Respiratory System

What is the primary purpose of oxygen in cellular respiration?

• To warm and humidify the air.

• To produce ATP, an energy currency.

• To filter out dust and contaminants.

• To protect the lungs from damage.

Which of the following is the correct order of structures air passes through during inhalation?

• Nasal cavity -> Larynx -> Pharynx -> Trachea

• Nasal cavity -> Pharynx -> Larynx -> Trachea

• Pharynx -> Nasal cavity -> Larynx -> Trachea

• Larynx -> Trachea -> Pharynx -> Nasal cavity

How many lobes are typically found in the right and left human lungs, respectively?

• Two in the right, three in the left.

• Three in the right, two in the left.

• Two in each lung.

• Three in each lung.

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What happens to blood pH when the concentration of carbon dioxide in the blood increases?

• The blood becomes more alkaline.

• The blood becomes more acidic.

• The blood pH remains neutral.

• The blood pH increases.