Inside the Living Body Page #6

We're even losing hairs in lower-frequencies

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they're slowly seizing up

These days we struggle to hear

our sight continues to worsen

The lenses in our eyes become stiffer

and even change color

from clear blue to frosty yellow brown

the result of lifetime exposure to ultraviolet light.

most of us're never aware of this change

our brain just works harder to compensate for it

Aging also has a dramatic effect on our skeleton

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Bone cells still hard to work , destroying old bone

and replacing it with new bone

But old day ???????? between them

osteoclasts ????? destroying bone faster than osteoblasts can build it

What remains is ??????????????

Our bones slowly crumble

And broken bones become a very real danger

it happens in both sexes

but hormonal changes of menopause

accelerate bone loss faster in women

ageing - is one of the great mysteries of life

Why these our appears change so very much

between the ages of 40 and 70 ?

It is more than wear and tear

it's a process affecting every cell in our body

Every day, cells clone themselfs in the billion

the DNA inside is also copied

as old cells die off

the new ones take that place

The trouble is

this cloning system isn't perfect

Any imprefections in DNA are also replicated

in a lifetime, we make so many copies of our cells,

that even the tiniest errors accumulate with time

It's just like using a photocopier

Copies made from copies

degrading quality

In our face

we have totally replaced the bone every 2 years

since we were born

Our 70 year old face

is 35 copy of our baby's face

The imprefections get exaggerating with each copy

so by the time we reach old age

our face looks very different indeed

Another cause of aging - is in the very air we breathe

We need oxygen to live

But throughout our life

it is slowly poisoning us

inside each of our cells

our Mitochondria are like tiny power plants

combining nutrients with oxygen

they create the energy we need

but just like the power plant

they also produce pollution

In this case the pollutant is a form of oxygen itself

the Oxygen molecules change into unstable forms called free radicals

Over a lifetime, these free radicals

slowly suffocate the mitochondria

and damage our cells

Our cells and DNA become more and more damage

and can't replicate themselfs

Our body can't repair its organs properly

eventually they fail

Death, like life, is an amazing biological process

engineering to the cells of the body

Just as our DNA

????? the timeline of our development

it also puts a cap on how long we can live

Each time a cell copies itself

??????? behind the tiny piece of DNA

After billions of divisions

so much DNA is lost

the cells eventually lose the ability to divide all together

Death is not instantaneous

It is a gradual winding down of tissues and organs

It's thought that the heart's final pump flushes the bloodstream with endorphins

the body's natural pain killer

now starved of oxygen

tissues can not function

within 10 seconds, our brain's electrical activity drops

within 4 minutes, it is damaged irreversibly

our Hearing is the last sense to die

Even after death, some cells're still alive

it can take 24 hours for skin cells to stop dividing

And the amazing 37 hours, before our last brain cell

fires its final impulse

there is a sane, the life goes on

For some of us

it could even go on for some time

Current trends suggest that children born in the West today

can expect to live into the 80 and beyond

and Even after we've gone

we live on through our left ones

Our children and our children's children carry our genes

in every one of their cells

They also carry memories of us too

the moments they have share from our extraordinary story

All journeys must oneday end

and what a journey it has be

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