Q: Which equation correctly represents the calculation for alveolar ventilation ($$V_A) $$per minute?

$$V_A = \text{respiratory rate} \times (\text{tidal volume} - \text{anatomic dead space})$$

Q: Which of the following is the correct formula for calculating vital capacity ($$VC$$)?

$$VC = \text{Expiratory Reserve Volume} + \text{Tidal Volume} + \text{Inspiratory Reserve Volume}$$

Question 1

Which of the following best describes the primary function of the respiratory mucosa in the conducting portion of the respiratory tract?

Accepted Answer

To filter, warm, and humidify incoming air while trapping pathogens and debris

Question 2

A patient presents with severe shortness of breath after a chest injury. Imaging reveals air in the pleural cavity and a collapsed lung. Which condition best explains these findings?

Accepted Answer

Pneumothorax

Question 3

During quiet breathing, which muscles are primarily responsible for inhalation, and what percentage of normal air movement do they contribute?

Accepted Answer

Diaphragm (75%) and external intercostals (25%)

Question 4

Which equation correctly represents the calculation for alveolar ventilation ($$V_A) $$per minute?

Accepted Answer

$$V_A = 	ext{respiratory rate} 	imes (	ext{tidal volume} - 	ext{anatomic dead space})$$

Question 5

A person is exposed to carbon monoxide (CO) from a faulty heater. Why is CO poisoning so dangerous in terms of hemoglobin function?

Accepted Answer

CO binds to hemoglobin more strongly than oxygen, preventing oxygen transport

Question 6

According to Boyle’s law, what happens to the pressure of a gas if the volume of its container is doubled, assuming temperature is constant?

Accepted Answer

The pressure is halved

Question 7

Which of the following best explains why a person with pneumonia may experience impaired gas exchange?

Accepted Answer

Fluid leaks into alveoli, increasing diffusion distance across the blood air barrier

Question 8

A patient with chronic obstructive pulmonary disease (COPD) has decreased lung compliance. Which of the following best describes the physiological consequence?

Accepted Answer

Greater force is required to fill the lungs during inhalation

Question 9

Which of the following correctly matches the respiratory epithelium with its location?

Accepted Answer

Stratified squamous epithelium – inferior portions of pharynx

Question 10

Which of the following statements about the oxygen–hemoglobin saturation curve is correct?

Accepted Answer

A rightward shift indicates more oxygen is released at a given partial pressure

Question 11

A climber at high altitude experiences hypoxia. Which of the following best explains this condition?

Accepted Answer

Low atmospheric oxygen partial pressure reduces oxygen diffusion into blood

Question 12

Which of the following is the correct formula for calculating vital capacity ($$VC$$)?

Accepted Answer

$$VC = 	ext{Expiratory Reserve Volume} + 	ext{Tidal Volume} + 	ext{Inspiratory Reserve Volume}$$

Question 13

Which of the following best describes the Bohr effect?

Accepted Answer

A decrease in pH causes hemoglobin to release more oxygen

Question 14

Which of the following is a direct result of sympathetic activation on the bronchioles?

Accepted Answer

Bronchodilation, which decreases airway resistance

Question 15

A patient is hyperventilating due to anxiety. What is the likely effect on arterial carbon dioxide levels and respiratory rate?

Accepted Answer

Arterial $$CO_2$$ decreases (hypocapnia), leading to decreased respiratory rate

Question 16

Which of the following best explains why fetal hemoglobin is able to extract oxygen from maternal blood more efficiently than adult hemoglobin?

Accepted Answer

Fetal hemoglobin has a higher affinity for oxygen at the same partial pressure

Question 17

Which of the following is the main mechanism by which most carbon dioxide is transported in the blood?

Accepted Answer

As bicarbonate ions in plasma

Question 18

Which of the following reflexes prevents overexpansion of the lungs during forced breathing?

Accepted Answer

Inflation reflex (Hering–Breuer reflex)

Question 19

A person inhales deeply and then forcibly exhales as much air as possible. Which pulmonary volume is being measured during the forced exhalation?

Accepted Answer

Expiratory reserve volume (ERV)

Question 20

Which of the following best describes the role of surfactant in the alveoli?

Accepted Answer

It reduces surface tension, preventing alveolar collapse

Comprehensive Study Notes: The Respiratory System (Chapter 23, Anatomy & Physiology)

Study Guide - Practice Questions

Study Guide - Flashcards