Question

question 4 1 pts which is true of the human respiratory system? gas exchange occurs all along the respiratory system. the nasal passages clean the air traveling to the lungs. white blood cells carry most of the oxygen that is carried in the blood. the mouth is the opening to the respiratory system. none of these are true of the respiratory system

Explanation:

• Gas exchange mainly occurs in the alveoli of the lungs, not all along the respiratory system.
• The nasal passages have cilia and mucus that can trap dust and particles, cleaning the air traveling to the lungs.
• Red blood cells (with hemoglobin) carry most of the oxygen in the blood, not white blood cells.
• The nose (and nasal passages) is the main opening to the respiratory system (though the mouth can also be used for breathing in some cases, but it's not the typical primary opening).

Answer:

The nasal passages clean the air traveling to the lungs.