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The Circulatory System
The circulatory system consists of heart and blood
vessels. It can be described as the transport system
of the body. Oxygen and nutrients are transported to
all parts of the body in the blood. Waste products
such as carbon dioxide and water are taken away.
BLOOD:-
Blood has two functions transport and body
defence.
It is made up of four main substances…read more

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Blood
Blood has two functions transport and body
defence.
It is made up of four main substances:-
Plasma
Red Cells
White Cells
Platelets…read more

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Blood Composition…read more

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Plasma
This is a pale yellow liquid making up about
55% of the blood. About 90% is water, the rest
being hormones, food and waste products of
the body. Plasma flows through the blood
vessels transporting cells and other
substances to all parts of the body.…read more

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Red Cells
Red cells contain a substance called
Haemoglobin. When blood passes through the
blood vessels of the lungs, the haemoglobin
attracts oxygen, forming oxyhaemoglobin.
The blood the transports oxygen to all parts
of the body in the red cells.…read more

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