Respiratory Physiology Quiz

Questions and Answers

Which of the following descriptions accurately describes Boyle's Law?

The pressure of gas is directly proportional to the volume.

The pressure of gas in your lungs is inversely proportional to the volume in your lungs. (correct)

The pressure of gas decreases as temperature increases.

The volume of gas is constant regardless of pressure changes.

Which muscles, when contracted, would increase the volume of air in the thoracic cavity?

diaphragm and external intercostals

Which pressure is the result of the natural tendency of the lungs to decrease their size due to elasticity?

intrapleural pressure

During an allergic reaction, which of the following would aid respiration?

epinephrine Signup and view all the answers

If the transpulmonary pressure equals zero, what will happen to the lung?

lungs will collapse Signup and view all the answers

The minute ventilation is _______.

calculated by multiplying the rate of respiration times TV Signup and view all the answers

Under normal conditions, the forced expiratory volume is normally _______.

75 - 85% of the vital capacity Signup and view all the answers

When the radius of the airway was decreased, _______.

expiratory reserve volume decreased Signup and view all the answers

During forced exhalation, _______.

the internal intercostals contract Signup and view all the answers

One hemoglobin can bind a maximum of ___ oxygen(s).

4 Signup and view all the answers

According to the graph, hemoglobin is 25% saturated at PO2 of:

15 mm Hg Signup and view all the answers

As hemoglobin saturation decreases:

more oxygen is released from hemoglobin Signup and view all the answers

_ has a greater partial pressure in the pulmonary capillaries than in the alveoli, so it diffuses into the _.

CO2; alveoli Signup and view all the answers

Why is there as much CO2 exchanged between the alveoli and blood as there is O2?

CO2 is much more soluble in blood than O2 Signup and view all the answers

How would the partial pressures of O2 and CO2 change in an exercising muscle?

The partial pressure of O2 would decrease, and the partial pressure of CO2 would increase Signup and view all the answers

Which way would O2 and CO2 diffuse during internal respiration?

O2 would diffuse into the cells, and CO2 would diffuse into the systemic capillaries Signup and view all the answers

Which of the following is NOT an important factor in gas exchange?

The molecular weight of the gas Signup and view all the answers

Which statement is correct regarding external respiration?

During external respiration, equilibrium is reached for O2 when the partial pressure for O2 in the pulmonary capillaries and the alveoli are the same Signup and view all the answers

Which of the following is another example of a COPD?

Chronic bronchitis Signup and view all the answers

Study Notes

Boyle's Law

Boyle's law states that the pressure of gas is inversely proportional to its volume, relevant in lung function.

Muscle Function in Breathing

The diaphragm and external intercostals muscles contract to increase the volume of air in the thoracic cavity.

Intrapleural Pressure

Intrapleural pressure results from the lungs' elastic tendency to retract and the thoracic wall's effort to expand the lungs.

Allergic Reaction and Respiration

Epinephrine aids respiration during allergic reactions by relaxing airway muscles.

Lung Collapse Mechanism

A transpulmonary pressure of zero causes lung collapse.

Minute Ventilation

Minute ventilation is the product of the respiratory rate and tidal volume (TV).

Forced Expiratory Volume

Under normal conditions, forced expiratory volume is typically 75-85% of vital capacity.

Airway Radius and Expiratory Reserve Volume

Decreased airway radius leads to a decrease in expiratory reserve volume.

Forced Exhalation

During forced exhalation, the internal intercostal muscles contract.

Hemoglobin and Oxygen Binding

Each hemoglobin molecule can bind a maximum of four oxygen molecules.

Hemoglobin Saturation

Hemoglobin is 25% saturated at a partial pressure of oxygen (PO2) of 15 mm Hg.

Oxygen Release from Hemoglobin

Decreased hemoglobin saturation results in more oxygen being released from hemoglobin.

CO2 Diffusion in the Lungs

CO2 has a greater partial pressure in pulmonary capillaries than in alveoli, leading to its diffusion into the alveoli.

Solubility of CO2 vs. O2

CO2 exchanges between alveoli and blood at similar rates as O2, due to its higher solubility in blood.

Partial Pressures during Exercise

In exercising muscle, the partial pressure of O2 decreases while the partial pressure of CO2 increases.

Gas Diffusion in Internal Respiration

During internal respiration, O2 diffuses into cells, and CO2 diffuses into systemic capillaries.

Factors Affecting Gas Exchange

The molecular weight of the gas is NOT an important factor in gas exchange during internal and external respiration.

Equilibrium in External Respiration

Equilibrium of O2 in external respiration occurs when the partial pressures in pulmonary capillaries and alveoli equalize.

COPD Disorders

Chronic bronchitis is an example of a chronic obstructive pulmonary disease (COPD).

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Description

Test your knowledge on key concepts of respiratory physiology, including Boyle's Law, muscle function in breathing, and lung mechanics. This quiz covers essential topics such as intrapleural pressure, minute ventilation, and the impact of allergic reactions on respiration. Perfect for students studying human anatomy and physiology.