Digestion- foundation level

Digestion- foundation level - Digestion You are a tube...

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Digestion
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You are a tube inside a tube… The tube starts here: And although there are a few twists and turns along the way… It comes out here: Anything that goes in the top hole (mouth) does not become part of the body until it is absorbed (taken in) in a part called the small intestine. This tube is called the GUT .
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A closer look at absorption… Food is absorbed (taken in) to the body in the small intestine. The wall of the small intestine has small holes in it. Only small particles can pass through it: starch starch starch starch G G G GUT INSIDE THE BODY (BLOOD) Large particles (e.g. starch) are left in the gut and small particles (e.g. glucose) go through into the blood. G G G BUT large particles can be broken down into  small particles.  This is called DIGESTION
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TASK: Copy and complete this diagram underneath Question 8 on your worksheet: starch starch starch starch G G G GUT INSIDE THE BODY (BLOOD) G G G BEFORE ABSORPTION GUT INSIDE THE BODY (BLOOD) AFTER ABSORPTION
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What is the gut? The gut is a coiled tube where food is broken down (digested) and absorbed into the body. Any waste food is passed out of the body through the anus.
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Proof! We can demonstrate the need for digestion using a model gut. Visking Tubing has the same small holes in it. If we put a mixture of starch and glucose into it, which one will go through the holes?
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The Model Gut experiment
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A journey through the gut For the rest of this topic we will be taking a trip through the gut from the starting hole (mouth) to the ending hole (anus). What are the parts of the gut? What will we see on the way?!
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Tour map
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Tour guide Mouth Teeth Amylase enzyme (What are enzymes???) Oesophagus peristalsis Stomach Protease enzyme Enzymes and pH Pancreas Amylase, Protease and Lipase Enzymes Small intestine (5 metres long!!) Amylase, Protease and Lipase Enzymes Absorption Large intestine egestion
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Tour guide Mouth Teeth Amylase enzyme (What are enzymes???) Oesophagus peristalsis Stomach Protease enzyme Enzymes and pH Pancreas Amylase, Protease and Lipase Enzymes Small intestine Amylase, Protease and Lipase Enzymes Absorption Large intestine egestion
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Teeth Teeth are needed to tear, rip and chew food to physically break it into smaller pieces. Let’s look at the internal structure of teeth. You will need to cut up a copy of Worksheet 1 now.
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Teeth The crown is the part of the tooth above the gum line The root is the part of the tooth below the gum line The enamel is the white part you can see covering the crown. Enamel is the hardest substance in the human body It covers the dentine and stops bacteria getting inside the tooth
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The crown is the part of the tooth above the gum line The root is the part of the tooth below the gum line The dentine is the major component within the tooth. It is made from softer
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This note was uploaded on 11/23/2011 for the course BIO 100 taught by Professor Robinson during the Fall '08 term at BYU.

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Digestion- foundation level - Digestion You are a tube...

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