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What is the primary function of breathing?

• To circulate blood throughout the body

• To inhale oxygen and exhale carbon dioxide

• To digest food and absorb nutrients

• To filter waste products from the blood

What is the main role of the mucus and fine hairs in the nose during respiration?

• To produce vocal sounds

• To filter air and regulate its temperature and humidity

• To absorb oxygen directly into the bloodstream

• To detect different smells

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Which sequence correctly represents the path of air through the main respiratory organs after entering the nose?

• Larynx → Trachea → Bronchus → Alveolus

• Trachea → Larynx → Bronchus → Alveolus

• Bronchus → Trachea → Larynx → Alveolus

• Alveolus → Bronchus → Trachea → Larynx

During the inhalation phase of chest breathing, what action do the intercostal muscles perform?

• They relax, causing the ribs to move downwards.

• They contract, causing the ribs to move upwards.

• They flatten the diaphragm, increasing chest cavity volume.

• They cause the diaphragm to arch upwards, decreasing chest cavity volume.