1. The nutrition function
UNIT 2
The nutrition function
Natural Science 2. Secondary Education
THE NUTRITION PROCESS

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UNIT 2
The nutrition process
Natural Science 2. Secondary Education
NUTRITION
OBTAINING NUTRIENTS
RESPIRATION
SUBSTANCE DISTRIBUTION
EXCRETION
AUTOTROPHIC NUTRITION
HETEROTROPHIC NUTRITION
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3. The nutrition process Obtaining nutrients
UNIT 2
The nutrition process
Natural Science 2. Secondary Education
Obtaining nutrients
Nutrients are the substances (organic or inorganic) that living things ingest and that can be used by their cells.
There are two types of nutrition:
Autotrophic
Heterotrophic
Inorganic substances
Energy
Food
Organic nutrients
Organic nutrients
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4. The nutrition process Autotrophic nutrition
UNIT 2
The nutrition process
Natural Science 2. Secondary Education
Autotrophic nutrition
Autotrophic organisms produce organic nutrients from inorganic substances, such as:
Water
Mineral salts
Carbon dioxide

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The nutrition process
Autotrophic nutrition
One example is photosynthesis. Plants and algae make organic nutrients using the energy from sunlight.
ENERGY
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Natural Science 2. Secondary Education

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The nutrition process
Heterotrophic nutrition
Heterotrophic organisms cannot make organic matter from inorganic matter. Therefore, they obtain nutrients from other organisms or their derivatives.
Animals are an example of heterotrophic organisms.
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Natural Science 2. Secondary Education

7. The nutrition process Respiration
UNIT 2
The nutrition process
Respiration
Respiration is the process where a living organism takes in oxygen and expels carbon dioxide.
This process also takes place in cells, which use oxygen to generate energy from nutrients. Mitochondria are the organelles that carry out cellular respiration.
Carbon dioxide
Oxygen
Natural Science 2. Secondary Education

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The nutrition process
Cellular respiration
In this process, the mitochondrion takes in oxygen, obtains energy from nutrients and expels carbon dioxide and water.
Oxygen
Carbon dioxide
Energy
Water
Carbohydrates
Respiration in a mitochondrion
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Natural Science 2. Secondary Education

9. The nutrition process Substance distribution in unicellular organisms
UNIT 2
The nutrition process
Substance distribution in unicellular organisms
In unicellular organisms, the cell exchanges substances directly with the environment through the membrane.
The exchange of substances in a protozoan
Nutrients
Waste
Natural Science 2. Secondary Education

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The nutrition process
Substance distribution in multicellular organisms
In multicellular organisms, different parts of the body specialise in:
Taking in or expelling substances.
Transporting substances.
The circulatory system of a fish
The digestive system of a bird
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Natural Science 2. Secondary Education

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The nutrition process
Excretion
This is the process by where living beings expel the waste products generated by their activity.
The excretory system of a reptile
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Natural Science 2. Secondary Education