Circulatory
System
By Kyle & Tristen
How Does Blood Circulate?
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Your body has structures and systems that serve
special functions.
The circulatory system moves material around your
body.
The parts of the circulatory system are the heart,
the blood, and tubes called blood vessels.
The Body’s Transportation
System
 The
body has a transportation system that
moves food and oxygen to each cell. It
then takes away cell wastes.
 This system is the circulatory system.
 As with all systems, each part of the
circulatory system has structures to help
get the job done.
Arteries, Capillaries, and Veins
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Arteries are blood vessels that carry blood away from
the heart to other parts of the body. Arteries have thick
muscular walls that stretch as the heart pushes blood
into them.
A capillary is the smallest kind of blood vessel. Some
capillaries are so small that red blood cells have to
travel through them in a single file line.
Veins are blood vessels that transport blood to the
heart. Unlike arteries and capillaries, veins have valves.
Valves are flaps that act like doors to get the blood
flowing in one direction.