Читать книгу How to live: A manual of hygiene for use in the schools of the Philippine islands онлайн
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The bones are covered with muscles, which are what we mean when we say the flesh. There are a great many muscles in the body. They give it shape and move it about. When we bend an arm or a finger, we do it by the action of the muscles. The brain tells the muscles how to act, as we have seen. It sends messages along the nerves, and the muscles obey. We can make our muscles strong by exercise, but if we do not use them enough, they will grow weak and soft.
QUESTIONS.
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How does the brain send messages to the different parts of the body?
What does the heart do?
What does the blood take up from the body?
How does it get rid of impurities?
What becomes of food after it is swallowed?
How are the bones of a child different from those of a grown person?
How does it hurt the bones to sit or stand badly?
Why should we sit up straight?
How ought babies to be carried?
Why is it hurtful to carry them on the hip?
What do we call the muscles?
What are their uses?
How can we make our muscles strong?