The Digestive System! Science! Making Poo DISCUSS turn into this? - - PowerPoint PPT Presentation

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Apr 01, 2023 612 likes •883 views

The Digestive System! Science! Making Poo DISCUSS turn into this? How does this DISCUSS Were going to take a journey through the digestive system. Before we go, who can tell me why we eat food in the first place? Funny and

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The Digestive System!

Science! Making Poo

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How does this… turn into this?

DISCUSS…

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DISCUSS…

We’re going to take a journey through the digestive

system. Before we go, who can tell

me why we eat food in the first place?

Scientific Funny and fairly scientific

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DISCUSS…

Energy! Well done, we get energy from food… but this doesn’t mean that when we eat a sandwich it floats around

ur body going into our legs

and our muscles!

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DISCUSS…

Let’s take a journey through the digestive system. Who can tell me the first thing we do to our food to get the process going?

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DISCUSS…

We buy it from the shops! Only joking… We CHEW it using

ur teeth. This is called,

MASTICATION. What is next?

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SWALLOWING of course! The tongue actually pushes food to the back of the throat and saliva helps it slide down through our

OESOPHAGUS. Next?

DISCUSS…

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DISCUSS…

The food goes into our STOMACH. Here stomach acids break down the food. Where does it go now?

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DISCUSS…

Our INTESTINES! First the food goes into our SMALL INTESTINE which is actually not very small as it is 22ft long. Then it goes through our LARGE INTESTINE. As it goes through, the nutrients are taken from the food and put into the bloodstream. Next?

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DISCUSS…

We have now used all the energy from the food and can get rid of the WASTE, thus making poo. Poo is stored in the RECTUM and then ejected through the ANUS.

THIS IS CALLED EXCRETION

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Experiment…

Right, it is time for you to make a model of the digestive system. In your groups, discuss what you think each of these could be used for. You will be using some things more than

nce.

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Experiment…

Let’s see if you got it

right. Step 1.

MASTICATION (CHEWING)

TEETH MOUTH

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Experiment…

Let’s see if you got it

right. Step 2.

SWALLOWING

OESOPHAGUS STOMACH

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Experiment…

Let’s see if you got it

right. Step 3.

STOMACH ACID

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Experiment…

Let’s see if you got it

right. Step 4.

SMALL INTESTINE

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Experiment…

We then repeat that step again for the large

intestine. Step 5.

LARGE INTESTINE

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Experiment…

Let’s see if you got it

right. Step 6.

EXCRETION

ANUS

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Experiment…

Simple right?! Ok, now you’re going to do it for real. First things first, make a sandwich!

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Experiment…

Step 1. One of you needs to chew (cut) the sandwich with the scissors in the bowl. Give yourself a bit of a drink too.

TEETH MOUTH

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Experiment…

Step 2. Great job. Now pass the bowl to the next person. You are now going to swallow your food. If it’s hard to swallow it all, have another drink!

Throat Oesophagus Stomach

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Experiment…

Step 3. Now, when your food goes into your stomach, the stomach acid breaks it down. You now need to add some ‘acid’ and give it a swish around. Make sure the bag is closed!

Stomach Acid

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Experiment…

Step 4. Once your stomach has broken down the food, it is time to send the nutrients around the body. We need to go to the small intestine. Pour the mixture through the tights/sock. Make sure the bowl is underneath to catch the nutrients. Give the tights a gentle squeeze.

Small INTESTINE

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Experiment…

Step 5. Now, we go from the small intestine to the large intestine. To save getting really messy we’re going to just imagine that we are now in the large

intestine. You now need to squeeze

the last remaining nutrients out

f your food.

Large INTESTINE

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Experiment…

Step 6. Can you see all the nutrients in the bowl? This is exactly what your body does. As the broken down food moves through your intestines, the nutrients are taken and sent off around the body in the bloodstream. We are now left with the waste food. Who is going to do the honours and create the anus? Cut a small hole in the tights and squeeze your poo into the bowl.

ANUS

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Experiment…

Well done. You made

poo. Now think about your

lunch that you’ve just eaten. The same process is going

n inside each of you right

now!

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How does this… turn into this?

Now that you’ve made your model and seen how the process works first hand, can you explain to the class… or maybe the camera?