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Enzymes in Digestion
GCSE Biology…read more

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What are Enzymes?
· Enzymes are biological catalysts.
· A catalyst is a substance which increases
the rate of reaction without ever being
used up
· They are made of protein
· Each enzyme has a unique shape and
only catalyses one particular reaction…read more

Slide 3

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How do Enzymes work?
· An enzyme floats towards the substance it
is going to break down ­ called the
· They meet and form the enzyme-
substrate complex.
· The enzyme divides it and they separate.…read more

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· To work, enzymes need the correct
temperature and pH.
· The optimum temperature is around 40oC
· Too high, and the enzyme will lose its
shape, becoming denatured
· Too low, and the particles will not have
enough energy to make collisions
· The body provides the optimum
temperature and pH for all the enzymes
that it needs to work…read more

Slide 5

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The mouth
When you eat food, it first enters the mouth.
· You break down the food physically
· Amylase is secreted in the saliva to break
down carbohydrates into simple sugars
· The body provides the right temperature
and neutral conditions for the enzymes
· You swallow the food into the stomach…read more

Slide 6

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The stomach
Next, the food enters the stomach.
· You break down the food physically (the
walls of the stomach pummel the food to
break it down)
· Protease (pepsin) converts proteins into
amino acids
· The body provides a warm environment
and hydrochloric acid to make the ideal pH
for protease.…read more

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