10 Questions
What is the scientific name for an air sac in the lungs?
Alveolus (singular of alveoli)
Why do we need to breathe out carbon dioxide?
Respiration produces carbon dioxide, which needs to be removed from the body.
According to the pie charts, what is the percentage of nitrogen in inhaled and exhaled air?
78% in both inhaled and exhaled air.
How does the breathing rate change during exercise?
The breathing rate and volume (depth) of breathing increase during exercise to take in more oxygen needed for increased respiration in muscle cells.
What happens when you breathe onto a cold mirror, and why?
The mirror steams up because the water vapor in the exhaled air condenses on the cold surface.
What happens to air when it reaches the alveolus?
Oxygen diffuses into the blood.
What is the main function of the respiratory system?
The main function of the respiratory system is gas exchange.
What structure protects the delicate lungs?
The ribs protect the lungs.
Why do your lungs expand when you breathe in?
Lungs expand to allow you to take in lots of oxygen.
What is the difference in size between the left and right lung?
The left lung is normally smaller than the right lung.
Test your knowledge on the process of respiration and the components of the respiratory system. Learn about gas exchange, lungs, trachea, bronchus, bronchiole, alveolus, inhaling, exhaling, and the importance of breathing.
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