Cells and Systems - Digestion notes
November 26, 2014
Body Systems
1. Carbohydrates (sugar and
Digestive System
Living organisms require
energy to survive.
2. Lipids (fats and oils)
3. Protein (meat and legumes)
This food energy must be
processed by the digestive
system in order for the body to
use it.
1. Mechanical digestion –
of food into very small pieces.
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Cells and Systems - Digestion notes
2. Chemical digestion – involves
November 26, 2014
Parts of the Digestive System
The digestive system is a long
particles into smaller particles
.
by substances called
1. Mechanical – teeth
2. Chemical – saliva (contains
water and enzymes called
Salivary Amylase
digests large starch molecules
covers the trachea (wind pipe),
in a wave like movement called
Peristalsis.
Peristalsis is caused by
tissue.
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Cells and Systems - Digestion notes
November 26, 2014
1. Mechanical – muscles churn
2. Chemical – Gastric juices,
water, and digestive enzymes
smaller particles. The food (now
a liquid) is released into the
– chemical
Pancreas sends digestive
released by the small intestine,
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Cells and Systems - Digestion notes
November 26, 2014
Gall bladder – stores bile, which
smaller droplets. The bile is
.
Liver.
Tissue
stream.
The inner surface of the small
intestine is covered by
small, finger-like projections,
that increase the small
intestines surface area.
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