Q: Which of the following equations correctly represents the calculation of net filtration pressure (NFP) in the glomerulus?

$$\mathrm{NFP} = \text{Outward pressure} - \text{Inward pressure}$$

Question 1

Which of the following best describes the primary function of the glomerulus in the nephron?

Accepted Answer

It filters blood plasma to form filtrate, initiating urine formation.

Question 2

A patient presents with high blood pressure and low urine output. Which change in glomerular filtration rate (GFR) is most likely responsible, and what is the physiological consequence?

Accepted Answer

Decreased GFR; increased blood volume due to reduced urine formation.

Question 3

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

Accepted Answer

$$\mathrm{NFP} = 	ext{Outward pressure} - 	ext{Inward pressure}$$

Question 4

Which hormone increases sodium reabsorption in the distal convoluted tubule (DCT) and collecting duct, and what is the effect on blood pressure?

Accepted Answer

Aldosterone; increases blood pressure by increasing sodium and water reabsorption.

Question 5

A patient is experiencing dehydration. Which of the following changes would you expect in their urine and ADH levels?

Accepted Answer

Urine volume decreases, ADH levels increase.

Question 6

Which of the following best explains why the filtrate in the nephron loop (loop of Henle) has its highest osmolality at the bend of the loop?

Accepted Answer

Water is reabsorbed in the descending limb, concentrating the filtrate.

Question 7

Which of the following is the major cation in the extracellular fluid (ECF), and what is its primary role?

Accepted Answer

Na$$^+$$; maintaining osmotic pressure and fluid balance.

Question 8

A patient with chronic obstructive pulmonary disease (COPD) has elevated blood CO$$_2$$ levels. Which acid-base disorder are they most at risk for, and why?

Accepted Answer

Respiratory acidosis; CO$$_2$$ accumulation increases H$$^+$$ concentration.

Question 9

Which of the following best describes the effect of atrial natriuretic peptide (ANP) on sodium and water balance?

Accepted Answer

ANP decreases sodium reabsorption, leading to decreased blood volume and pressure.

Question 10

Which of the following is a correct statement about the countercurrent multiplier and exchanger in the kidney?

Accepted Answer

The nephron loop acts as the countercurrent multiplier, while the vasa recta acts as the countercurrent exchanger.

Question 11

A patient has a renal clearance value ($$C) of 0 $$for a particular substance. What does this indicate about the handling of this substance by the kidneys?

Accepted Answer

The substance is completely reabsorbed by the renal tubules.

Question 12

Which of the following best explains the difference between transcellular and paracellular reabsorption in the nephron?

Accepted Answer

Transcellular reabsorption involves movement through the cell, while paracellular reabsorption occurs between cells.

Question 13

Which of the following is a consequence of hyperkalemia?

Accepted Answer

Decreased membrane potential, leading to cardiac arrhythmias.

Question 14

Which of the following best describes the role of the phosphate buffer system in acid-base balance?

Accepted Answer

It helps generate new bicarbonate ions in the kidneys to buffer excess H$$^+.$$

Question 15

A patient with severe vomiting is found to have a blood pH of 7.48. Which acid-base disorder is present, and what is the likely cause?

Accepted Answer

Metabolic alkalosis; loss of gastric acid increases blood pH.

Question 16

Which of the following events occurs first during the process of micturition?

Accepted Answer

Bladder distension activates stretch receptors.

Question 17

Which of the following best explains why infants are more susceptible to dehydration than adults?

Accepted Answer

Infants have a higher percentage of body water and higher metabolic rate.

Question 18

Which of the following best describes the effect of antidiuretic hormone (ADH) on the collecting ducts of the nephron?

Accepted Answer

ADH increases water reabsorption by inserting aquaporins into the collecting duct membrane.

Question 19

A patient with uncontrolled diabetes mellitus develops metabolic acidosis. Which compensatory mechanism would you expect to be activated?

Accepted Answer

Increased respiratory rate to blow off CO$$_2$$ and decrease H$$^+$$ concentration.

Question 20

Which of the following best describes the effect of parathyroid hormone (PTH) on calcium and phosphate balance?

Accepted Answer

PTH increases calcium reabsorption and enhances phosphate secretion in the kidneys.

BIO 169 Exam #5 Study Guide: The Urinary System and Fluid, Electrolyte, & Acid-Base Balance

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