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DOES YOUR BODY REALLY REPLACE ITSELF EVERY 7 YEARS?

By: Gerardo Sison

The human body is constantly renewing itself.

August 01, 2019


It's a beautiful idea, when you think about it: You can leave the old you behind
and become a completely new person every seven years. Unfortunately, it's just
not true. Chances are you can't actually remember where you heard this, but the
truth is that the seven-year myth isn't even a rough average of every cell's
lifespan.




641134582

Cell Division , 3d render





Photo by: Getty Images/Altayb



Getty Images/Altayb




THE BIRTH OF A CELL



To understand how often your cells replace themselves, you need to understand
how cells come into being in the first place. Your body can make new cells in a
couple of ways. First, existing cells can divide via a fairly simple process
called mitosis. During mitosis, a parent cell splits into two new cells. These
new cells, called daughter cells, are basically copies of the original cells.



The second way that cells are created is from stem cells. These are special
cells found throughout the body, although in lower numbers. They're able to not
only create copies of themselves via mitosis but also make new "specialized"
cells. Specialized cells include blood cells and nerve cells, which can't make
copies of themselves.



To control the growth of new cells, old cells also need to die. For example, the
spaces between your fingers and toes are partly due to cell death when you are
born — this programmed cell death is required in order to prevent you from
having webbed hands and feet. After some time, all cells eventually shrivel and
die.




CELLULAR DIFFERENCES



But not every cell's lifespan is the same. For example, the cells that line your
stomach can renew as fast as every two days, since they're often in contact with
digestive acid. Cells that make up your skin are replaced every two to three
weeks. As the main protection against the environment, your skin needs to be in
top shape.



Red blood cells, meanwhile, last for about four months. White blood cells, the
main players in fighting infections, can last from a few days to a little over a
week. In contrast, your fat cells live a fairly long time — an average age of 10
years. The bones in your body also regenerate about every 10 years.



If you think 10 years is a long time, you haven't seen anything yet. Other parts
of your body are just as old as you are. For example, you only get one brain.
Brain cells don't regenerate as you age, although recent studies say that cells
in your hippocampus, the part responsible for memory, can regrow. Your tooth
enamel is never replaced, and the lenses of your eyes are also with you for
life.



Your body is made up of different cells, each with different functions and
lifespans. Just as you need to replace the tires on a car more often than the
transmission, some parts of your body need to be refreshed sooner than others.
Even after all this replacement, though, you're never really a whole new you.
When it comes to certain cells, you're stuck with them for life.



This article first appeared on Curiosity.com.





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WORLD'S FIRST MALARIA VACCINE OFFERS HOPE TO MILLIONS

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caused by malaria following the World Health Organization (WHO) approval of a
first-ever vaccine. Scientists have recommended the RTS,S vaccine for children
in sub-Saharan Africa and other high-risk areas to prevent one of the world’s
oldest and deadliest infectious diseases.


SCIENTISTS HAVE DISCOVERED ENORMOUS BALLOON-LIKE STRUCTURES IN THE CENTER OF OUR
GALAXY

There's something really, really big in the middle of our Milky Way galaxy — one
of the largest structures ever observed in the region, in fact.


THE PERSEID METEOR SHOWER REACHES ITS PEAK

Stargazers rejoice! The annual Perseid meteor shower is upon us. Here's what you
need to know...(updated August 11, 2022)


NEUROPROSTHETIC SENSORY DEVICES ARE RECONNECTING PEOPLE TO THE WORLD

Sensory loss has a profound effect on millions of people’s everyday lives.
Sight, hearing, touch, smell, and taste can all be affected, diminishing their
experience of the world. But now, thanks to neuroprosthetic technology we can
tap into nerve and brain function, and rewire these lost connections.


ASTRONOMERS MAY HAVE FOUND A RARE “FREE-FLOATING” BLACK HOLE

How do you see a perfectly black object in the middle of a pitch-dark night? It
sounds like the start of an annoying riddle, but it’s really the question faced
by astronomers when they want to search for black holes.


WHAT IF DARK MATTER DOESN'T EXIST AND THE LAW OF GRAVITY IS WRONG?

Dark matter and gravity have scientists at odds.


YES, A DONUT-SHAPED PLANET IS TECHNICALLY POSSIBLE

A theoretical planet could form tells us a lot about own planet.







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