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Purpose and Function of the Circulatory System (Fill in the blanks using the terms below.)
contracts capillaries oxygen
valves
exchange arteries veins
The function of the circulatory system is to transport.
and carry
wastes
and
nutrients
to cells
away from cells to the organs responsible for eliminating them from the body.
The heart is a muscular pump. When the heart
it produces pressure on the
blood in the circulatory system. This pressure pushes blood through the body. The body travels
away from the heart in vessels called
It returns to the heart through vessels
called
To stop blood from flowing backwards, flexible flaps of tissue called
are found throughout the circulatory system in the heart and veins. Arteries and veins
are connected
by tiny
, thin-walled vessels called
These very small vessels are
of nutrients, wastes,
in close contact with the organs and tissues of the body. The
oxygen and carbon dioxide occur between tissues and the blood through the walls of these small
vessels.