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What most people know about blood is that if you lose a lot of it, you'll probably die. Even though that's good to know, haven't you ever wondered what blood is made of? It's traveling throughout your body 24 hours a day, seven days a week, so you might want to get to know it a little better.
First of all, blood is more than the red stuff you see when you bleed. (It isn't even red until it hits the air. Isn't that weird?) Blood is made up of components: red blood cells, white blood cells, platelets and plasma .
Red Blood
Cells- A single drop of blood contains
millions of red blood cells, which travel
throughout your body constantly delivering
oxygen and removing waste. They contain a
protein chemical called hemoglobin which
contains the element iron which facilitates
the transportation of oxygen and carbon
dioxide. As blood passes through the lungs,
oxygen molecules attach to the hemoglobin and
are released as the blood passes through the
body's tissue. Over time, red blood cells
wear out and get replaced -- they do
not die because they were never alive.
The average
useful time span of a red blood cell is 120 days.
To keep fresh red cells in your body, your
bones continually produce them. Because of
this continual production of blood cells,
it is safe for healthy adults to donate blood
every 56 days. (Note that red
blood cells do not, themselves, reproduce.
Each red blood cell is "produced" within the
bone marrow. The red blood cell is
quite different from other cells in the body.
The red blood cell is like a bag traveling
from the lungs throughout the body. On
the outward trip the bag gives up the oxygen
it has absorbed in the lungs and receives
waste products from the body. Then,
when it gets to the lungs, again, it gives up
the waste products, mostly carbon dioxide,
and grabs some new oxygen. It then starts the
trip again. It is not "alive" because
it cannot reproduce, but it "wears out about
every 120 days. Thus the "originating cells"
in the bone marrow constantly create new red
blood cells which do their trips.)
White Blood
Cells- One way to think of the white blood
cells in your body is to think of them as
your internal military defense system. When
germs or infection
are present in your body, the white blood
cells take charge and wage war against the
enemy. They handle germs and infection in a
couple of ways. Sometimes they produce
antibodies that overpower the culprits. Other
times white cells surround and devour the
bacteria. Most white blood cells have a very
short life span -- from a few hours to a few
days. If you are healthy, you will have
anywhere from 7,000 to 25,000 white cells in
a single drop of your blood. If infection
becomes present, that number will increase
significantly. If the number of white cells
remains high for a long period of time, this
could signify a serious illness such as
leukemia which is cancer of the blood.
Leukemia patients may have as many as 50,000
white blood cells in a single drop of blood.
Platelets -
Since the body doesn't like to lose a lot of
blood, it contains a remedy in case the worst
happens. Platelets are odd-shaped,
colorless bodies present in the blood. Their
sticky surface allows blood to clot.
Plasma - Also known as an
internal transport system, plasma is a
straw-colored, liquid portion of the blood,
transporting the components, water and
nutrients to all cells of the body. Plasma
makes up about 55 percent of the total
volume of blood.
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