Question

1. which organ in the respiratory system serves as the primary site of gas exchange?

trachea
bronchi
lungs
nose

Explanation:

To determine the primary site of gas exchange in the respiratory system, we analyze each option:

• Trachea: Transports air to the lungs, not for gas exchange.
• Bronchi: Branch from the trachea to direct air into lung lobes, not the primary exchange site.
• Lungs: Contain alveoli where oxygen and carbon dioxide are exchanged between blood and air.
• Nose: Involved in air intake, filtration, and warming, not gas exchange.

Answer:

Lungs (the option with "Lungs" as the text, corresponding to the third radio button option)