Tuesday, February 14, 2017

THE DIGESTIVE SYSTEM


THE DIGESTIVE SYSTEM















THE BASICS
The digestive system is responsible for digestion and absorption. When you get hungry, you eat. Once you put the food in your mouth, you start to chew and begin a process of mechanical digestion that grinds food down into a pulp. Your body also starts to release enzymes that begin the process of chemical digestion and the breakdown of biological molecules. Most chemical digestion happens in the stomach. The food moves through your digestive system and is eventually broken down into compounds and nutrients that your small intestine can absorb into the blood stream. The material you don't absorb continues into the large intestine where water is removed from the material and then whatever is left can be eliminated.

The digestive system is made up of:
- Salivary glands: produce saliva, which keeps the mouth and other parts of the digestive system moist; it also helps break down carbohydrates and lubricates the passage of food down from the pharynx to the esophagus to the stomach
- Pharynx: its muscular walls function in the process of swallowing and it serves as a pathway for the movement of food from the mouth to the esophagus
- Esophagus: carries food, liquids, and saliva from the mouth to the stomach
- Stomach: a container to start digestion and pump food and liquids into the intestines in a controlled process
- Small intestine: absorbs nutrients and minerals from food; 90% of digestion happens here
- Large intestine: absorb water from the remaining indigestible food matter and transmit the useless waste material from the body
- Rectum: serves as a temporary storage place for feces before they are expelled by the anus; the final
part of the large intestine and a component in the lower gastrointestinal act
- Liver: regulates the composition of blood, including the amounts of sugar, protein, and fat that enter the bloodstream; it removes bilirubin, ammonia, and other toxins from the blood
- Gallbladder: stores and concentrate bile
- Pancreas: releases juices directly into the bloodstream and into the ducts

INTERACTIONS WITH OTHER SYSTEMS
"The digestive system works with the circulatory system to get the absorbed the nutrients distributed
through your body. The circulatory system also carries chemical signals from your endocrine system
that control the speed of digestion. The digestive system collects and removes undigested solids, the excretory system filters compounds from the blood stream and collects them in urine. They are closely connected in controlling the aount of water in your body," states Biology4Kids

ANALOGY
The digestive system is like a sink. The sink takes the waste and grinds it, just like the small intestine. Then the grinded waste is stored in the tubes, like the rectum. And finally, the waste gets deposited, similar to how the pancreas releases waste.

SOURCES

- http://www.biology4kids.com/files/systems_digestive.html
- https://www.sciencedaily.com/terms/salivary_gland.htm
- http://study.com/academy/lesson/pharynx-anatomy-definition-quiz.html

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