~19.~ Also observe that there are five digestive fluids, saliva,
gastric juice, bile, pancreatic juice, and intestinal juice.


SUMMARY.

1. The process of dissolving and changing the food so that it may be
absorbed and may nourish the body is digestion.

2. The work of digestion is chiefly done in the digestive tube or canal,
which is about thirty feet in length.

3. The mouth contains the teeth, and has three pairs of salivary glands
connected with it, which make saliva.

4. The gullet leads from the mouth to the stomach.

5. The stomach is pear-shaped, and holds about three pints.

6. It has an upper and a lower opening, each of which is guarded by a
muscle, which keeps its contents from escaping.

7. The lower opening of the stomach is called the pylorus.

8. The stomach forms the gastric juice.

9. The intestines are about twenty-five feet long. They form the
intestinal juice.