Q1
Where does air travel after entering our nose?
ADown the trachea
BDirectly to the stomach
CDirectly to the heart
DNowhere
ICSEClass 6 (ICSE)ScienceCh 18 · Topic 1
The Respiratory System
The respiratory system allows us to breathe, taking in oxygen and releasing carbon dioxide through organs like the nose, trachea, and lungs.
Core concept
We breathe in air through our nose or mouth, which travels down the trachea (windpipe) into the lungs.
How it works
Inside the lungs, tiny air sacs called alveoli allow oxygen to pass into the blood and carbon dioxide to pass out.
Why it matters
The diaphragm, a muscle below the lungs, helps us breathe by contracting and relaxing to move air in and out.
Key detail
The respiratory system works closely with the circulatory system to deliver oxygen throughout the body.
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Quick notes
• We breathe in through the nose or mouth.
• Air travels down the trachea into the lungs.
• Alveoli are tiny air sacs in the lungs.
• Oxygen passes into blood at the alveoli.
• Carbon dioxide passes out at the alveoli.
• The diaphragm helps us breathe.
• It contracts and relaxes to move air.
• Respiratory and circulatory systems work together.