teeth

Salivary glands

oesophagus

Gall bladder

liver

Large intestine

anus

rectum

Small intestine

pancreas

stomach

Label this diagram of the DIGESTIVE SYSTEM

STARTERMore realistic digestive

system anatomy

LEARNING OUTCOMES

Enzymes in digestion

ALL Label the anatomy of the digestive system

MOST Explain how and why large molecules such as starch, protein and fats are broken down

SOME Explain the importance of bile in fat digestion

ENZYMES IN DIGESTION

Large molecules are insoluble and cannot

pass through the walls of the small intestine

into the blood

Enzymes catalyse the breakdown of large insoluble molecules

into small soluble ones

These can then be absorbed in to the blood

STARCH

…to GLUCOSE

PROTEIN

…to AMINO ACIDS

FATS

…to GLYCEROL &

FATTY ACIDS

Large molecules to Small onesLarge molecules to Small ones

Complete the table on page 9 in your work book using this slide AND

reading through page 182 of the

text book

Digestion occurs in three places…

LIPASE

Small intestineAlkali pH

Acid pH

Bile

Produced by the liver and stored in the gall bladder

ISA effect of bile on lipase

Ensure that you are working safely by

following the safety advice of your teacher!

Lipase works best at alkali pH

LEARNING OUTCOMES

Enzymes in digestion

ALL Label the anatomy of the digestive system

MOST Explain how and why large molecules such as starch, protein and fats are broken down

SOME Explain the importance of bile in fat digestion

Plenary

Answer the practice exam question