Bicarbonate buffer system

Question 11

A patient with excessive vomiting is at risk for which electrolyte imbalance?

Accepted Answer

Hypokalemia

Question 12

Which formula best describes the calculation of glomerular filtration rate (GFR)?

Accepted Answer

$$ GFR = K_f 	imes (P_{GC} - P_{BS} - \pi_{GC}) $$

Question 13

Which of the following is a major difference between electrolytes and non-electrolytes?

Accepted Answer

Electrolytes dissociate into ions in water, while non-electrolytes do not.

Question 14

Which step in urine production is primarily responsible for removing waste products from the blood?

Accepted Answer

Filtration

Question 15

A patient with diabetes insipidus is unable to concentrate urine. Which part of the nephron is most affected?

Accepted Answer

Collecting duct

Question 16

Which equation best represents water balance in the body?

Accepted Answer

$$ Intake = Output $$

Question 17

Which of the following is a sign of dehydration?

Accepted Answer

Decreased skin turgor

Question 18

Which capillary bed is associated with juxtamedullary nephrons and is crucial for maintaining the medullary osmotic gradient?

Accepted Answer

Vasa recta

Question 19

Which of the following best describes the filtration membrane in the kidney?

Accepted Answer

It consists of fenestrated endothelium, basement membrane, and podocyte filtration slits.

Question 20

A patient with chronic kidney disease has reduced ability to regulate blood pH. Which buffer system will be most affected?

Accepted Answer

Bicarbonate buffer system

Unit 4 Review: The Urinary System and Fluid & Electrolyte Balance

Study Guide - Practice Questions