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Unit 19: Biology Part 2 Page 48 of 137
If blood is traveling through a The heart is made of four sections,
blood vessel, and the vessel gets or chambers. The two chambers at
cut, the platelets will stick to the the top of the heart are called the
cut area. These small particles left atrium and right atrium.
then release chemicals called The two chambers at the bottom of
clotting factors. The clotting the heart are called the left
factors form a web of protein, ventricle and right ventricle.
which catches red blood cells
leaving the body through the cut.
In this way, blood stops leaving the
body and bacteria are stopped
from entering.
Figure 23 – A web of protein is
created that catches RBC’s and
stops blood from leaving the
body. Figure 24 – The heart Is the
most important organ in the
The heart is the most important cardiovascular system
organ in the cardiovascular
system. You may have seen The job of the atria (that’s the
pictures of the heart like the one plural of atrium) is to get blood
below before, and you may have from the other parts of the body.
heard your heart beat when you The job of the ventricles is to pump
were at the doctor’s office, but you the blood from the heart to other
may never have thought about parts of the body. We’ll worry
what the heart was actually made about exactly where the atria are
of. getting the blood from and where
the ventricles are sending it to a
little later. For now, just make
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