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Circulatory System of a Mammal
Why large organisms need a transport system
All organisms need to exchange materials between themselves and
the environment.
As an organism gets bigger, the surface area to volume ratio
decreases to a point where the needs of the organism cannot be met
by the body…

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Page 4

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Features of Transport Systems
Any large organism encounters the same problems in transporting materials within
itself.
The transport systems of many organisms have common features:
A suitable medium in which to carry materials
E.g. Blood This is normally a liquid based on water because water readily dissolves
substances and can…

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Transport Systems in Mammals
Mammals have a low surface area to volume ratio, so they need a specialised transport
system to carry materials from the specialised exchange organs to their body cells.
The system is closed and blood is contained in the vessels.
A muscular pump called the heart circulates…

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Substances are then delivered to the rest of the body quickly, which
is necessary as:
· Mammals have a high temperature
· High rate of metabolism
Blood transports:
· Respiratory gases
· Products of digestion
· Metabolic wastes
· Hormones
The vessels that make up the circulatory system of a…

Page 9

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Page 10

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There are two circuits:
1. Takes blood from the heart to the lungs then back to the heart 2. Takes blood around
the rest of the body

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Pages in this set

Page 1

Preview of page 1

Page 2

Preview of page 2
Circulatory System of a Mammal
Why large organisms need a transport system
All organisms need to exchange materials between themselves and
the environment.
As an organism gets bigger, the surface area to volume ratio
decreases to a point where the needs of the organism cannot be met
by the body…

Page 3

Preview of page 3

Page 4

Preview of page 4
Features of Transport Systems
Any large organism encounters the same problems in transporting materials within
itself.
The transport systems of many organisms have common features:
A suitable medium in which to carry materials
E.g. Blood This is normally a liquid based on water because water readily dissolves
substances and can…

Page 5

Preview of page 5

Page 6

Preview of page 6
Transport Systems in Mammals
Mammals have a low surface area to volume ratio, so they need a specialised transport
system to carry materials from the specialised exchange organs to their body cells.
The system is closed and blood is contained in the vessels.
A muscular pump called the heart circulates…

Page 7

Preview of page 7

Page 8

Preview of page 8
Substances are then delivered to the rest of the body quickly, which
is necessary as:
· Mammals have a high temperature
· High rate of metabolism
Blood transports:
· Respiratory gases
· Products of digestion
· Metabolic wastes
· Hormones
The vessels that make up the circulatory system of a…

Page 9

Preview of page 9

Page 10

Preview of page 10
There are two circuits:
1. Takes blood from the heart to the lungs then back to the heart 2. Takes blood around
the rest of the body

Comments

No comments have yet been made