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The Alimentary Canal. Standard Grade Biology. Can you sort out the statements into True and False?. Carbohydrates, proteins and fats are all made up of carbon, hydrogen, nitrogen and oxygen. Fats are made up of smaller units called amino acids. Starch is a large carbohydrate molecule.

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The Alimentary Canal

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The alimentary canal l.jpg

The Alimentary Canal

Standard Grade Biology


Can you sort out the statements into true and false l.jpg

Can you sort out the statements into True and False?

Carbohydrates, proteins and fats are all made up of carbon, hydrogen, nitrogen and oxygen.

Fats are made up of smaller units called amino acids

Starch is a large carbohydrate molecule

Proteins are made up of one or more glucose molecules

Starch molecules can be broken down by amylase.

Proteins are important for the growth and repair of cells


Can you name the 2 different ways we breakdown food in our bodies l.jpg

Can you name the 2 different ways we breakdown food in our bodies?

  • Mechanical Digestion

    -teeth

  • Chemical Digestion

    -enzymes

    -bile

    -stomach acid


1 parts of the alimentary canal l.jpg

1. Parts of The Alimentary Canal

The alimentary canal (or gut) is the tube within the body through which food passes and is processed in various ways


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mouth

salivary glands

oesophagus

liver

stomach

pancreas

large intestine

small intestine

anus


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2. Role of the Mouth

Teeth assist the mechanical breakdown of food

Saliva is mixed with food during chewing

Saliva contains the enzyme amylase which starts the digestion of food

Salivary gland

Saliva contains mucus that keeps the mouth moist and lubricates food for easier swallowing

Salivary gland

Salivary gland


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3. Muscles of the Alimentary Canal

  • Food has to be kept moving along the alimentary canal whilst being mixed with various juices

  • These actions are brought about by muscles in the walls of the canal over which a person has little or no conscious control


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3.Peristalsis

The squeezing action of muscles that is used to move food along the alimentary canal

http://www.lionden.com/peristalsis.htm


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Digestive Enzymes

  • What do the following enzymes breakdown?

  • What do they break the large moleculs down into?

  • Amlyases

  • Lipases

  • Proteases


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Digestion

‘the breakdown of large insoluble molecules into soluble molecules’


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Digestion and Digestive Juices

Saliva

GASTRIC JUICE

Bile

PANCREATIC JUICE

INTESTINAL JUICE


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Sites of production of main digestive juices


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Digestion and Digestive Juices

  • SALIVA

  • Salivary amylase

  • GASTRIC JUICE

  • Hydrochloric acid

  • Pepsin (protease)

Bile

  • PANCREATIC JUICE

  • Pancreatic lipase

INTESTINAL JUICE


In the mouth l.jpg

In the Mouth…

Starchmaltose

  • Broken down into glucose later by other amylases

Salivary amylase


In the stomach l.jpg

In the stomach

Proteinpeptides

Broken down into amino acids later by other proteases

pepsin


In the pancreas l.jpg

In the pancreas….

Fatsfatty acids and glycerol

Pancreatic lipase


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After all the digestive enzymes have done their work…

  • Glucose

  • Amino acids

  • Fatty acids

  • Glycerol


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Finish the sentence….

  • Something new I learnt today was…..

  • Something I found difficult to understand was…

  • The thing I need to revise from today’s lesson is…


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