The Digestive system's Purpose.
The digestive system breaks down fats, proteins, and all carbohydrates into smaller molecules so they can be absorbed along with vitamins and minerals. The fats, proteins, etc. can be turned into energy!
THE DIGESTIVE SYSTEM'S Function.
The Digestive System's function is to digest the food you eat and turn it into energy and nutrients for the body to use.
The Levels Of organization
The Organ system is the digestive Tract or system. Then the organs include: The mouth, Pharynx, Epiglottis, Esophagus, Liver, Gallbladder, Stomach, Pancreas, Small Intestine, Large Intestine, Appendix, and the Anus. Most of the tissue in the digestive tract itself has four layers. These layers are called the mucosa, the submucosa, muscularis externa, and the serosa. The cells in the Digestive system would include The endocrine cells of the digestive system: amines, peptides, and modes of action.
Key Organs in the system
Key Organs include: The mouth, Pharynx, Epiglottis, Esophagus, Liver, Gallbladder, Stomach, Pancreas, Small Intestine, Large Intestine, Appendix, and the Anus.
The organs and their general Path
Digestion starts with the mouth, were the food gets broken down by crushing it with the teeth, then saliva, from the salivary glands, chemically breaks it down more. It then passes through the pharynx or throat and goes into the stomach. There it is broken down and dissolved by acids. It then goes into the small intestine, which puts more enzymes in it. The nutrients is absorbed into the bloodstream, and is carried throughout the liver, where it can be used as energy and sorted out from good and waste. Then the food goes through the large intestine and is kept in the rectum until excreted through the anus as waste.
The Organs Themselves
MOUTH
The mouth is the beginning of the digestive tract. Enzymes in the mouth start the process. ESOPHAGUS The esophagus is a soft muscular tube that moves food from the pharynx to the stomach. STOMACH The stomach has a tough lining that holds in all of the acids that further liquify and soften the food. LIVER The liver stores energy and helps get rid of toxics from the body. GALL-BLADDER The gallbladder is a small pouch that stores all the bile. The gallbladder releases the bile so it can break down all the fats you eat. SMALL INTESTINE The small intestine is a long, skinny tube in which digestion and absorption take place. The intestine actually sucks up all of the nutrients, proteins, carbohydrates, and vitamins and minerals. LARGE INTESTINE The large intestine is made up of the cecum, colon, and rectum. The cecum is the beginning and works a bit like a pocket. The colon is like a big tube and is the largest part of the intestine. Then there is the rectum which stores feces until the are excreted. ANUS The anus is the exiting point of the digestive system, where the feces leave the body. |
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http://science.nationalgeographic.com/science/health-and-human-body/human-body/digestive-system-article/
http://kidshealth.org/kid/htbw/digestive_system.html
http://kidshealth.org/kid/htbw/DSmovie.html