Question 1

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

Accepted Answer

To provide the body with oxygen and remove carbon dioxide waste

Question 2

Which structure is the main site of gas exchange in the respiratory system?

Accepted Answer

Alveoli

Question 3

A patient is experiencing difficulty with sound production due to damage in the larynx. Which cartilage is most directly involved in sound production?

Accepted Answer

Arytenoid cartilage

Question 4

During inspiration, which muscles contract to increase the volume of the thoracic cavity?

Accepted Answer

Diaphragm and external intercostals

Question 5

According to Boyle’s Law, what happens to the pressure of a gas if the volume of its container increases, assuming temperature and number of molecules remain constant?

Accepted Answer

Pressure decreases

Question 6

Which of the following equations correctly represents the calculation for alveolar ventilation rate ($$V_A$$)?

Accepted Answer

$$V_A = f 	imes (V_T - V_D)$$

Question 7

A premature infant is diagnosed with respiratory distress syndrome (RDS). What is the primary physiological cause of this condition?

Accepted Answer

Insufficient production of surfactant by Type II alveolar cells

Question 8

Which of the following best explains why the right primary bronchus is more likely to receive an aspirated foreign object than the left?

Accepted Answer

It is wider, shorter, and more vertical than the left bronchus

Question 9

Which of the following is NOT a function of the respiratory system?

Accepted Answer

Synthesis of digestive enzymes

Question 10

A patient presents with hypoventilation. What is the expected effect on blood pH and $$PCO_2$$?

Accepted Answer

Blood pH decreases and $$PCO_2$$ increases

Question 11

Which law explains why oxygen dissolves in blood plasma in proportion to its partial pressure and solubility?

Accepted Answer

Henry’s Law

Question 12

Which of the following is the correct sequence of airflow from the external nares to the alveoli?

Accepted Answer

Nasal cavity → pharynx → larynx → trachea → primary bronchi → secondary bronchi → tertiary bronchi → bronchioles → alveoli

Question 13

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

Accepted Answer

It reduces surface tension, preventing alveolar collapse

Question 14

A patient with pneumonia has thickened respiratory membranes. What is the most likely effect on gas exchange?

Accepted Answer

Decreased efficiency of gas exchange

Question 15

Which of the following is the main factor that determines the direction of gas movement during pulmonary gas exchange?

Accepted Answer

Partial pressure gradients

Question 16

Which equation represents the reversible reaction catalyzed by carbonic anhydrase in erythrocytes?

Accepted Answer

$$CO_2 + H_2O$$ \leftrightarrow H_2CO_3 \leftrightarrow $$HCO_3^- + H$$^+$$

Question 17

Which of the following best describes the role of central chemoreceptors in the regulation of ventilation?

Accepted Answer

They detect changes in $$CO_2$$ and $$H^+ in $$cerebrospinal fluid and adjust ventilation accordingly

Question 18

A climber gradually ascends to high altitude over several days. Which physiological adaptation allows her to maintain adequate blood oxygen levels?

Accepted Answer

Increased sensitivity of peripheral chemoreceptors to low $$PO_2$$

Question 19

Which of the following is a consequence of increased intrapleural pressure to atmospheric or above?

Accepted Answer

Lung collapse

Question 20

Which of the following is the most powerful stimulus for changes in ventilation under normal conditions?

Accepted Answer

Arterial $$PCO_2$$

The Respiratory System: Structure and Function

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