19520853 Digestion Science Form 2

8/2/2019 19520853 Digestion Science Form 2

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FOOD CLASSESCARBOHYDRATE

FAT

WATER

VITAMINS,MINERALS, &ROUGHAGE

PROTEIN


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THEME :

MANAGEMENT AND

CONTINUITY OF LIFE

LEARNING AREA :

NUTRITION


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Learning Objectives : Understanding the digestivesystem of man

Learning outcome: A student is able to:explain what digestion isidentify the parts of the digestive systemdescribe the flow of food particles in the alimentary canalstate the functions of the organs in the digestive systemdescribe the process of digestion in the alimentary canallist the end products of digestion of carbohydrate, protein and fats


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MOUTH

OESOPHAGUSLIVER

STOMACH

GALLBLADDER

PANCREAS SMALLINTESTINE

LARGEINTESTINE

ENDPRODUCT

SHORTMOVIE


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The food in the mouth are cut up

and grind into small pieces by theteeth. These food pieces would

provide a bigger surface area for

the enzyme. Food is mixed withsaliva.

Digestive action :Starch maltose (sugar)


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Peristalsis which is caused by the

muscles in the oesophagus pushthe food into the stomachThe movement is supported by the

slippery mucus


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1. The liver produces bile which is an alkalineandkept in the gall bladder

- Bile will digest fat to tiny particles

-This process is called emulsification

2. Pancreas produces pancreatic juice which is analkaline and it has 3 enzymes that can digest :

- Maltose glucose

- Peptone amino acid- Fat fatty acid & glycerol


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Stomach has gastricjuice which consistsof some enzymes and hydrochloric acid.

The functions of hydrochloric acid are:

The half digested food will be sent toduodenum for the next process.

- It provides an acidic medium for theenzymes e.g. renin and pepsin to digestprotein in food.

- It also kills microorganisms such as bacteriawhich enters the stomach.


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Parts of the

digestive

system

Digestive

juice

Enzymes Digestive action Further information

Duodenum Bile

(alkaline)produced

by the liver

and kept in

the gall

bladderPancraetic

juice

(alkaline)

Pancreaticamylase

Protease

Lipase

Fat tiny

particles(A process

which breaks

down the fat

into tiny

particles by thebile which is

called

emulsification)

Maltose

glucosePeptone

amino acid

Fat fatty

acid & glycerol

The result of this

process is theincreased of the

surface area of fat

particles. This would

help the enzyme to

react on the foodmore easily

The bile and the

pancreatic juices

(alkaline) neutralises

the acid from thestomach

MORE


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Small

intestine

(6 metres

long)

Intestinal

juices

from wall

of the

small

intestine

(alkaline)

Erepsin

Several

other

enzymes

to digest

the

complexsugar

Peptone amino

acid

Complex sugar

simple sugar

Maltose glucose

Sukrase glucose

+ fructoseLactase glucose

Digested food is

absorbed by tiny

villi which are

found in the

small intestinal

wall into the

blood stream

Parts of

thedigestive

system

Digestive

juice

Enzymes Digestive action Further

information


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Parts of

the

digestive

system

Digestive

juice

Enzymes Digestive

actionFurther

information

Large

intestineNone None None Absorption of

water and waste

is left.


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LET US HAVE ALOOK AT AN

INTERACTIVE VIEWOF WHAT HAPPEN IN

OUR DIGESTIVETRACT ! ! !

THE END PRODUCTS OF DIGESTION OF


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THE END PRODUCTS OF DIGESTION OFCARBOHYDRATE, PROTEIN AND FAT

CARBOHYDRATE SIMPLE SUGAR GLUCOSE,

( MALTOSE) FRUCTOSE,

GALACTOSE

PROTEIN PEPTONE AMINO ACID

FAT TINY FATTY PARTICLES FATTY ACID &

GLYCEROL


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Procedure: 1 Observe a human digestive model/chart.

Observe the various parts which make up thehuman digestive system.

2 Know the various parts of the human digestiveand label the diagram provided: teeth, tongue,mouth, salivary gland, oesophagus, stomach,

duodenum, small intestine, large ,intestine, liver,pancreas, gal/ bladder, bile duct, anus

Discuss the functions of the various parts of the digestive system.

WorkingMethod:__________________________________________________________________________________________________

____________________________________________________________________________________________________

TASK SHEET


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Observation: State the sequence of the organs which are passed by thefood.

__________________________________________________

__________________________________________________Questions:1 What is digestion?

__________________________________________________

2 What is the advantage of the muscular bag shaped stomach?__________________________________________________3 What is the purpose of having a long small intestine?

____________________________________________________________________________________________________

4 How does food move along the alimentary canal?__________________________________________________5 How is the digested food absorb?

__________________________________________________Conclusion: The digestive system consists of several ____________which helps to _____________ food to simpler particles.


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SUMMARY

WHAT IS DIGESTION? PARTS OF DIGESTIVESYSTEM

THEFUNCTIONSOF THE

ORGANS INTHEDIGESTIVESYSTEM

THE FLOW OFFOODPARTICLESIN THEALIMENTARYCANAL

THE PROCESSOF DIGESTIONIN THEALIMENTARYCANAL

THE ENDPRODUCTS OFDIGESTION OFCARBOHYDRATE,

PROTEIN AND FATS


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PROJECT

Title: Model of the human digestive system

Aim: To enhance the students knowledge about thedigestive system of man.

To prepare items for the Science week .Learning outcome: Pupils will be more knowledgeable

about the digestive systemof a human being.

Materials: Plasticine, plywood, manila card, colourpapers, magic ink pens

supplied by the Science department.Time Allocation: 1 week after finishing the topicconcern.Workgroup: 4/5 pupils


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Suggested Procedures:

Refer to any Science text book or the internet and look up for a

diagram showing a human beings digestive system.

Study the diagram carefully and make a model of the digestivesystem.

Your model must be as accurate proportionally to the actualorgans of the digestive system.

You can add colour or whatever else that you can think of inorder to enhance your model.

Your model must be properly labelled.

The functions of the various organs must also be available.

Extra marks will be given for tidiness.


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THEEND

Documents

19520853 Digestion Science Form 2