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Hey it's me Destin.
Welcome to Smarter Every Day. So today's episode's a little bit different. I have a question
about breathing. It's pretty simple. See our bags are packed and we're about to go to the
hospital to have our third child, and my question is this. How do you go from,
this. My baby, in my baby.
To this. Now 72 hours ago, my son was inside
my wife, and now he's not. He's no longer in a liquid environment, he is in
a gaseous environment. So something has to change, and in fact it's awesome.
To learn more about this let's go talk to somebody that's smarter than me.
Well, my wife could do it but she's tired. Goodnight -Goodnight.
Alright, so to figure out how babies go from living in a liquid
environment to an air environment we had to come to smart guy's house, so
we came to a doctor's house.
Spiral staircase, you know he's smart. So, let's go check him out.
Hey how's it going? -Hey Destin.
So this is Dr Schuster, and Dr Schuster
is, a baby delivery doctor we'll call you for the video.
-Alright So, he also plays music, so that lets you know that he's
really really smart. So we're gonna get some info from him.
[music]
OK so my question
is pretty simple. How do we go from breathing fluid inside
the mother's womb, to breathing air? -As the baby's coming out,
and gets squeezed as it's coming through the birth canal. All that fluid that's been in the lungs
which is the urine from the baby and the poop from the baby, I mean all the
bad stuff. Once they get squeezed that stuff comes out and that baby takes that very
first gasp, that gasp of, oxygen.
The thing that, that baby needs. That triggers huge changes in the circulation
of baby, and that's what allows everything to start working, the baby's breathing on it's own then.
So there's actually like a switch that's flipped or something when the baby
breathes for the first time? -A couple of valves that change the circulation, change the plumbing
if you will, in the heart. Really. So where are these valves
these valves are actually in the heart? -The top half of the heart, yeah. There's something
called the foramen ovale, which is just a big flap that sits between the right and left
atrium. It closes, once that baby gets that first little bit of oxygen, that
first breath. OK so that's pretty amazing. So the first time the baby takes a
breath, and that's why that first cry is so special, becase that's actually [clicks fingers]
the moment where the baby's, autonomous. -It's all breathing. Yeah it goes from
breathing it's own poop, to breathing real oxygen, the real nutrients that it needs
for life. Oh that's awesome. Thank you very much. -Any time. Glad to do it.
Alright, we got a little man.
Let's check him out. He's alive and well and his lungs are
working and he's breathing air. One thing that happened right when he came out
is, this right here. After he started squealing a little bit, I could hear
that [clicks fingers] change when he went from fluid to, air.
The nurse brought him over here and she stuck this tube down his throat,
and she starts sucking amniotic fluid. This little
guy started telling us what he though about everything. So check him out.
Get in there, see his face.
Mmmhmm.. That's what I'm talking about. Check this out.
It's an ultrasound from 5 months ago when he was still in the womb. This is real data.
If you look close you can see all four chambers of the heart.
If you look even closer you can see that little thing that Dr Schuster was talking about.
OK I didn't understand that so I had to get my wife to put it on engineering paper
so I could figure it out. So in your heart you have four chambers, and the
blood, as it exits the lungs, it goes through the heart and comes back to your body.
And after it exits your body, it goes back through the heart and then goes back
to the lungs. We all know this, but here's the deal with
the heart before the baby comes out of the womb. You have something here called the foramen
ovale, and you have here something called the ductus arteriosus. [newborn noises in background] I hear you.
buddy, hold on. So what's going on here is, before birth
the foramen ovale and the ductus arteriosus divert blood
from the lungs, so what that means is only about 7 percent of
the blood flow goes to the lungs. [infrant crying] Daddy's here, hold on.
So, basically, before birth the lungs are really really
small. They're not inflated, because the foramen ovale and the ductus arteriosus
which is right here, diverts that blood flow. So once it flips over,
the foramen ovale closes in about an hour, and the ductus arteriosus
goes away and becomes a ligament after about 5 days. I think this is really awesome.
You can see that the blood flow goes back to 100 percent for the lungs, and the..
Alright, I'll.. [baby crying] I can get him. You're getting Smarter Every Day.
The nurses are gone, so I started messing around with
their stuff. Woah.
Check that out. Alright. Now we turn on a super light.
This is , this is
active tracking. You asleep?
-Not any more. Just bear with me. Look at this, I found a magic wand.
What? Alright so watch this.
So, there's a big light spot, and if I hold the magic wand
at the light spot, and I start blinking away, the lights will follow
the magic wand. It tracks it.
So it's
actively tracking this bulb.
[ Captions by Andrew Jackson ]
Captioning in different languages welcome. Please contact Destin if you can help.
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【每天更聰明】剛出生的寶寶是如何活下來的? (Why You Didn't Die at Birth - Smarter Every Day 42)

6263 分類 收藏
Furong Lai 發佈於 2012 年 12 月 17 日
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