The Circulatory System
The collection of blood vessels, also known as the circulatory
system, is differentiated into several types of vessels.
Blood leaves the heart through large vesels called arteries, which
then split up into smaller ones called arterioles. Those carry blood
to near the tissue that requires oxygen, where they split up into many
small vessels called capillaries. It is in the capillaries that
gas exchange takes place.
After passing through the capillaries, blood
is no longer oxygen-rich and is called venous blood. It is collected
into larger vessels called venules, which join together into large
ones called veins. Veins lead back to the heart, where blood gets pumped to the lungs.
In the lungs the blood exchanges carbon dioxide for oxygen and
becomes oxygen-rich, or arterial blood again. From there it comes back to the heart,
where its journey around the body starts once again.
M & B Exhibits | intro
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