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Cardiovascular System 1, Heart, Structure and Function
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Nivel MCER
Dificultad
Subtítulos (410 segmentos)
well welcome to today's video where
we're going to be considering the heart
and the heart's a hollow muscular organ
located in the thoracic
cavity and we need to learn the basic
anatomical terminology and the basic
anatomical structures in the heart
before we go further so this is kind of
an introductory session to cover that
basic anatomy now of course in anatomy
remember you're always looking at
someone else's so it's as if you're
looking at my heart so this is my left
hand here so let's write left on that
side of the board and right on this side
of the
board so we don't get mixed
up now I'll start drawing the heart
picture you can freeze frame anytime you
want and draw your
own so here we
see the main bottom Chambers in the
heart and these bottom Chambers are
called the ventricles
so we have a left ventricle on this side
and a right ventricle on the other side
and the left ventricle particularly has
a thick muscular wall so here we see the
thick muscular wall of the left
ventricle and of course the right
ventricle also has a muscular wall but
it's much
thinner now why is it that the left
ventricle has a thick muscular wall and
the right ventricle has a thin muscular
wall well as we'll see it's the left
ventricle that's pumping blood all
around the body into the systemic
circulation so the blood that's pumped
from the left ventricle goes to your
ears down to your toes up to your brain
absolutely everywhere around the body
all of the systemic
circulation so it needs to generate a
fairly High p pumping pressure with a
large muscular Mass on the left
side whereas as we'll see the right
ventricle is only pumping blood to the
lungs and if the heart is here then the
lungs are only here so there's not as
far to pump the blood so the pressure
doesn't have to be as high so the amount
of muscular Mass required is
less now the key thing about the heart
is it's in these four chambers
now first of all we need to draw some
arteries which are leaving the
heart now this valve here guards the
aort which is the large vessel which
leaves the left ventricle and the valve
there points up the
way and then between The ventricle at
the bottom and the Chamber on top
there's another valve and that one
points down the way like that so here we
see the left ventricle with one valve
there and one valve
there now the top chambers of the heart
have a much
thinner muscular
wall so the muscle becomes thinner at
that point and you can probably see here
that we're starting to draw an
additional chamber one of the top
Chambers the
Atria and draining into to the Atria
there are four large veins in humans I
think in this diagram today I'll just
draw
two so here we see
two large
veins draining blood into the top
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