Digestion- foundation level

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Slide 1

Digestion

Slide 2

You are a tube inside a tube…

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.

Slide 3

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

Slide 4

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

Slide 5

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.

Slide 6

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?

Slide 7

The Model Gut experiment

Slide 8

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?!

Slide 9

Tour map

Slide 10

Tour guide

Mouth

Teeth

Amylase enzyme (What are enzymes???)

Oesophagus

peristalsis

Stomach

Protease enzyme

Enzymes and pH

Pancreas

Amylase, Protease and Lipase Enzymes