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UWCSEA Digestive System

A closer look at digestion and the main parts of the digestive system.
by

Martin Spreckley

on 30 March 2013

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Transcript of UWCSEA Digestive System

Digestion The Journey
begins here A closer look at the main parts of the digestive system 1. The mouth 2 types of digestion occur here: Physical Digestion The Oesophagus There are different ways of spelling this!
(esophagus) 2. The Oesophagus Chewing food breaks it up into smaller pieces making it easier to swallow. Chemical Digestion Enzymes in your saliva called amylase breaks down some carbohydrates (large starch molecules) into smaller glucose molecules. This muscular tube squeezes the food from your mouth down into the stomach by muscular contractions called peristalsis Squeeze, squeeze, squeeze This is why you can even eat when standing on your head! 3. The Stomach The Stomach The Small intestine 4. The small intestine It's over 6 metres long!
The small intestine breaks down the food mixture even more so your body can absorb all the vitamins, minerals, proteins, carbohydrates, and fats.
Your food may spend as long as 4 hours in the small intestine and will become a very thin, watery mixture. It's time well spent because, at the end of the journey, the nutrients from your pizza, orange, and milk can pass from the intestine into the blood. Once in the blood, your body is closer to benefiting from the complex carbohydrates in the pizza crust, the vitamin C in your orange, the protein in the chicken, and the calcium in your milk. The stomach has 3 main jobs:
1. to store the food you've eaten.
2. to break down the food into a liquidy mixture (called chyme).
3. to slowly empty that liquidy mixture into the small intestine.
Protein stays in your stomach for longer than other food groups and is broken down by protease.
Hydrochloric acid kills micro organisms. And off to the large intestine Things could get messy.... 5. The Large intestine Fatter than the small intestine, the large intestine is about 1.5 metres long.
Water and some minerals are removed from here so if the waste products stay here too long your poop gets hard - constipation.
After the nutrients are removed from the food mixture only is left over — stuff your body can't use. This stuff needs to be passed out of the body.... The large intestine pushes the poop into the rectum - the very last stop on the digestive journey. The solid waste stays here until you are ready to go to the bathroom. When you go to the bathroom, you are getting rid of this solid waste by pushing it through the anus. The rectum The liver UWCSEA: Grade 7 Science Large intestine Nutrients found in a burger: Carbohydrates (in the bread bun)
Proteins (in the beef/chicken)
Fats (in red meat and cheese)
Vitamins and minerals (in the salad) 6. The rectum (and anus) It's ok - It's not a real poo. The liver produces bile which helps absorb fat (see gallbladder).
It also plays a major role in the handling and processing of nutrients, which are carried to the liver in the blood from the small intestine. Liver Gallbladder Bile is stored in the gallbladder until it is needed. Then it is sent directly to the small intestine to help digest the fat in the food you eat. Pancreas The pancreas produces enzymes that help digest proteins, fats, and carbs. It also makes a substance that neutralizes stomach acid. Mouth You can also click on the other organs (liver, pancreas, gallbladder to find out about their role in digestion. Feeling brave?
Watch the video... (Click it to play)
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