Slides in this set

Slide 1

Preview of page 1

Chapter 2
Enzymes And The
Digestive System…read more

Slide 2

Preview of page 2

2.1 Enzymes And Digestion
Absorption ­ taking soluble molecules into the body.
Assimilation ­ incorporating absorbed molecules into body tissues.…read more

Slide 3

Preview of page 3

2.1 Enzymes And Digestion
Carries food from the mouth to the stomach
Adapted for transport rather than digestion or absorption.
Made up of a thick muscular wall.
Muscular sac with an inner layer that produces enzymes.
Its role is to store and digest food, especially proteins.
It has glands that produce enzymes which digest proteins.
Other glands in the stomach wall produces mucus.
Mucus prevents the stomach being digested by its own enzymes.…read more

Slide 4

Preview of page 4

2.1 Enzymes And Digestion
Small Intestine:
It is a long muscular tube.
Food is further digested here by enzymes that are produced by its
walls and by glands that pour their secretions into it.
Inner walls are folded into villi, which gives them a large surface
Surface area of these villi is further increased by millions of tiny
projections, called microvilli, on the epithelial cells of each villus.
This adapts the small intestine for its purpose of absorbing the
products of digestion into the bloodstream.…read more

Slide 5

Preview of page 5

2.1 Enzymes And Digestion
Large Intestine:
Absorbs water.
Most of the water that is reabsorbed comes from the secretions of
many digestive glands.
Therefore the food within the large intestine becomes drier and
thicker in consistency and forms faeces.
Final section of the intestines.
Faeces are stored here before periodically being removed via the
anus in a process called egestion.…read more

Slide 6

Preview of page 6

2.1 Enzymes And Digestion
Salivary Glands:
Situated near the mouth.
They pass their secretions via a duct into the mouth.
These secretions contain the enzyme amylase, which breaks
down starch into maltose.
It is a large gland situated below the stomach.
Produces a secretion called pancreatic juice.
This secretion contains proteases to digest proteins, lipase to
digest lipids and amylase to digest starch.…read more

Slide 7

Preview of page 7
Preview of page 7

Slide 8

Preview of page 8
Preview of page 8

Slide 9

Preview of page 9
Preview of page 9

Slide 10

Preview of page 10
Preview of page 10


No comments have yet been made

Similar Biology resources:

See all Biology resources »