Q: A climber at high altitude experiences a decrease in the partial pressure of oxygen in the alveoli. According to Dalton’s Law, which equation best describes the calculation of partial pressure of a gas in a mixture?

$$P_{gas} = P_{total} \times F_{gas}$$

Question 1

Which of the following best describes the primary function of the respiratory mucosa?

Accepted Answer

To warm, moisten, and filter incoming air, trapping pathogens and debris

Question 2

A patient inhales a peanut, which becomes lodged in the right primary bronchus. Which anatomical feature explains why this is more likely to occur in the right bronchus than the left?

Accepted Answer

The right primary bronchus is shorter, wider, and more vertical than the left

Question 3

Which of the following equations correctly represents Boyle’s Law as it applies to pulmonary ventilation?

Accepted Answer

$$P_1V_1 = P_2V_2$$

Question 4

During forced exhalation, which muscle group is primarily responsible for decreasing thoracic volume?

Accepted Answer

Internal intercostals and abdominal muscles

Question 5

A climber at high altitude experiences a decrease in the partial pressure of oxygen in the alveoli. According to Dalton’s Law, which equation best describes the calculation of partial pressure of a gas in a mixture?

Accepted Answer

$$P_{gas} = P_{total} 	imes F_{gas}$$

Question 6

Which of the following best explains why carbon monoxide (CO) poisoning is so dangerous in terms of hemoglobin binding?

Accepted Answer

CO binds to hemoglobin with a much higher affinity than oxygen, reducing oxygen transport

Question 7

A patient with emphysema has decreased lung compliance. Which equation best defines compliance in the respiratory system?

Accepted Answer

$$C = \Delta V / \Delta P$$

Question 8

Which of the following is NOT a function of the pleura and pleural fluid?

Accepted Answer

Facilitating gas exchange between alveoli and capillaries

Question 9

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

Accepted Answer

External respiration is the exchange of gases between alveoli and blood; internal respiration is the exchange between blood and peripheral tissues

Question 10

A patient is experiencing hypercapnia. Which of the following best describes the body’s typical respiratory response?

Accepted Answer

Increase in respiratory rate to expel excess CO$$_2$$

Question 11

Which of the following equations best represents Henry’s Law as it applies to gas exchange in the lungs?

Accepted Answer

$$C = kP$$

Question 12

Which of the following changes would shift the oxygen-hemoglobin dissociation curve to the right, facilitating oxygen release to tissues?

Accepted Answer

Increased BPG (2,3-bisphosphoglycerate) concentration

Question 13

Which of the following is the correct sequence for the pathway of air from the mouth to the alveoli?

Accepted Answer

Mouth → Pharynx → Larynx → Trachea → Primary bronchi → Bronchioles → Alveoli

Question 14

Which of the following best describes the role of the respiratory centers in the medulla oblongata?

Accepted Answer

They generate the basic rhythm of breathing and control the rate and depth of respiration

Question 15

A person’s tidal volume is 500 mL and their respiratory rate is 12 breaths per minute. What is their minute ventilation?

Accepted Answer

$$500 \ \mathrm{mL} 	imes 12 = 6000 \ \mathrm{mL/min}$$

Question 16

Which of the following statements about the respiratory membrane is correct?

Accepted Answer

It consists of alveolar epithelium, fused basement membranes, and capillary endothelium

Question 17

Which of the following best describes how most carbon dioxide is transported in the blood?

Accepted Answer

As bicarbonate ions ($$HCO_3$$^-$$) formed by the reaction of CO_2$ with water

Question 18

Which of the following is a function of the upper respiratory system?

Accepted Answer

Warming, humidifying, and filtering incoming air

Question 19

A person voluntarily holds their breath. Which brain region is primarily responsible for this voluntary control?

Accepted Answer

Cerebral cortex

Question 20

Which of the following best describes the effect of increased CO$$_2$$ detected by central chemoreceptors?

Accepted Answer

Increased respiratory rate and depth

Step-by-Step Guidance for Respiratory System Study Guide (BI 233)

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