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The Digestive System: How It Works - Online Term Paper

The Digestive System: How It Works

The digestive systems works on nutrients taken from the environment, breaking them down into simpler products, and then absorbing the products together with water and salts so they can be used in metabolism.
The individuals of all species contain many different protiens or carbohydrates in the cell walls of bacteria, chitin in the external skeletons of arthropods, and so on and foreign proteins or carbohydrates are rarely incorporated unchanged. They are usually first broken down to their constituents before being built up again as the proteins or carbohydrates belonging to the organism.
In such organisms that are not cellular as amoebae, digestion occurs inside the cell. Intracelular ...

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digestion in organisms such as Hydra has evolved from such protozoans as amoebae and paramecia.
In most higher animals digestion is completed not in the cell in the cavity of a digestive tract (the stomach and intestine). Animals with this type of digestion include crustaceans, insects, cephalopods, tunicates, and all vertebrates. A few animals with digestive tracts also partially digest their food before eating it. Some spiders, for example, pierce their prey with fangs that pump digestive fluids into the victim. This liquefies the softer parts, which the spider then sucks into its stomach and intestine, where digestion is completed.

DIGESTIVE ENZYMES

In digestion large molecules are split into smaller ones by enzyme hydrolosis, so named because water is taken up in the process. The enzymes that hydrolyze proteins, fats, and carbohydrates are called, respectively, proteases, lipases, and carbohydrases, or amylases.

Some insects, birds, and herbivorous animals can digest ...

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The Digestive System: How It Works. (2005, March 10). Retrieved November 23, 2024, from http://www.essayworld.com/essays/The-Digestive-System-How-It-Works/23490

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PAPER DETAILS

Added: 3/10/2005 07:41:32 AM
Category: Health & Medicine
Type: Premium Paper
Words: 1022
Pages: 4

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