Digestive System Mika Kraass 10A

The mouth is the beginning of the digestive system it is where everything starts. The mouth breaks down the food into smaller pieces using your teeth this is done so that it is easier to digest. The tongue than covers the food with saliva.

The esophagus is located near the trachea also known as the windpipe. The esophagus is the second step of the digestive system and therefore receives the chewed food from the mouth. The esophagus is like a highway for food its job is to transfer food from the mouth to the stomach.

http://www.livescience.com/52045-esophagus.html

Partial digestion of the food takes place in the stomach. The churning action that the stomack makes breaks Down the food. The stomack releases acids and enzymes for the chemical breakdown of the Food. The stomach uses the enzyme pepsin for protein break down. After this the stomach releases the food into the small intestine, these amounts are regulated.

http://www.laparoscopic.md/digestion/stomach

The small intestine is the largest organ in the digestive system. It is on average 7meters long. The small intestine absorbes roughly 90% of the nutrients in the food. The small intestine is divided into three parts: The duodenum, the jejunum and the ileum. The duodenum is the first and smallest part of the small intestine, it connects to the stomach. The jejunum is the second part of the small intestine. This is also the main part of the organ for nutrient absorption. The ileum is the last part of the small intestine. It absorbs all the nutrients that werent previously absorbed. The ileum also connects to the large intestine.

http://www.innerbody.com/image_digeov/dige10-new3.html

The function of the large intestine is to extract and absorb all the water and vitamins from the food. The large intestine converts all food into feces. It is called the large intestine because it is a lot thicker than the small intestine.

Once the large-intestine has produced feces out of the food consumed the next step is the rectum. The rectum stores feces before it is then released into the anus. The rectum has walls called rectal walls. When the rectal walls expand the rectum will than let out the feces into the anus. Peristaltic waves push the feces out of the rectum.

http://www.kidport.com/reflib/science/HumanBody/DigestiveSystem/RectumAnus.htm

The anus is the last part of the digestive system. The anus controls the release of feces out of the human body. The muscle that controls the flow of feces is called the sphincter muscle. When the sphincter muscle relaxes it lets the feces be released out of the human body.

http://www.kidport.com/reflib/science/HumanBody/DigestiveSystem/RectumAnus.htm

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