How Our Lungs Work

The video explains the process of breathing, detailing how the respiratory system works. It covers the journey of air from inhalation through the trachea and bronchial tubes to the alveoli, where gas exchange occurs. Oxygen is absorbed into the blood and transported by the heart to the body, while carbon dioxide is expelled. The diaphragm aids in breathing by creating a vacuum for air intake. Cilia and mucus protect the air passages from harmful substances.

What is the primary function of the bronchial tubes in the respiratory system?

• To filter dust and bacteria from the air

• To divide air into smaller passages

• To pump oxygen into the bloodstream

• To produce mucus for moisture

Where does the exchange of oxygen and carbon dioxide primarily occur in the lungs?

• In the alveoli

• In the diaphragm

• In the trachea

• In the bronchial tubes

How does the diaphragm assist in the breathing process?

• By contracting and relaxing to change lung volume

• By absorbing oxygen

• By filtering air

• By producing mucus

What role do cilia play in the respiratory system?

• They produce carbon dioxide

• They move in a sweeping motion to keep air passages clean

• They absorb oxygen into the blood

• They contract to help with inhalation

What is the function of mucus in the air passages?

• To increase the speed of air flow

• To absorb oxygen

• To dry out the air passages

• To prevent harmful substances from entering the lungs