"
Of what use are the lungs?--"They are the breathing machines of the body."
How do the lungs appear when healthy?--"Porous and spongy."
How does the air get into the lungs?--"The air flows through the nose and
mouth, into the windpipe and along the air-tubes, into the air-cells of the
lungs."
What does the air do in the lungs?--"It swells the lungs and causes the
chest to expand."
What do you mean by expand?--"To increase in size."
How is the air expelled from the lungs?--"The chest contracts and sends
the impure air through the tubes and windpipe, the nose and mouth, into the
atmosphere."
What do you mean by contracts?--"Becomes smaller."
What do you mean by atmosphere?--"The air."
Of what use is the air when it is in the lungs?--"It makes the blood pure."
Why can you not live without breathing?--"Because, if I do not breathe,
pure air cannot get into the lungs to make the bad blood pure, and I cannot
live if the dark, impure blood is sent back again through my body."
Why must you live in the sunlight?--"Because the sunlight helps to purify
the blood and strengthen the body."
Why must you wear loose clothing?--"Because tight clothing stops the
circulation of the blood.
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