Alimentary Canal - World of Teaching

March 20, 2018 | Author: Anonymous | Category: N/A
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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

Proteins are made up of one or more glucose molecules

Proteins are important for the growth and repair of cells

Starch molecules can be broken down by amylase.

Can you name the 2 different ways we breakdown food in our bodies? 1. Mechanical Digestion -teeth

2. Chemical Digestion -enzymes -bile -stomach acid

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


salivary glands oesophagus

liver stomach pancreas large intestine small intestine anus

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 Salivary gland

Salivary gland

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

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

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

Digestive Enzymes • What do the following enzymes breakdown? • What do they break the large moleculs down into? • Amlyases • Lipases • Proteases

Digestion ‘the breakdown of large insoluble molecules into soluble molecules’

Digestion and Digestive Juices Saliva




Sites of production of main digestive juices Site of digestive juice production Mouth

Main digestive juice produced Saliva


Gastric juice



Bile (breaks down big fat droplets into little fat droplets Pancreatic juice

Small Intestine

Intestinal juice

Digestion and Digestive Juices SALIVA •Salivary amylase


•Hydrochloric acid •Pepsin (protease)


INTESTINAL JUICE •Pancreatic lipase

In the Mouth… Salivary amylase



• Broken down into glucose later by other amylases

In the stomach




Broken down into amino acids later by other proteases

In the pancreas….

Pancreatic lipase


fatty acids and glycerol

After all the digestive enzymes have done their work… • Glucose

• Amino acids • Fatty acids • Glycerol

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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