I must exercise in work and play to make them strong; I must sleep, or
change my kind of work or play, to give them rest, when they are tired; I
must breathe pure air, take wholesome food and drink, and live in the
sunlight, to supply them with good blood; I must not weaken them by using
alcohol or tobacco.
* * * * *
QUESTIONS FOR THE FORMULA.
1. Tell about the muscles.
2. How many muscles have you in your body?
3. Of what use are the muscles?
4. How may the muscles be named?
5. Tell about the muscles of the head, trunk, and limbs.
6. Which muscles are the weakest, and which are the strongest?
7. What is necessary if you would have strong and healthy muscles?
* * * * *
CLASSES AND WORK OF THE MUSCLES.
The muscles are divided into two great classes: those which we may move as
we choose, called _voluntary_ muscles, and those over which we have no
power, called _involuntary_ muscles.
Some muscles support and move the various parts of the body, others have
different work to do. The heart, the great involuntary muscle, acts like an
engine to drive the blood throughout the body; the lungs draw in and throw
out the air in breathing; the stomach helps to churn and change food into
blood; the tongue is used in speaking and eating.
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