Inside the Living Body

adulthood and slowly maturity to old age

Using the latest medical imaging

and 3-D computer graphics,

we embarked

on an extraordinary voyage through the body

This is not just the story of one life

it is the story of all our lives,

told from a unique perspective

depth inside the living body

and a new life was created

A single cell has developed into a fully formed baby

We are about to be born

It is impossible to know exactly what it likes to be born

even though we've all been through it

It's certainly surprising,it's probably painful

What scientists do know

is that at the moment of birth,

we experience a surge of adrenaline

even more intense than during a heart attack

This surge of adrenaline helps us live

It kicks start our lungs into during the first breathe

Our lungs have never breathed before

they are still filled with amniotic fluid

we're in danger of drowning

On top of the kidneys, the adrenal glands

flood the blood stream with adrenaline

muscles we need to breathe, suddenly going to spasm

??????????????????

and we take our first breath

It is the most important breathe of our life

the first of 700 million

air rushes down the trachea

through thousand of branching tubes

into nearly 30 million tiny air sacs, the alveoli

these absorb oxygen into our blood

and draw out the carbon dioxide

we exhale with every breath

Now the umbilical cord,

the physical link between mother and baby, is cut

we, are on our own

a baby's organs must adapt to life outside the womb

It is a challenging and risky time

Our heart, no bigger than walnut

has already being pumping for 8 months

but in the first days of life, there is a problem with it

It has 2 holes, one in the aorta, and one in the heart.

In fact, these holes are not defects,

they are remnant of life before birth

when blood circulated through a system of blood vessels

to the placenta

the holes used to divert most of blood away from our inactive lungs

but now the lung is fully functioning,

they seal up forever

Now the heart is working normally

it pumps blood through the tens of thousands of miles of blood vessels.

our other organs're also coming online too

The liver performs over 500 very jobs,

from generating body heat to processing toxins

The kidneys function is to maintain the balance of water in the body.

Our digestive tract must clear itself out

ready to take its first meal.

our bowel is full of digested amniotic fluid

and dead cells

a sticky green black tarry material , called meconium

It is corrosive stuff

In some babies , meconium can end up in the lungs

and attack the delicate lining

though here in the gut, meconium is harmless

and is flushed out within hours

The first gulp of breast milk accelerate this process

The turmoil of birth might now be over

but the bussiness of adapting to life outside the womb

has only just begun

A newborn baby in a first months of life

This is the time when we start to make sense of world around us.

and began to explore it

infancy is a period of rapid growth

both outside and in

The human body is a miracle of microscopic design

tiny perefectly formed orgams

each made up of billions of perfectly functioning cells

These cells are the building blocks of the body

they make us what we are

inside every cell is the same extraordinary engine

a machine that tells each cell how to grow,

and what function it must perform

it s DNA, and it s unique to every person

DNA is the chemical blue print of who we are

the instructions that create each new person

and sends among the journey of life

DNA not only determines our looks and character

but also sets out the timeline of our lives

it decides when we grow , when we develop, when we age

and even when we die

But our life is also shaped by environment around us

and the people we share it with

Our life outside the womb is still a challenge

Even though our mother keeps us warm

we can't regulate our body temperature

It was 38 degrees in the womb.

Here at home, 18 degrees room temprature

is a shock to the system

The problem is,

the region of the brain we use for temprature control

the hypothalamus, is immature

Our infant brain is under pressure

it is Already making 100 trillion simultaneous calculations every second

our hypothalamus

just can't cope with additional task if keeing us warm as well

right now we're in danger of hypothermia

The infrared camera shows the struggle to keep warm.

we are losing precious body heat

The yellow area show where we lose the most

Luckily, we were born prepared

We have a special layer of tissue that keeps us warm

it s fat

normaly found in hibernating animals

Much more than just a insulating layer

this fat is packed with special cells

which actively generate heat

eventually , most of this fat melts away

as the hypothalamus matures

and takes over the job of temperature control

just days old, we know almost nothing about her world.

Everything we do , we do by instinct

even breast feeding

our mother's milk gives us all the nutrients we need

And we drink half of liter of it every day

it is much more than a ultimate super food

it also protects us from hidden dangers

Outside the womb, there are bacteria everywhere

invisible and potentially deadly

Our ??? skin is under constant attack

There are 10 times more bacteria than human cells

in and on our body

Our immune system is under develop

and we can't fight infections of our cells

amazingly our mother fights them for us

through her milk

The close contact between mother and baby

means she absorbs the same germs they're attacking us

her Mature immune system creates antibodies to kill off these bacteria

Then, in masterpiece of natural design

she passes those antibodies to her baby in breast milk.

until our own immune system develops, she will keep us safe

Breast feeding builds a deep bond between mother and child

a bond that will guide us through infancy,and into the outside world

At this age, even a simple trip to the supermarket

is a sensory overload

It's noisy , bright and smelly

High up inside the nose, the specialised olfactory nerves

???? in the stream of air we breathe

they detect chemicals and send an electrical signal to the brain

Our brain interprets these signals as smells

Our sense of smell is very sensitive

we quickly learn to recognize smells

and can identify our mother with our nose

The strange new world is also very noisy

We're bombarded with hundreds of strange new sounds

sound waves make the eardrum vibrate

On the other side of the eardrum

these tiny bones, the ossicles vibrate in sympathy

They're the smallest three bones in our body

They're so small that can fit on a fingertip

???get any bigger, they stay the size all our life

But without them we would never hear a thing

the ossicles are the air amplifiers

they amplify the volume 22 times

The amplified vibrations enter the inner ear - the cochlea

it's lined with delicate hairs

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