Alimentary canal 3rd year

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Slide 1

The Alimentary Canal

Standard Grade Biology

Slide 2

Can you sort out the statements into True and False?

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

Starch is a large carbohydrate molecule

Fats are made up of smaller units called amino acids

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

Slide 3

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

Mechanical Digestion

-teeth

Chemical Digestion

-enzymes

-bile

-stomach acid

Slide 4

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

Slide 5

mouth

salivary glands

oesophagus

liver

stomach

pancreas

large intestine

small intestine

anus

Slide 6

Role of the Mouth

Salivary gland

Salivary gland

Salivary gland

Saliva is mixed with food during chewing

Teeth assist the mechanical breakdown of food

Saliva contains the enzyme amylase which starts the digestion of food

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

Slide 7

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

Slide 8

3. Peristalsis

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

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

Slide 9

Digestive Enzymes

What do the following enzymes breakdown?

What do they break the large moleculs down into?

Amlyases

Lipases

Proteases

Slide 10

Digestion

‘the breakdown of large insoluble molecules into soluble molecules’

Slide 11