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Ah.

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Now ladies things may seem unrelated
but just keep your eye on the screen.

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We'll come to the heart
of the matter later on

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today

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when Packer making a living by digging
up the insects on the bark of a tree.

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And a penguin going for a calling.

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In a queer face and something.

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Always home.

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This is the famous Archer of Seychelles the
Malay ocean ducks OK Jackie a lot all.

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And these are fish eggs that we are
going to put under the microscope

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and while we're putting them on
I'd like Mind you that the dogs.

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The men they would pack are the Penguin

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and the fish had one thing in common
they had a beating heart and.

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The blood circulation system.

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Now we're going to put these
fish eggs under the microscope

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and magnify them very much

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and see what we can see.

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And that's the various sign of life

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that we see in a hatching fish a it's
the beating heart of the future phage.

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Now the fish has a very simple kind of
hard compared to that in the human frame.

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In fact it's something like a piece
of rubber tubing that expands

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and contracts an expander
and over again it's a pump.

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Now it's side because the weight is in
the face it looks like a bald tie there.

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And as it expands

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and contracts it forces the blood forward
to the gills where it picks up oxygen the

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circulating system carries

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that oxygen to wherever it is needed in the
fish which means all over the face then

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back to the heart again to get more oxygen

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when it is pumped once again
through the gills of the fish.

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That's a single chain circulation
system within a lead valves

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and out lead valves in the pumping heart.

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Now

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when we come to the reptiles which is a
slightly higher form of life we find

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that the Sofia lading system has
become a little bit more complicated.

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That is there are two loops in the
circulating system in one of blood is pumped

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from the heart around the lungs
where it picks up the oxygen

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and that's where you see

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that light fluid from the left back to the
heart again to get what you my colleague

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in another booster shot. To pump
it around the rest of the animal.

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Now there you see

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that in this hide the blood without
oxygen on its way to the lungs

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and the blood with our
kitchen being pumped around.

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The reptile are mixed at one point.
But in the higher forms of life.

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There is a wall of tissue
that grows down like that

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and separates one half of the heart
completely from the other half and in.

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That's the same height that we have in the
higher mammals and in the human beings.

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Now this is a diagram of this
system of circulation of the blood.

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In the human beings you see covered was
filled with oxygen I mean it goes out to

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our extremities to our hands
and to our feet into our heads

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and to our skin all over

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and as we saw the oxygen the blood flows
back again through the veins to the lungs

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that it is pumped from the right
side of the heart into the lungs

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and here's the double system an operation

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that goes out around our externalities back
to the heart from the heart around the

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lungs to pick up oxygen

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and from the heart again out around
the fringe of the system so to speak.

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This is the human heart.
Actually in operation here.

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It beats about the hundred thousand times
a day in which operation it pumps about

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ten thousand cords of blood
through the human system does

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that twenty thousand pounds
edge ten tons so you can see

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that in a couple of days the height actually
pushes another weight around to fill a

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huge freight car.

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Now this is another closeup of
the same system an operation

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that doubles circulation out around the
human frame back to the heart then around

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the lungs back to the heart and out
around again through the arterial system.

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The vein system being the return
trip to the right side of the heart.

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Now in the normal human being.
There is an average pulse B.

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Which is the beat of the heart.

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But if we take on hard yards then we
increase the pulsation of the heart

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The beat four minutes

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and it all depends on how much strain we
put on the heart as to how fast it will be

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for us because it has a
limit in beating fast

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and it also has a low limit beyond which
it would cease to be to tall in which case

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that would be the end of the
individual Now there are some diseases

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that can speed up the beating
of the heart very much.

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And there are other diseases that slow down
the pulse of the building of the heart.

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The danger there of course is

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that it will slow down
to the stopping point

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that we should avoid is putting and
deal and sudden strain on the heart

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and here is a man I was
trying to catch a train.

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He says overweight a lot is running
up stairs carrying two heavy bags

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that badly put a very
heavy strain on his heart

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and of course it is not only a
physical strain that may be dangerous.

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There may be also a mental
strain or an emotional strain.

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And if the strain becomes too great.

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Then that person becomes a
victim of heart disease.

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This is an X. Ray picture
of the human to ourselves.

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But we can do better than

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that with patients these days we can
put the patient between a sort of X.

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Rays and a flora scope and we can
actually see the human heart beating.

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And we can learn a great deal about it.

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We can see whether it's
under size or over size

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or whether it's swollen
on one side or nah.

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Doctors can tell a good deal by
watching the heart in operation.

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Another way of checking on a heart is by
what is known as an electrocardiogram.

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You know each time the heart beats
it sends out an electric impulse

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and the electrocardiogram has a delicate
instrument for registering these impulses

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and putting them on a strip of film.

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Now here is an electrocardiogram record
of the beating of a patient's heart

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and it looks to me like a very good heart

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that a healthy patient
with a normal heartbeat

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but this one below is a
very flattering heart

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and the patient would be a very poor
insurance risk because if we want to see how

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the hype.

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Increases its pace under the call
made for greater energy we ask the

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patient to go through
some exercises like this

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and we watch how the heart responds to
the demand for an increase in its pace

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because the heart is a muscle in
fact it's a great deal more than

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that it's a whole series of intricate
criss cross muscles and we know

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that by proper treatment and by training.

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We can develop our muscles
so that we can do things

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that otherwise we couldn't do with
them we can put them under strains

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and stresses that. They very damaging.

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If we had not developed them by training
course all the training of athletes has

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pointed towards that end.

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And notice that before athletes
don't put themselves in

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that tremendous transportation
they always warm up.

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So that's the point we must
do these things gradually

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and not put the heart to a strain to which
it is unaccustomed So remember this

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that the human heart is on has run in some
cases for as long as one hundred years

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when for rest or repairs but
not every ride is perfect

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and even the strongest heart can be
damaged wrecked by young douche train.

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So take care. The one you have. And your
life goes with a good heart and a kind.