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動画の字幕をクリックしてすぐ単語の意味を調べられます!
単語帳読み込み中…
字幕の修正報告
It's AumSum Time.
The human heart.
Just look at this machine.
You remember him, right?
Yes.
It is Wall-E, the iconic robot who meets Eva
and falls in love with her.

Have you ever been in love AumSum?
Yes.
I can see her now.
Two soft buns, cheese, tomato.
My Burger.
Anyways, which organ is associated with love?
The heart, right?
It is kind of obvious.
But the truth is our heart does not teach
us to love.

And most important, it does not break apart
when somebody leaves us.

Yeah.
It is true.
Our heart, the cone shaped organ is actually
a complete workaholic.

Throughout our life time.
It tirelessly pumps oxygen and nutrient rich
blood to all our body parts.

Just like a pumping machine.
Come on now.
Close your palm and form a fist.
Do not worry.
I am not asking you to fight.
Our fist is approximately how big our heart
is.

It is located between our lungs, slightly
tilted towards the left side.

It is enclosed in a double layered sac called
pericardium.

Does it taste like Peri Peri Fries?
No AumSum.
What does a picture frame do?
It holds the picture in place, right?
Without the frame, the picture would fall
off.

Just like that, the pericardium protects the
heart.

By anchoring it to the surrounding tissue
so that heart stays in place.

Pericardium also prevents the heart from overfilling.
Now, just like Captain America's shield is
made of special alloy.

Our heart is made of special muscle cells
called cardiac muscle fibers.

Now, let us dive in.
Just like a tennis net divides the tennis
court into 2 parts.

The heart is also divided onto the left and
the right side.

By a wall called cardiac septum.
The right side of the heart is filled with
deoxygenated blood.

While, the left side is filled with oxygenated
blood.

And this dividing wall prevents the blood
from mixing.

Each side of heart further divides into two
chambers.

The upper chambers are called atria.
While, the lower chambers are called ventricles.
Where are the sleeping chambers?
Stop it AumSum.
Let us first learn about atrium.
Now, just like a postbox receives letters
from multiple people.

The atrium receives blood from different parts
of the body.

Thus, the atria are simply receiving chambers.
They have thin muscular walls.
Why Thin?
Do they believe in size 0?
No AumSum.
Their walls are thin, not requiring a lot
of muscle tissue.

Because they have to pump blood into ventricles
present below them.

Now, moving onto the ventricle.
Just like the postman collects all the letters
from the postbox.

And delivers them to their respective locations.
Ventricle also collects blood from the atrium.
And pumps it to different parts of the body.
Thus, the ventricles are called discharging
chambers.

Just like coconuts have thick outer covering.
Ventricles have thick muscular walls.
Why Thick?
Because the walls need more muscle tissue.
To generate enough pressure, so as to pump
blood out of the heart.

And distribute it to the entire body.
Now, left ventricle's wall is even more thicker
than right ventricle's wall.

Because the right ventricle pumps blood only
to the lungs.

While left ventricle has to pump to entire
body, requiring more pressure than right ventricle.

Now, let us talk about the valves of the heart.
In total, we have 4 valves.
Tricuspid valve, bicuspid valve, pulmonary
valve and aortic valve.

What happens when you hop onto a flight?
Can you just change your mind and ask the
pilot to turn back?

No.
Same with the 4 valves of the heart.
They are fibrous flaps of tissue allowing
the blood to flow in one direction only.

And then they close tightly, preventing the
backflow of blood.

So, they basically act like security guards.
The tricuspid valve guards the opening between
right atrium and right ventricle.

While the bicuspid valve guards the opening
between left atrium and left ventricle.

Together, they are called atrioventricular
valves.

Pulmonary valve guards opening between right
ventricle and pulmonary artery.

While, aortic valve guards opening between
left ventricle and aorta.

Together, they are called semilunar valves.
Atrioventricular, Semilunar.
Sounds like the names of some star trek guys.
AumSum.
So, that was all for the structure of the
heart.

Now, let us understand its working.
But before that, let me ask you something.
Why is the heart so important?
Can't we survive without it?
Depends.
Can you survive without oxygen?
No right?
Who is the guy making sure that every cell
of our body gets oxygen?

The heart.
It pumps blood through the entire body, supplying
oxygen and nutrients to cells.

And removing carbon dioxide and waste materials
from them.

This movement of blood through the entire
body is called circulation of blood.

Let us understand this movement.
From different body parts, deoxygenated blood
is collected and brought to the heart.

It enters right atrium through blood vessels
called superior and inferior vena cava.

This deoxygenated blood now moves into the
right ventricle.

Now, in order to purify blood, it is sent
to the lungs via the pulmonary artery.

In the lungs, the blood is purified, that
is, carbon dioxide is removed.

And oxygen is added to the blood.
Now, this oxygenated blood needs to be sent
to all body parts.

So, let us take it back to heart, through
the pulmonary veins into the left atrium.

From there, it flows into the left ventricle.
And now finally, through aorta, it leaves
the heart and is sent throughout the body.

Thus, oxygenated blood is delivered to every
cell.

This completes one cycle of blood circulation.
Now, deoxygenated blood is again collected,
brought back to the heart.

And the cycle continues.
Did you know that.
The blood circulation between the heart and
lungs is called pulmonary circulation.

While, the circulation between the heart and
body parts is called systemic circulation.

Since blood flows twice through the heart
in one circuit, it is called double circulation.

Well I am double awesome.
Because awesome flows constantly through me
every second.

You are unbelievable AumSum.
コツ:単語をクリックしてすぐ意味を調べられます!

読み込み中…

The Human Heart | #aumsum

70 タグ追加 保存
AumSum 2019 年 5 月 25 日 に公開
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