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The Journey Inside

The Digestive System

Jessica Parker

on 14 January 2013

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Transcript of The Journey Inside

By Jessica Parker The Journey Inside Once Upon a Time... The Stomach Ronald was in the mood for a McDonald's cheeseburger. When he sat down to eat, he thought about the process his burger would undergo: digestion. The Large Intestine First, Ronald ingests the cheeseburger. Ingestion is the process of taking food into the body through the mouth.

Here, the tongue and 32 teeth help to chew food and break it into smaller pieces, which is called mechanical digestion The salivary glands (parotid, submandibular, and sublingual) also help to break down food in the mouth by producing enzymes

Amylase is produced by the glands and helps to digest starch into smaller molecules

This enzyme helps break down the bun, which is composed of carbohydrates

This is called chemical digestion- the process in which chemicals or enzymes break down food in the body After being chewed and swallowed, the food enters the pharynx- the first bit of tubing the food passes through after it leaves the mouth.

The epiglottis is a flap of cartilage that prevents food from going down the larynx and into the lungs.

From here, it enter the esophagus- a long tube that runs from the mouth to the stomach.
It uses rhythmic, wave-like muscle movements (called peristalsis) to force food from the throat into the stomach. The Mouth Once in the stomach, the burger mechanically and chemically digests even further

Mechanical: the stomach contracts and mixes food to break it down further

Chemical: The enzyme pepsin helps break down proteins such as the hamburger meat

The process of absorption into the blood stream also begins here The Small Intestine Salivary Glands 1. Duodenum- more chemical digestion
The enzyme, amylase, breaks down carbohydrates
Trypsin breaks down more proteins
Lipase begins the breakdown of lipids (fats)- this would be the cheese and meat on the burger

2. Jejunum
Carbs and proteins that were previously broken down are absorbed into the blood stream for various cell functions

3. Ilium
Fats are absorbed into the blood stream here because the lining has bigger pores Pancreas Pumps out juice that neutralizes stomach acid in the small intestine

Produces enzymes:
Lipase The Liver Bile is produced here but is stored in the gallbladder and sent to the Duodenum through a duct to neutralize stomach acid

Bile emulsifies fats (separates it into small droplets) so they can mix with water and be acted upon by enzymes. The parts of the food that can’t be digested get pushed into the large intestine, also called the colon

Its function is to move the waste from the small intestine on to the rectum and it does this through propulsion

The absorption of water takes place while it moves to the rectum Propulsion, or involuntary muscle movements, move food through the small intestine The Rectum The lowermost segment of the large intestine

It stores the firm waste until you are ready to get rid of it by defecation

Feces exits the body through an opening at the end of the digestive system called the anus After thinking about all this, Ronald takes a big bite! The End!
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