Q: Which equation describes the relationship between carbon dioxide and pH in the blood, as catalyzed by carbonic anhydrase?

$$\mathrm{CO}_2 + \mathrm{H}_2\mathrm{O} \xrightarrow{\text{carbonic anhydrase}} \mathrm{H}_2\mathrm{CO}_3 \rightarrow \mathrm{H}^+ + \mathrm{HCO}_3^-$$

Q: Which equation best represents the calculation of glomerular filtration rate (GFR)?

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

Question 1

Which of the following best describes the difference between internal and external respiration?

Accepted Answer

Internal respiration is the exchange of gases between blood and tissues, while external respiration is the exchange of gases between alveoli and blood.

Question 2

As air moves from the upper respiratory tract toward the alveoli, which anatomical change occurs and why is it functionally significant?

Accepted Answer

Epithelium changes from stratified squamous to simple squamous, facilitating efficient gas exchange.

Question 3

Which cell type in the alveoli is primarily responsible for producing pulmonary surfactant, and what is its main function?

Accepted Answer

Type II alveolar cells; they reduce surface tension to prevent alveolar collapse.

Question 4

Pulmonary surfactant decreases surface tension in the alveoli. According to the Law of Laplace, which equation describes the relationship between pressure, surface tension, and radius in the alveolus?

Accepted Answer

$$P = \frac{2T}{r}$$

Question 5

A patient with emphysema has decreased lung compliance. What effect would this have on their breathing mechanics?

Accepted Answer

They would require more effort to inflate their lungs, leading to increased work of breathing.

Question 6

Minute ventilation ($$\dot{V}_E) is $$calculated using which formula?

Accepted Answer

$$\dot{V}_E = V_T 	imes f$$

Question 7

If a person increases their respiratory rate but decreases their tidal volume, what is the likely effect on alveolar ventilation?

Accepted Answer

Alveolar ventilation may decrease because a greater proportion of each breath is dead space.

Question 8

Which of the following best describes the oxyhemoglobin dissociation curve and its physiological significance?

Accepted Answer

It is sigmoidal, indicating cooperative binding and efficient oxygen loading in the lungs and unloading in tissues.

Question 9

A rightward shift in the oxyhemoglobin dissociation curve is caused by which of the following conditions?

Accepted Answer

Increased temperature, increased PCO2, and decreased pH.

Question 10

Which equation describes the relationship between carbon dioxide and pH in the blood, as catalyzed by carbonic anhydrase?

Accepted Answer

$$\mathrm{CO}_2 + \mathrm{H}_2\mathrm{O} \xrightarrow{	ext{carbonic anhydrase}} \mathrm{H}_2\mathrm{CO}_3 ightarrow \mathrm{H}^+ + \mathrm{HCO}_3^-$$

Question 11

Which structure in the nephron is primarily responsible for filtration of blood plasma?

Accepted Answer

Glomerulus

Question 12

Which of the following Starling forces would increase glomerular filtration rate (GFR)?

Accepted Answer

Increased glomerular capillary hydrostatic pressure

Question 13

Which equation best represents the calculation of glomerular filtration rate (GFR)?

Accepted Answer

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

Question 14

Which hormone increases water reabsorption in the collecting duct by increasing aquaporin insertion into the apical membrane?

Accepted Answer

Antidiuretic hormone (ADH)

Question 15

A patient with hypervolemia would most likely have which of the following changes in plasma volume and osmolarity?

Accepted Answer

Increased plasma volume and decreased osmolarity

Question 16

Which mechanism is responsible for generating the medullary osmotic gradient in the kidney?

Accepted Answer

Active reabsorption of sodium and chloride in the ascending limb of the Loop of Henle

Question 17

Which hormone is released in response to increased plasma sodium and acts to decrease sodium reabsorption in the kidney?

Accepted Answer

Atrial natriuretic peptide (ANP)

Question 18

The renin-angiotensin-aldosterone system (RAAS) is activated in response to which physiological condition?

Accepted Answer

Decreased blood pressure and decreased plasma sodium

Question 19

Which of the following best describes the effect of the respiratory system on acid-base balance?

Accepted Answer

By increasing the rate of carbon dioxide expiration, the respiratory system increases blood pH.

Pulmonary Ventilation, Gas Exchange, and Renal Function: Study Guide Notes

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