Ah.
Now ladies things may seem unrelated but just keep your eye on the screen.
We'll come to the heart of the matter later on
today
when Packer making a living by digging up the insects on the bark of a tree.
And a penguin going for a calling.
In a queer face and something.
Always home.
This is the famous Archer of Seychelles the Malay ocean ducks OK Jackie a lot all.
And these are fish eggs that we are going to put under the microscope
and while we're putting them on I'd like Mind you that the dogs.
The men they would pack are the Penguin
and the fish had one thing in common they had a beating heart and.
The blood circulation system.
Now we're going to put these fish eggs under the microscope
and magnify them very much
and see what we can see.
And that's the various sign of life
that we see in a hatching fish a it's the beating heart of the future phage.
Now the fish has a very simple kind of hard compared to that in the human frame.
In fact it's something like a piece of rubber tubing that expands
and contracts an expander and over again it's a pump.
Now it's side because the weight is in the face it looks like a bald tie there.
And as it expands
and contracts it forces the blood forward to the gills where it picks up oxygen the
circulating system carries
that oxygen to wherever it is needed in the fish which means all over the face then
back to the heart again to get more oxygen
when it is pumped once again through the gills of the fish.
That's a single chain circulation system within a lead valves
and out lead valves in the pumping heart.
Now
when we come to the reptiles which is a slightly higher form of life we find
that the Sofia lading system has become a little bit more complicated.
That is there are two loops in the circulating system in one of blood is pumped
from the heart around the lungs where it picks up the oxygen
and that's where you see
that light fluid from the left back to the heart again to get what you my colleague
in another booster shot. To pump it around the rest of the animal.
Now there you see
that in this hide the blood without oxygen on its way to the lungs
and the blood with our kitchen being pumped around.
The reptile are mixed at one point. But in the higher forms of life.
There is a wall of tissue that grows down like that
and separates one half of the heart completely from the other half and in.
That's the same height that we have in the higher mammals and in the human beings.
Now this is a diagram of this system of circulation of the blood.
In the human beings you see covered was filled with oxygen I mean it goes out to
our extremities to our hands and to our feet into our heads
and to our skin all over
and as we saw the oxygen the blood flows back again through the veins to the lungs
that it is pumped from the right side of the heart into the lungs
and here's the double system an operation
that goes out around our externalities back to the heart from the heart around the
lungs to pick up oxygen
and from the heart again out around the fringe of the system so to speak.
This is the human heart. Actually in operation here.
It beats about the hundred thousand times a day in which operation it pumps about
ten thousand cords of blood through the human system does
that twenty thousand pounds edge ten tons so you can see
that in a couple of days the height actually pushes another weight around to fill a
huge freight car.
Now this is another closeup of the same system an operation
that doubles circulation out around the human frame back to the heart then around
the lungs back to the heart and out around again through the arterial system.
The vein system being the return trip to the right side of the heart.
Now in the normal human being. There is an average pulse B.
Which is the beat of the heart.
But if we take on hard yards then we increase the pulsation of the heart
The beat four minutes
and it all depends on how much strain we put on the heart as to how fast it will be
for us because it has a limit in beating fast
and it also has a low limit beyond which it would cease to be to tall in which case
that would be the end of the individual Now there are some diseases
that can speed up the beating of the heart very much.
And there are other diseases that slow down the pulse of the building of the heart.
The danger there of course is
that it will slow down to the stopping point
that we should avoid is putting and deal and sudden strain on the heart
and here is a man I was trying to catch a train.
He says overweight a lot is running up stairs carrying two heavy bags
that badly put a very heavy strain on his heart
and of course it is not only a physical strain that may be dangerous.
There may be also a mental strain or an emotional strain.
And if the strain becomes too great.
Then that person becomes a victim of heart disease.
This is an X. Ray picture of the human to ourselves.
But we can do better than
that with patients these days we can put the patient between a sort of X.
Rays and a flora scope and we can actually see the human heart beating.
And we can learn a great deal about it.
We can see whether it's under size or over size
or whether it's swollen on one side or nah.
Doctors can tell a good deal by watching the heart in operation.
Another way of checking on a heart is by what is known as an electrocardiogram.
You know each time the heart beats it sends out an electric impulse
and the electrocardiogram has a delicate instrument for registering these impulses
and putting them on a strip of film.
Now here is an electrocardiogram record of the beating of a patient's heart
and it looks to me like a very good heart
that a healthy patient with a normal heartbeat
but this one below is a very flattering heart
and the patient would be a very poor insurance risk because if we want to see how
the hype.
Increases its pace under the call made for greater energy we ask the
patient to go through some exercises like this
and we watch how the heart responds to the demand for an increase in its pace
because the heart is a muscle in fact it's a great deal more than
that it's a whole series of intricate criss cross muscles and we know
that by proper treatment and by training.
We can develop our muscles so that we can do things
that otherwise we couldn't do with them we can put them under strains
and stresses that. They very damaging.
If we had not developed them by training course all the training of athletes has
pointed towards that end.
And notice that before athletes don't put themselves in
that tremendous transportation they always warm up.
So that's the point we must do these things gradually
and not put the heart to a strain to which it is unaccustomed So remember this
that the human heart is on has run in some cases for as long as one hundred years
when for rest or repairs but not every ride is perfect
and even the strongest heart can be damaged wrecked by young douche train.
So take care. The one you have. And your life goes with a good heart and a kind.