(To learn more
about proteins, carbohydrates, and fats visit:
Cells are Us)
organs are involved in digestion?
organs are involved in the digestive process (see the diagram on the left). First,
food enters the body via the mouth, where saliva from the salivary
gland begins to break down carbohydrates. Next, the food goes down
the food tube, the esophagus, pushed by muscular contractions.
The food ends up in the stomach, where stomach acids breakdown
much of the protein into amino acids and kill most bacteria in the food.
The liver processes and regulates the substances entering the blood
stream from the food that is ingested. The liver also produces bile,
contains worn-out red blood cells, that
is stored in the gall bladder.
The pancreas assists
in digestion of carbohydrates, proteins, and fats, and it regulates
blood sugar levels by directing cells to take up or to secrete sugar
into the blood. Once leaving the stomach, the food travels into the
small intestine where carbohydrates, amino acids and fats are
absorbed. After entering the large intestine, moisture is absorbed
from what is left of the food and bacteria breaks down some of the material
that has not been digested. This creates waste (feces). The rectum
is the final storage space for wastes, which is what becomes of the
food once all of the nutrients and moisture have been removed. The wastes
remain in the rectum until excreted.
time food stays in the various parts of the digestive tract in a human under normal
conditions is approximately as follows:
this, you should be able to answer the following:
do you get hungry at the times for breakfast, lunch, and dinner?
should you have a bowel movement every day or two?
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