Human Respiratory and Cardiovascular Systems

What is the main function of the respiratory system?

• Digest food

• Filter blood

• Exchange gases

• Regulate temperature

Which structure is the site of gas exchange in the lungs?

• Bronchi

• Trachea

• Bronchioles

• Alveoli

The upper respiratory tract includes all of the following EXCEPT:

• Trachea

• Nasal cavity

• Pharynx

• Larynx

What prevents food from entering the trachea during swallowing?

• Uvula

• Epiglottis

• Vocal cords

• Larynx

Which muscle is primarily responsible for inspiration?

• Alveoli

• Diaphragm

• Visceral pleura

• Trachea

What is the function of surfactant in the alveoli?

• Transport CO₂

• Reduce surface tension

• Increase friction

• Absorb oxygen

The pleural membrane consists of:

• One layer

• Two layers

• Three layers

• No layers

The diaphragm contracts and moves ______ during inhalation.

• Upward

• Downward

• Laterally

• Inward

Hemoglobin binds to oxygen in the:

• Capillaries

• Bronchioles

• Alveoli

• Pulmonary veins

Which structure acts as a passageway for both air and food?

• Trachea

• Larynx

• Pharynx

• Nasal cavity