Q: A patient presents with high blood pressure and low sodium levels in their urine. Which hormone is most likely elevated, and what is its effect on the nephron?

Aldosterone; it increases Na\textsuperscript{+} reabsorption in the distal convoluted tubule.

Q: A person is experiencing metabolic acidosis. Which of the following renal responses would help compensate for this condition?

Increased secretion of H\textsuperscript{+} and increased reabsorption of HCO$$_3^- in $$the proximal and distal convoluted tubules.

Question 1

Which of the following best describes the main function of the loop of Henle in the nephron?

Accepted Answer

It acts as a countercurrent multiplier system to establish a concentration gradient in the medulla, facilitating water reabsorption.

Question 2

A patient presents with high blood pressure and low sodium levels in their urine. Which hormone is most likely elevated, and what is its effect on the nephron?

Accepted Answer

Aldosterone; it increases Na	extsuperscript{+} reabsorption in the distal convoluted tubule.

Question 3

Which of the following sequences correctly traces the path of blood flow through the kidney?

Accepted Answer

Renal artery $$\rightarrow$$ interlobar artery $$\rightarrow$$ arcuate artery $$\rightarrow$$ interlobular artery $$\rightarrow$$ afferent arteriole $$\rightarrow$$ glomerular capillaries $$\rightarrow$$ efferent arteriole $$\rightarrow$$ peritubular capillaries

Question 4

Which of the following is TRUE regarding the permeability of the loop of Henle?

Accepted Answer

The descending limb is permeable to water but relatively impermeable to solutes, while the ascending limb is impermeable to water but permeable to solutes.

Question 5

A patient with diabetes mellitus has glucose present in their urine. Which concept explains why glucose appears in the urine?

Accepted Answer

The tubular maximum (Tm) for glucose reabsorption is exceeded, so not all glucose can be reabsorbed.

Question 6

Which of the following best describes the role of the juxtaglomerular apparatus in regulating blood pressure?

Accepted Answer

It senses decreased blood pressure in the afferent arteriole and releases renin, initiating the renin-angiotensin-aldosterone system.

Question 7

Which of the following is NOT a function of the kidneys?

Accepted Answer

Production of bile pigments for fat digestion.

Question 8

A person is experiencing metabolic acidosis. Which of the following renal responses would help compensate for this condition?

Accepted Answer

Increased secretion of H	extsuperscript{+} and increased reabsorption of HCO$$_3^- in $$the proximal and distal convoluted tubules.

Question 9

Which of the following best explains why the collecting duct can produce hypertonic urine?

Accepted Answer

It is permeable to water only in the presence of antidiuretic hormone (ADH), allowing water to be reabsorbed as the duct passes through the hyperosmotic medulla.

Question 10

Which of the following is a correct statement about the micturition reflex?

Accepted Answer

It is initiated by stretch receptors in the bladder wall, leading to relaxation of the internal sphincter and contraction of the bladder.

Question 11

Which of the following best describes the difference between cortical and juxtamedullary nephrons?

Accepted Answer

Juxtamedullary nephrons have long loops of Henle and vasa recta, allowing them to concentrate urine more effectively.

Question 12

Which of the following is the correct order of structures that urine passes through from the nephron to the external environment?

Accepted Answer

Collecting duct $$\rightarrow$$ renal pelvis $$\rightarrow$$ ureter $$\rightarrow$$ urinary bladder $$\rightarrow$$ urethra

Question 13

Which of the following best explains why water is reabsorbed in the nephron?

Accepted Answer

Water moves down its osmotic gradient created by the active transport of Na	extsuperscript{+} and Cl	extsuperscript{–}.

Question 14

A patient with chronic vomiting is likely to develop which acid-base disturbance, and how will the kidneys respond?

Accepted Answer

Metabolic alkalosis; the kidneys will increase HCO$$_3^-$$ excretion and decrease H	extsuperscript{+} secretion.

Question 15

Which of the following is a function of the macula densa cells in the juxtaglomerular apparatus?

Accepted Answer

They sense Na	extsuperscript{+} concentration in the distal convoluted tubule and help regulate glomerular filtration rate.

Question 16

Which of the following best describes the effect of atrial natriuretic factor (ANF) on the kidneys?

Accepted Answer

It inhibits Na	extsuperscript{+} reabsorption, leading to increased sodium and water excretion.

Question 17

Which of the following is a correct statement about acid-base balance in the kidneys?

Accepted Answer

The kidneys secrete H	extsuperscript{+} and reabsorb HCO$$_3^- to $$help maintain blood pH.

Question 18

Which of the following is TRUE regarding the external urethral sphincter?

Accepted Answer

It is composed of skeletal muscle and is under voluntary control.

Question 19

Which of the following best explains why the vasa recta are important in the kidney?

Accepted Answer

They act as a countercurrent exchange system, preserving the medullary concentration gradient without causing edema.

The Urinary System and Renal Physiology: Structure, Function, and Regulation

Study Guide - Practice Questions

Study Guide - Flashcards