3. INTRODUCTION
• Nutrition involves the feeding ability of an
organism.
• Heterotrophic organisms feeds on the six (6)
classes of food.
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4. INTRODUCTION CON'D
• They are;
1. Carbohydrates e.g. yam, rice, cassava e.t.c.
2. Proteins e.g. milk, meat, egg, fish e.t.c.
3. Fats and oil e.g. groundnut oil, palm oil e.t.c.
4. Mineral salts; theses are obtained from table salt,
fruits and vegetables. e.g. sodium, calcium salts
e.t.c
5. Vitamins; these are obtained from fruits and
vegetables. e.g. Vitamin A, D, E, K, B1, B2 e.t.c.
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6. Digestion
• Digestion involves the breakdown of food into
smaller components, until they can be
absorbed and assimilated into the body.
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7. Digestive System
• Digestive system consists of the
gastrointestinal tract (GIT) and the accessory
organs of digestion.
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8. • The parts that are involved in digestion are;
1. The mouth (which contains the tongue and
the salivary glands).
2. Oesophagus.
3. Stomach.
4. Liver.
5. Gall bladder.
6. Pancreas.
7. The Intestines (small and large intestines).
8. Anus
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9. Diagram of the Digestive System of a Bird (Chicken)
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10. Diagram of the Digestive System of man
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11. END PRODUCTS OF DIGESTION
• The end products in the digestion of;
1. carbohydrates are simple sugars (i.e. glucose,
fructose and galactose).
2. proteins are amino acids.
3. Fats and oil are fatty acids and glycerol.
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12. QUESTION SECTION
1. What is Nutrtion?.
2. Define Digestion.
3. Mention the 2 types of Digestion.
4. ........... breaks down food molecules during
Digestion.
5. List the 4 major processes that takes place in the
Digestive system.
6. Enumerate 5 parts of the Digestive system.
7. Where does the absorption of food takes place in the
Digestive system?.
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13. ANSWER SECTION
1. Nutrition involves the feeding ability of an
organism.
2. Digestion involves the breakdown of food into
smaller components, until they can be absorbed and
assimilated into the body.
3. a. Mechanical digestion. b. Chemical digestion.
4. Enzymes.
5. a. Ingestion. b. Digestion. c. Absorption. d.
Ejection.
6. a. Mouth. b. Oesophagus. c. Stomach.
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