Question 1

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

Accepted Answer

To supply the body with oxygen and remove carbon dioxide

Question 2

Which structure is the only external part of the respiratory system and is responsible for filtering, warming, and humidifying air?

Accepted Answer

Nose and nasal cavity

Question 3

What is the main function of the epiglottis during swallowing?

Accepted Answer

To cover the laryngeal inlet and prevent food from entering the airway

Question 4

Which cell type in the alveoli is responsible for producing surfactant to reduce surface tension?

Accepted Answer

Type II alveolar cells

Question 5

A patient has difficulty speaking after damage to the vocal ligaments. Which structure is most likely affected?

Accepted Answer

Larynx (voice box)

Question 6

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

Accepted Answer

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

Question 7

During inspiration, which muscles contract to increase thoracic volume?

Accepted Answer

Diaphragm and external intercostal muscles

Question 8

Which pressure relationship is essential for keeping the lungs inflated and preventing collapse?

Accepted Answer

Transpulmonary pressure ($$P_{tp} = P_{pul} - P_{ip})$$

Question 9

A patient with reduced surfactant production is likely to experience which of the following?

Accepted Answer

Increased alveolar surface tension and risk of alveolar collapse

Question 10

Which respiratory volume is defined as the amount of air inhaled or exhaled during normal breathing?

Accepted Answer

Tidal Volume (TV)

Question 11

A patient has a total lung capacity (TLC) of 6,000 mL, a tidal volume (TV) of 500 mL, an inspiratory reserve volume (IRV) of 3,000 mL, and an expiratory reserve volume (ERV) of 1,000 mL. What is the residual volume (RV)? Use the formula $$TLC = TV + IRV + ERV + RV.$$

Accepted Answer

1,500 mL

Question 12

According to Dalton's Law, what is the total pressure exerted by a mixture of gases?

Accepted Answer

The sum of the partial pressures of each individual gas

Question 13

Which law explains why the amount of oxygen dissolved in plasma is proportional to its partial pressure?

Accepted Answer

Henry's Law

Question 14

During external respiration, which factor most directly increases the rate of gas exchange across the respiratory membrane?

Accepted Answer

Increasing the surface area of the respiratory membrane

Question 15

Which of the following mechanisms is responsible for most carbon dioxide transport in the blood?

Accepted Answer

As bicarbonate ions ($$HCO_3$$^-$$) in plasma

Question 16

The Bohr effect describes how increased $$CO_2 or $$decreased pH affects hemoglobin's affinity for oxygen. What is the result?

Accepted Answer

Decreased affinity, promoting oxygen unloading

Question 17

Which respiratory center in the medulla is primarily responsible for setting the basic rhythm of breathing?

Accepted Answer

Ventral Respiratory Group (VRG)

Question 18

A drop in blood pH due to lactic acid accumulation during intense exercise stimulates which response?

Accepted Answer

Increased respiratory rate

Question 19

Which of the following best explains why matching ventilation and perfusion in the lungs is important?

Accepted Answer

It ensures efficient gas exchange between alveoli and capillaries

Question 20

A patient with chronic obstructive pulmonary disease (COPD) has increased anatomical dead space. What is the physiological consequence?

Accepted Answer

Reduced efficiency of gas exchange

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

Study Guide - Practice Questions

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