UNIT
3
Systems of nutrition
THE RELATION BETWEEN THE
SYSTEMS INVOLVED IN NUTRITION
Biology and Geology 3. Secondary Education
UNIT
UNIDAD
3
3
Relation between the systems involved in nutrition
SYSTEMS INVOLVED IN NUTRITION
HOW THE EXCHANGE OF SUBSTANCES TAKES PLACE
Biology and Geology 3. Secondary Education
UNIT
UNIDAD
3
3
Relation between the systems involved in nutrition
• Imagine that this drawing represents a
human.
Inside our
body
• As with all multicellular organisms,
most of the cells in our body are not in
contact with the external environment.
• However, they need to exchange
substances with the outside.
Cells of our body
External
environment
How do they manage it?
Biology and Geology 3. Secondary Education
UNIT
UNIDAD
3
3
Relation between the systems involved in nutrition
• To “help” the cells, our body has various
specialised systems for the exchange of
substances with the exterior.
• We will represent them in the drawing
like this…
These are:
Biology and Geology 3. Secondary Education
UNIT
UNIDAD
3
3
Relation between the systems involved in nutrition
The digestive system…
Biology and Geology 3. Secondary Education
UNIT
UNIDAD
3
3
Relation between the systems involved in nutrition
…the respiratory system…
Biology and Geology 3. Secondary Education
UNIT
UNIDAD
3
3
Relation between the systems involved in nutrition
…and the excretory system
Biology and Geology 3. Secondary Education
UNIT
UNIDAD
3
3
Relation between the systems involved in nutrition
• In addition, our organism has two systems
which transport substances all around the
body:
the circulatory system (with blood)…
Biology and Geology 3. Secondary Education
UNIT
UNIDAD
3
3
Relation between the systems involved in nutrition
…and the lymphatic system
(with lymph)
Biology and Geology 3. Secondary Education
UNIT
UNIDAD
3
3
Relation between the systems involved in nutrition
SYSTEMS INVOLVED IN NUTRITION
HOW THE EXCHANGE OF SUBSTANCES TAKES PLACE
Biology and Geology 3. Secondary Education
UNIT
UNIDAD
3
3
Relation between the systems involved in nutrition
These systems permit the exchange of substances between the cells and the exterior.
To find out how the exchange of substances takes place in each one of these systems,
CLICK on the buttons.
• Exchange of substances in the digestive system
• Exchange of substances in the respiratory system
• Exchange of substances in the circulatory system
and in the lymphatic system
• Exchange of substances in the excretory system
and in other organs
Biology and Geology 3. Secondary Education
UNIT
UNIDAD
3
3
Relation between the systems involved in nutrition
Exchange of substances in the digestive system
We ingest
food
Nutrients
• The digestive system obtains
the nutrients contained in food…
• …and passes them into the
transportation systems.
Biology and Geology 3. Secondary Education
UNIT
UNIDAD
3
3
Relation between the systems involved in nutrition
These systems permits the exchange of substances between the cells and the
exterior.
To find out how the exchange of substances takes place in each one of these systems,
CLICK on the buttons.
• Exchange of substances in the digestive system
• Exchange of substances in the respiratory system
• Exchange of substances in the circulatory system
and in the lymphatic system
• Exchange of substances in the excretory system
and in other organs
Biology and Geology 3. Secondary Education
UNIT
UNIDAD
3
3
Relation between the systems involved in nutrition
Exchange of substances in the respiratory system
We take in air
• The respiratory system
enables us to take in air from
the exterior…
• … and so the oxygen from
the air passes into the blood.
Biology and Geology 3. Secondary Education
Oxygen
UNIT
UNIDAD
3
3
Relation between the systems involved in nutrition
These systems, the exchange of substances between the cells and the exterior.
To find out how the exchange of substances takes place in each one of these systems,
CLICK on the buttons.
• Exchange of substances in the digestive system
• Exchange of substances in the respiratory system
• Exchange of substances in the circulatory system
and in the lymphatic system
• Exchange of substances in the excretory system
and in other organs
Biology and Geology 3. Secondary Education
UNIT
UNIDAD
3
3
Relation between the systems involved in nutrition
Exchange of substances in the circulatory system
and in the lymphatic system
• The blood and lymph carry
the nutrients and oxygen to
the cells throughout the body.
Nutrients
Oxygen
Biology and Geology 3. Secondary Education
UNIT
UNIDAD
3
3
Relation between the systems involved in nutrition
Exchange of substances in the circulatory system
and in the lymphatic system
• The cells use the nutrients and
oxygen to obtain energy and
perform their functions.
• They produce CO2 and other
waste substances, which they expel.
These are collected by the transport
systems and carried to the systems
that expel them from the body.
Biology and Geology 3. Secondary Education
Waste
CO2
UNIT
UNIDAD
3
3
Relation between the systems involved in nutrition
These systems permits the exchange of substances between the cells and the
exterior.
To find out how the exchange of substances takes place in each one of these systems,
CLICK on the buttons.
• Exchange of substances in the digestive system
• Exchange of substances in the respiratory system
• Exchange of substances in the circulatory system
and in the lymphatic system
• Exchange of substances in the excretory system
and in other organs
Biology and Geology 3. Secondary Education
UNIT
UNIDAD
3
3
Relation between the systems involved in nutrition
Exchange of substances in the excretory system and
in other organs
• The respiratory system takes the CO2
from the blood and expels it in exhalation
• Many of the other waste products are
collected by the blood and the
excretory system and are expelled in
the form of urine.
• The same is true of the sweat glands,
which expel waste in the form of sweat.
Biology and Geology 3. Secondary Education
Waste
CO2
UNIT
UNIDAD
3
3
Relation between the systems involved in nutrition
All these processes take place at the same time
Go to the activities,
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menu,
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Biology and Geology 3. Secondary Education
UNIT
UNIDAD
3
3
Activities
Relation between the systems involved in nutrition
1. Explain what each one of the arrows represents.
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Biology and Geology 3. Secondary Education