Why does the Heart beat? Video Lecture | Science Class 7

hi guys do you want to try something
neat take these two fingers now hold
them on the side of your neck right next
to your throat if you hold themself for
just a moment you'll start to feel
something bumping around in there that
is your pulse the feeling of blood
moving through your body and that means
you're actually feeling your heart
beating your heart is always beating all
day and all night even when you're
asleep it can never take a break because
it has a very important job it moves
your blood all around your body and your
heart can do that because it's actually
a muscle you have muscles all over your
body that help you move like muscles in
your legs that you can use to run and
muscles in your jaw for chewing yummy
food but your heart is the hardest
working muscle of them all now make a
fist with your hand that's about how big
your heart is it may seem kind of small
but it's incredibly strong and it's the
constant squeezing of your heart muscle
that keeps all that blood flowing but
why does your blood have to move around
in the first place well you can think of
your blood as working kind of like a
delivery truck
it carries lots of what your body needs
in order to keep going
especially oxygen you've probably heard
of it before oxygen is a gas in the air
that people and a lot of other animals
need to live when you breathe in you're
bringing oxygen into your lungs and your
blood is there to soak up all that
oxygen and with the help of your heart
send it all over your body to your head
into your feet and everywhere in between
as your blood gets pumped around all of
the different parts of your body take
the oxygen from it and they use it to do
their jobs whether that's making your
leg muscles move so you can run or
helping your stomach take care of that
sandwich you had for lunch but your body
also has a bunch of stuff that it needs
to get rid of especially a gas called
carbon dioxide so after your blood drops
off this shipment of oxygen it also
picks up that waste and hauls it off
when your blood gets back to your heart
it gets pushed to the lungs once again
where the blood drops off the car
outside and picks up more oxygen so when
you breathe in your breathing an oxygen
that goes into your blood and when you
breathe out your breathing out the
carbon dioxide that your body has gotten
rid of now it sounds like a long journey
but your heart can pump blood to every
part of your body in less than one
minute and your heart beats at least
100,000 times every day so at any point
during your day your heart is sending
blood to your lungs and out to the rest
of your body and back to your lungs
again all at one that's some serious
work but have you ever noticed your
heart beating faster when you've been
running around for a while that's your
heart working extra hard when you're
riding jumping and playing around your
body needs more oxygen and other
nutrients to do that extra work so your
heart has to work harder to send all of
those good things or the parts of your
body that need them and to get rid of
all the extra waste so the more you
exercise your body the more you exercise
your heart now who's up for some jumping
jacks to get our hearts beating faster
and if there's something that you'd like
to learn more about just let us know by
asking an adult to help you leave a
comment below or email us at kids at the
scishow comm and we'll see you next time
you