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Respiratory System Lecture Quiz

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Questions and Answers

What is the main function of respiration?

To take in O2 from the atmosphere and carry it to the cells for energy production (correct)
To remove O2 from the cells and carry it to the atmosphere
To take in CO2 from the atmosphere
To carry O2 to the atmosphere

What is the main function of pulmonary ventilation?

Inflow of O2 from the atmosphere to alveoli (correct)
Outflow of CO2 from alveoli to the atmosphere
Outflow of O2 from alveoli to the atmosphere
Inflow of CO2 from the atmosphere to alveoli

Where does the exchange of gases occur in the respiratory system?

Between the air in the alveoli and blood in pulmonary capillaries (correct)
Between the air in the bronchi and blood in pulmonary arteries
Between the air in the trachea and blood in pulmonary veins
Between the air in the atmosphere and blood in systemic capillaries

What is the mechanism of inspiration?

Contraction of the diaphragm & external intercostal muscles increases the volume of thoracic cavity (D) Signup and view all the answers

What is included in the respiratory cycle?

Active inspiration and active expiration (B) Signup and view all the answers

What is the main function of pulmonary perfusion?

To reach the lungs to take in O2 and get rid of CO2 (B) Signup and view all the answers

What is the function of lung surfactant?

Preventing rapid expiration and collapse of the alveoli (B) Signup and view all the answers

What are chemoreceptors responsible for in chemical regulation of respiration?

Increasing CO2 tension in arterial blood (D) Signup and view all the answers

What does surfactant do to the fluid lining the alveoli?

Decreases surface tension (A) Signup and view all the answers

What is the function of dead space in the respiratory system?

Conduction of air (C) Signup and view all the answers

What happens during exhalation?

Lungs get compressed (B) Signup and view all the answers