Q: Which equation correctly represents Boyle’s Law as it applies to pulmonary ventilation?

$$P_1$$ \times $$V_1$$ = $$P_2$$ \times $$V_2$$

Q: Calculate the partial pressure of oxygen ($$P_{O_2$}) in $$atmospheric air at sea level (760 mm Hg), given that oxygen makes up 20.9% of air.

$$P_{O_2$} = 0.209 \times 760 = 159 mm Hg$$

Q: Which formula correctly calculates alveolar ventilation rate (AVR)?

$$AVR = frequency \times (TV - dead\ space)$$

Question 1

During quiet inspiration, which muscles are primarily responsible for increasing thoracic volume, and what is the physiological result of this increase?

Accepted Answer

Diaphragm and external intercostals; decrease in intrapulmonary pressure causing air to enter the lungs

Question 2

Which equation correctly represents Boyle’s Law as it applies to pulmonary ventilation?

Accepted Answer

$$P_1$$ 	imes $$V_1$$ = $$P_2$$ 	imes $$V_2$$

Question 3

A patient presents with a pneumothorax. Which pressure relationship is disrupted, and what is the immediate consequence?

Accepted Answer

Transpulmonary pressure becomes zero; the lung collapses

Question 4

Which of the following best explains why surfactant is essential for normal lung function?

Accepted Answer

It decreases alveolar surface tension, making it easier to expand the lungs

Question 5

Calculate the partial pressure of oxygen ($$P_{O_2$}) in $$atmospheric air at sea level (760 mm Hg), given that oxygen makes up 20.9% of air.

Accepted Answer

$$P_{O_2$} = 0.209 	imes 760 = 159 mm Hg$$

Question 6

Which of the following conditions would most likely decrease lung compliance?

Accepted Answer

Fibrosis due to chronic inflammation

Question 7

A premature infant is diagnosed with infant respiratory distress syndrome (IRDS). What is the underlying cause?

Accepted Answer

Insufficient surfactant resulting in increased alveolar surface tension and collapse

Question 8

Which formula correctly calculates alveolar ventilation rate (AVR)?

Accepted Answer

$$AVR = frequency 	imes (TV - dead\ space)$$

Question 9

During external respiration, why does oxygen diffuse from alveoli into pulmonary capillaries?

Accepted Answer

Alveolar $$P_{O_2$} is $$higher than venous blood $$P_{O_2$}$$

Question 10

Which of the following best describes the effect of increased airway resistance on pulmonary ventilation?

Accepted Answer

Gas flow decreases as resistance increases

Question 11

A patient with obstructive pulmonary disease is likely to have which of the following spirometry findings?

Accepted Answer

Increased residual volume (RV) and total lung capacity (TLC)

Question 12

Which equation correctly expresses lung compliance ($$C_L$$)?

Accepted Answer

$$C_L = \Delta V_L / \Delta (P_{pul} - P_{ip})$$

Question 13

Which of the following scenarios would most likely result in a decrease in effective alveolar ventilation rate (AVR)?

Accepted Answer

Rapid, shallow breathing

Question 14

According to Henry’s Law, which gas will dissolve most readily in plasma at a given partial pressure?

Accepted Answer

Carbon dioxide ($$CO_2)$$

Question 15

Which of the following best describes the effect of high alveolar $$P_{CO_2$} on $$bronchiolar diameter?

Accepted Answer

Bronchioles dilate to allow more $$CO_2$$ elimination

Question 16

Which combination of respiratory volumes equals vital capacity (VC)?

Accepted Answer

$$VC = TV + IRV + ERV$$

Question 17

A patient with left heart failure develops pulmonary edema. What is the most likely effect on gas exchange?

Accepted Answer

Increased thickness of the respiratory membrane, impairing gas exchange

Question 18

Which of the following is true regarding ventilation-perfusion coupling in the lungs?

Accepted Answer

High alveolar $$P_{O_2$}$$ causes arterioles to dilate, directing blood to well-ventilated areas

Question 19

Which of the following best explains why patients with emphysema have reduced gas exchange efficiency?

Accepted Answer

Decreased alveolar surface area due to destruction of alveolar walls

Question 20

During internal respiration, what is the direction of oxygen and carbon dioxide movement between blood and tissues?

Accepted Answer

Oxygen moves from blood to tissues; carbon dioxide moves from tissues to blood

Chapter 21 - Respiratory System pt. B

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드