Q: Given the following values, calculate the net glomerular filtration pressure (GFP): $$\text{Glomerular capillary hydrostatic pressure} = 60\ \text{mmHg}$$ $$\text{Bowman's capsule hydrostatic pressure} = 18\ \text{mmHg}$$ $$\text{Glomerular capillary oncotic pressure} = 32\ \text{mmHg}$$ Which equation should you use, and what is the net GFP?

Use $$\text{GFP} = 60 - (18 + 32) = 10\ \text{mmHg}$$

Question 1

Which of the following best describes the location where glomerular filtration occurs in the nephron?

Accepted Answer

In the glomerulus, where plasma is filtered into Bowman's capsule

Question 2

Given the following values, calculate the net glomerular filtration pressure (GFP):

$$	ext{Glomerular capillary hydrostatic pressure} = 60\ 	ext{mmHg}$$

$$	ext{Bowman's capsule hydrostatic pressure} = 18\ 	ext{mmHg}$$

$$	ext{Glomerular capillary oncotic pressure} = 32\ 	ext{mmHg}$$

Which equation should you use, and what is the net GFP?

Accepted Answer

Use $$	ext{GFP} = 60 - (18 + 32) = 10\ 	ext{mmHg}$$

Question 3

If a patient experiences a significant drop in plasma protein concentration, what is the most likely effect on glomerular filtration rate (GFR), and why?

Accepted Answer

GFR increases because plasma oncotic pressure decreases

Question 4

Which of the following scenarios would most likely cause a decrease in GFR?

Accepted Answer

A decrease in mean arterial pressure (MAP)

Question 5

Which of the following best describes the effect of the baroreceptor reflex on GFR during acute blood loss?

Accepted Answer

It decreases GFR by constricting the afferent arteriole

Question 6

Which segment of the nephron is most permeable to water but not to solutes, and what is the consequence for filtrate osmolarity?

Accepted Answer

The descending limb of the loop of Henle; filtrate becomes more concentrated

Question 7

A patient has a blockage in the urinary tract, causing increased hydrostatic pressure in Bowman's capsule. What is the expected effect on GFR?

Accepted Answer

GFR will decrease due to increased opposing pressure

Question 8

Which hormone increases water permeability in the late distal convoluted tubule (DCT) and collecting ducts, and what is the mechanism?

Accepted Answer

Antidiuretic hormone (ADH); by inserting aquaporins

Question 9

Which of the following best describes the effect of aldosterone on the late DCT and cortical collecting ducts?

Accepted Answer

It increases sodium reabsorption and potassium secretion

Question 10

A patient with uncontrolled diabetes mellitus has glucose in their urine. Which renal process has been exceeded, and why does glucose appear in the urine?

Accepted Answer

The renal threshold for glucose reabsorption has been exceeded; transporters are saturated

Question 11

Which hormone acts to decrease sodium reabsorption in the nephron, and what is the effect on plasma volume?

Accepted Answer

Atrial natriuretic peptide (ANP); plasma volume decreases

Question 12

Which of the following best describes the osmolarity changes in the filtrate as it passes through the nephron loop (loop of Henle)?

Accepted Answer

Filtrate becomes more concentrated in the descending limb and more dilute in the ascending limb

Question 13

Which of the following is a direct effect of the sympathetic nervous system on renal function?

Accepted Answer

Constriction of afferent arterioles, leading to decreased GFR

Question 14

Which hormone is released in response to low plasma calcium levels and acts on the nephron to increase calcium reabsorption?

Accepted Answer

Parathyroid hormone (PTH)

Question 15

Which of the following best explains the negative feedback mechanism that regulates aldosterone release via the renin-angiotensin-aldosterone system (RAAS)?

Accepted Answer

Low plasma volume stimulates renin release, leading to increased angiotensin II and aldosterone, which increases sodium and water reabsorption, restoring plasma volume

Question 16

If a patient has increased plasma potassium levels, which negative feedback mechanism is activated to restore potassium balance?

Accepted Answer

Aldosterone release increases, enhancing potassium secretion in the late DCT and collecting ducts

Question 17

Which of the following best describes the difference in osmolarity between the renal cortex and the renal medulla?

Accepted Answer

The renal cortex is isotonic to plasma, while the renal medulla is hypertonic

Question 18

Which hormone acts on the nephron to increase sodium reabsorption and potassium secretion, and where does it primarily exert its effect?

Accepted Answer

Aldosterone; late distal convoluted tubule and cortical collecting duct

Question 19

Which of the following best describes the effect of angiotensin II (ANG II) on the nephron and systemic circulation?

Accepted Answer

It constricts efferent arterioles, increases sodium reabsorption, and raises blood pressure

Renal Physiology: Glomerular Filtration and Fluid/Electrolyte Homeostasis

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