The Digestive System
- Date Submitted: 10/07/2010 06:35 PM
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The human digestive system can be described as a tube divided into several specialized
sections. As humans, we are consumers and need energy. To keep the cells in our body
alive we eat food which supplies us energy. When we digest food, our digestive system
breaks down food into small molecules so they can then move into the blood stream.
Major organs in the digestive system are the mouth, esophagus, stomach, small
intestine, large intestine, rectum, and anus. Food passes through all of these organs. The
other organs in the digestive system such as the liver, pancreas, and gallbladder produce
and store enzymes and chemicals that help break down food as it passes through the
digestive system.
Enzymes are involved with the digestion of carbohydrates, proteins, and fats. We have
enzymes in our mouth which are called salivary amylase. These enzymes are secreted in
the mouth and begin by breaking down the complex proteins. The enzymes in the
stomach contain pepsin which causes complex proteins to break down into less complex
proteins. The pancreas secrets enzymes through a tube into the small intestine. The
resultant sugars are then turned into glucose and used by the body’s cells. The rest of the
enzymes are involved in breaking down fats. Enzymes are very important to your body
because without enzymes you wouldn’t exist. Enzymes are the ones who are responsible
for building your body. They help produce energy in the muscle and nerve cells, and in
the blood-clotting process.
Your digestive system is mechanical and chemical. Mechanical digestion occurs when
food is chewed and mixed in the mouth, and churned in your stomach. Chemical
digestion breaks down large molecules of food into various smaller molecules that are
absorbed by cells.
Mechanical digestion commences in your mouth. The mechanical digestion is when
your tongue and teeth break food up into small...
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