人体の不思議11選！

どうしてあくびが出るの？

どうして寝てるときにびくってなるの？

関節が鳴るのはなんで？

そんな疑問に英語でお答えします。

上の3つを見ただけでyawn、jerk、crackが出てきた人はなかなか語彙があります。

出てこなかった方はしっかり動画を見て聞き取りましょう！

それでは今日もYouTube英語学習を楽しんでいきましょう！

00:02 こんなこと感じたことありませんか？自分が生きている
have you ever felt like you're living in
00:05 体について何も知らない、と。
a body you literally know nothing about
00:07    ↓覚えなくてよい
woohoo Freaky Friday every once in a
00:10 時々目がぴくぴくする
while your eye starts twitching by
00:13 お腹が鯨みたいに鳴り出す
itself your stomach starts singing like
00:15                 鳥肌に覆われる
a whale or you get covered in goose
00:18 理由もなく。            さあ今こそ
bumps for no reason at all it's time for
00:20 あなたとあなたの体がお互いをもっと知るときです(英語的な言い回し、よく使うので慣れよう!)
you and your body to get to know each
00:22
other better and these 11 facts will
00:25
help you with that. one, why do your
00:29
muscles twitch for no reason it's kind
00:32
of embarrassing when you have to explain
00:34
to someone why you're constantly winking
00:36
at them if your eye starts to twitch
00:39
occasionally it's a signal that you're
00:41 ストレスに対処or良質な睡眠ができていない
dealing with stress or having a hard
00:43                                        /そうでなければ
time trying to get a good sleep if not
00:45 おそらくコーヒーの飲み過ぎか
then you probably drank too much coffee
00:48 甘すぎるものを食べたか
or ate something extremely sweet
00:50
recently the twitch itself is harmless
00:52 原因は、筋肉疲労や過剰な刺激が脳から送られていること
it's caused by muscle fatigue and over
00:55
stimulation from your brain. 2, why do
01:00 なぜ寒い時に震えだすのか
we shake when it's cold we're all
01:02            どうしても歯がカチカチなったり
familiar with uncontrollable chattering
01:05 脚が震えたりしますよね
teeth and shivering legs when we're cold.
01:07
this happens because all your muscles
01:09
are slightly yet rapidly moving to
01:12 熱を摩擦から生み出すために
generate some heat from friction rub
01:14 手をこする
your hands together on a cold day and
01:16
they'll become warmer this is the same
01:18
thing but on a smaller scale your brain
01:21
works like a conductor it conducts the
01:24
temperature of your skin if it's warmer
01:26
than 98.6 degrees Fahrenheit it'll send
01:29
a signal for it to start sweating if
01:31
it's colder than that it'll send a
01:33
signal for your muscles to start
01:35
shivering 3 why does your leg fall
01:40               机から立ち上がって
asleep it's scary to stand up from your
01:43 片足の感覚が何故かなくなっていると怖いですよね
desk and have the sensation that one of
01:45
your legs is useless now for some reason
01:47 焦らないでください、皆さん知っての通り、足の感覚は
well don't panic we all know that it'll
01:50 すぐに戻ってきます、それまでは
wake up in a while even though the
01:52 脚が動かせなかったり感覚が無くて気持ち悪いですが。
process will include a complete lack of
01:54
control and a few minutes of unnerving
01:57                   これが起こる理由は
uncomfort this happened because you were
01:59 座る体勢が変だからです。座り方によって
sitting in an odd position the way you
02:01 血流が制限され
sat restricted the amount of blood that
02:04                      たった10分
could get your leg. only 10 minutes
02:06 適切な血流が阻まれると
without proper blood circulation will
02:08 この痺れを引き起こします。
cause this numbness. And the
02:10 この不快な感覚は             s/v/c
uncomfortable feeling afterwards is the
02:13 血液が流れだしている感覚です
sation of blood rushing back in to every
02:16                   触ると痛いよね
bit of your leg yep pins and needles. 
02:20
4, why are your eyes wet when you wake up
02:24
sometimes it's not only that but you
02:26
might also wake up with a crusty mess in
02:29
the corners of your eyes it all happens
02:31
for the same reason you see when we
02:34
sleep we don't always keep our eyes
02:36
tightly shut to compensate for the lack
02:38
of protection and wash away all the dust
02:41
that might settle on your eye during the
02:43
night special glands in the corners of
02:46
our eyes produce tears and when you feel
02:49
tired and are getting ready to go to
02:50
sleep your eyes water from all the
02:53
yawning yawning applies pressure to the
02:56
lacrimal glands and at the same time
02:58
blocks tears from their regular path to
03:00
our eyes that's why they overflow as
03:03
soon as you stop yawning five
03:07
what about yawning when you don't want
03:09
to sleep at all basically yawning isn't
03:12
only supposed to happen when you're
03:14
sleepy or bored it's just the most
03:16
common circumstances for it fun fact
03:19
parachutists often yawn right before
03:21
they get ready to jump from the plane
03:23
now I wouldn't call that a good moment
03:25
to take a nap nor would I say that
03:27
skydiving is the most boring thing ever
03:30
haha try it sometime yawning is
03:33
basically stretching your jaw and
03:35
inhaling as deep as you can both actions
03:38
make the blood in your vessels rush to
03:41
your head and spinal fluid go down your
03:43
spine surprisingly it's a way for your
03:46
body to shake you up whenever you feel
03:48
stressed or anxious
03:49
you might yawn as your body prepares
03:52
itself to deal with it
03:53
yawning also has psychological reasons
03:56
you've probably noticed that it can be
03:58
contagious that's because we're a highly
04:01
social species and as such we need to
04:04
synchronize our cycles of sleep with
04:06
each other
04:06
in short when one person starts beyond
04:09
from fatigue he or she sends a signal of
04:12
fatigue to others around and makes
04:14
everyone sleepy
04:16
well it turns out yawning is magic
04:19
six what are either x' have you ever
04:23
seen those strange ghostly looking flies
04:26
that seem to float aimlessly right in
04:28
front of your eyes or maybe even inside
04:31
your eyes
04:32
well don't be afraid these aren't flies
04:34
at all their eye floaters they're
04:37
especially easy to see if you look at
04:38
the blue sky or other light and clear
04:41
scenes floaters aren't exactly objects
04:44
they're just tiny imperfections in one
04:46
special part of the main body of the eye
04:48
called the vitreous we see them because
04:52
these structural imperfections stand in
04:54
the way of the light that passes from
04:56
pupil to retina which forms your vision
04:58
so you don't have to rush to an
05:00
optometrist the next time you see them
05:02
they're usually perfectly harmless seven
05:06
white is falling asleep sometimes feel
05:10
like literally falling the worst kind of
05:12
waking up is when you jerk or jump
05:15
startled with a terrible sensation that
05:17
you fell off your bed or a cliff it
05:20
turns out this happens right after you
05:22
fallen asleep at the exact moment all
05:25
your muscles simultaneously relax your
05:28
brain may mistake it as a distress call
05:30
because normally if all your muscles
05:33
relaxed you'd fall to prepare you for
05:36
the fall your brain will naturally send
05:38
a lot of quick signals to your muscles
05:40
to make them work again this phenomenon
05:42
even has a special name hypnic jerks the
05:46
same thing also happens on a smaller
05:48
scale making your legs or arms twitch
05:51
when you're falling asleep number eight
05:54
what your legs feel lead heavy when
05:57
you're afraid when startled or just
06:00
scared your legs might become as heavy
06:02
as tree trunks your heart will be
06:05
pumping and your skin will get covered
06:07
in goose bumps these are all result of
06:09
the same process a reaction to
06:12
adrenaline coming into your blood flow
06:14
when adrenaline kicks in it triggers
06:17
what's called the fight-or-flight
06:18
reaction this reaction causes increased
06:21
muscle tension and blood flow making
06:23
your legs feel heavy all your body
06:26
systems become highly alert getting
06:28
ready to act hard and
06:30
act fast but at the same time this
06:33
reaction could go two different ways you
06:35
might run like an Olympic athlete or you
06:38
might not be able to move a single
06:40
muscle the reason is that there are two
06:42
kinds of reactions to a dangerous
06:44
situation you can deal with it by
06:46
overcoming it or you can avoid it
06:49
completely 9 why do your fingers get all
06:54
wrinkly from water because it's easier
06:56
to pick fruits from trees in rainy
06:58
weather with hands like that
07:00
no seriously let me explain the
07:03
wrinkling itself happens when small
07:05
blood vessels constrict under the skin
07:07
but that's not the most interesting part
07:10
mm-hmm scientists discovered that if the
07:13
nerves in your fingers are damaged the
07:15
wrinkles won't appear at all no matter
07:17
how long they've been under water that
07:19
means that wrinkling happens because of
07:21
a specific reaction of our body to water
07:24
it's not just a quality of the skin
07:26
itself so it must be important for some
07:29
biological reason further tests have
07:32
involved trying to collect wet glass
07:34
marbles with dry hands and with wrinkly
07:36
wet hands and they've proved that it's
07:39
much easier to collect those marbles
07:40
with wet hands the same goes for feet
07:43
too it's much easier and safer to stand
07:46
on a wet surface with your feet covered
07:48
in wrinkles I guess it's Nature's Way of
07:50
improving our grip in a slippery
07:52
situation number 10
07:56
why do joints pop even if you don't
07:59
always notice that horrifying sound
08:01
because of your own bad habit to crack
08:03
joints you'd recognize it anywhere to be
08:06
fair it's even worse when you just stand
08:08
up from your desk and hear a click as if
08:11
you've somehow hurt yourself or broken
08:13
something that's not the case at all
08:15
it's been proven that cracking joints
08:17
doesn't even affect our wellness that
08:19
much the clicking and cracking sounds
08:22
happen when a serious force pushes on a
08:24
joint bending it in a way that causes a
08:27
small bubble of gas to escape and
08:29
deflate sort of like a joint fart this
08:33
bubble appears naturally in every joint
08:35
of your body and doesn't pose any threat
08:37
just like joint cracking itself do you
08:41
have a bad habit of cracking your joints
08:43
or are you one of those that can't stand
08:45
the sound let me know down in the
08:48
comments eleven what makes your stomach
08:52
growl belly bubbles gut Rumble a rumbly
08:56
in your tumbling coal whatever we all
08:59
know this embarrassing sound too well
09:01
what's not as well known is what causes
09:03
it
09:04
in basic terms your brain is mocking you
09:07
for not eating I know it sounds strange
09:09
but how else would you explain this when
09:12
your stomach is empty your brain sends a
09:15
signal to start the process of digesting
09:17
something and transporting it further
09:19
down the digestive system but there's
09:22
nothing to move except gas which is what
09:25
makes all the noise so just put
09:27
something down there will ya hey if you
09:31
learn something new today then give the
09:32
video a like and share it with a friend
09:34
and here are some other videos I think
09:36
you'll enjoy just click to the left or
09:39
the right and remember stay on the
09:41
bright side of life