Unit 1: Chapter 2: Enzymes and the Digestive System

Powerpoint presentation that uses the specification per slide, uses information from the textbook. I have got word document notes (in a more Q & A style) that go with it if your interested (LINKED BELOW) . Don't know how useful this is, but if it turns out to be, i've got a tonne more.

I tend to work visually so this is why it works well for me.


2.2, 2.3, AND 2.4


2.6, 2.7, AND 2.8

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  • Created by: Marya
  • Created on: 12-12-11 15:39

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Slide 1

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B3.1.2 The digestive system
provides an interface with the
environment. Digestion
involves enzymic hydrolysis
producing smaller molecules
that can be absorbed and
06/10/2011…read more

Slide 2

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B2.1 Enzymes and
Enzyme: Biological Catalyst
Digestion: the breakdown of large molecules (by hydrolysis)
to become soluble small molecules.
(The slightly fun bit)…read more

Slide 3

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The gross structure of the human digestive system limited to oesophagus,
stomach, small and large intestines, and rectum. The glands associated with
this system limited to the salivary glands and the pancreas.
O Salivary Glands: duct, secretions, amylase,
enter mouth starch -> maltose.
O Oesophagus: food from mouth -> stomach.
O Ad: Thick muscle wall
O Function: Transportation
O Stomach: muscular sac, inner layer ->
O Ad: Mucus to prevent stomach from being digested by
it's own enzymes.
O Function: Store and digest food primarily (proteins)
O Small Intestine: long muscular tube
O Ad: walls made up of villi, microvilli
O Function: help food digestion, provide large surface
area for enzyme to work
O Ad: Secretary glands produce digestion enzyme in
the walls
O Function: Absorb digested material to re-enter the
O Large Intestine: water reasborbtion
O Secretion of glands. Small Gorillas Only Sing Idiotic
O Function: food can become drier and thicker to form
feces and be removed. Instrumental Rythms.
O Rectum: egestion
O Food temporarily stored here, before being
removed…read more

Slide 4

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Breakdown of
Chemical Breakdown Physical Breakdown
O Large insoluble O Large food broken
molecules -> Small down by teeth, ingest
soluble molecules food and provide
O Hydrolases large SA.
O Hydrolysis ­ define. O Churned up by
muscles.…read more

Slide 5

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The digestive system
O Interface: surface/boundary linking two
systems (eg. External environment, internal
body environment)
O Food/Water may carry pathogens into the
stomach/intestines via mouth.
O The production of stomach acid (kill
microorganisms), enzymes (break down
pathogens) and mucous prevents the entry
of pathogens.…read more

Slide 6

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! Assimilation:
O "The process of absorbing vitamins,
minerals and other nutrients from food,
during the digestive process,"
O Basically absorbing the good stuff during
digestion.…read more

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