my name is jay and this is icu
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all right let’s begin Lesson
in this lesson let’s take a quick look
at the flow of blood through the heart
and the heart is really the powerhouse
of the circulatory system
it’s continuously moving blood
throughout the entire body
providing oxygenated blood and nutrients
while also carrying away waste
and returning that deoxygenated blood
back to the lungs
understanding the flow of blood through
the cardiac system is vital to being
able to understand the problems and
conditions
that can come up along the way at
various points we do though need to
start off with some basic foundations
before we begin
so when i’m talking about veins i’m
talking about blood vessels that are
carrying blood
towards the heart and then arteries are
then blood vessels carrying blood away
from the heart
and then for the sake of our drawing
blue is going to be used to signify
deoxygenated blood
and red is going to be our oxygenated
blood so with that out of the way
let’s go and take a look inside the
heart so we can see some of the
structures here
there are four main chambers two upper
chambers called
atria and two lower chambers called
ventricles
and we have one of each on each side of
the heart we have the
right atrium the right ventricle the
left atrium
and the left ventricle and the atria
help to fully load the ventricle
before it then ejects blood away from
the heart the heart can also be divided
up into the right and left sides
the right side is going to be
responsible for deoxygenated blood going
right to the lungs and then the left
side is responsible for
oxygenated blood that has just left the
lungs
there’s also four heart valves that you
need to know one at the exit of each of
the four chambers
exiting from the right atrium we have
the tricuspid valve
then exiting from the right ventricle we
have the pulmonic valve
and then exiting the left atrium we have
the mitral valve
this is something that also is known as
the bicuspid valve
and then finally exiting the left
ventricle we have the aortic valve
each of these valves act as a one-way
valve to prevent
backflow of blood in the system and
normal valves have three leaflets with
the exception of the mitral valve which
only has
two hence the name bicuspid and then
finally there are the blood vessels
which
bring blood to as well as carry blood
away from the heart the inferior vena
cava which has blood originating from
the trunk
visceral organs in the lower body and
the superior vena cava which has blood
originating from the head and upper body
which these two together bring most of
the deoxygenated blood from the body
back to the heart and empty into the
right atrium
next we have the pulmonary artery which
is going to carry the deoxygenated blood
away from the heart
and then to the lungs to be oxygenated
from here we have both the right and
left
pulmonary veins which are bringing the
oxygenated blood
back to the heart and emptying into the
left atrium
and then finally the aorta carries the
oxygenated blood away from the heart to
the rest of the body
all right now that we’ve covered the
structures let’s actually see how the
blood flows through the system
we start with the deoxygenated blood
returning to the heart
via the inferior vena cava and the
superior vena cava
this blood empties into the right atrium
the right atrium then contracts the
blood through the tricuspid valve
into the right ventricle the right
ventricle then contracts
ejecting the blood through the pulmonic
valve into the pulmonary artery
now remember this is an artery because
the blood is going away from the heart
but it’s also blue here
because this is still deoxygenated blood
the pulmonary artery branches and
carries blood to the left and the right
lungs to receive
oxygen and release carbon dioxide after
the blood leaves the lungs the
oxygenated blood is going to return to
the heart via the pulmonary veins again
remember that these are veins because
they’re carrying blood
towards the heart but they’re red here
because this is now
oxygenated blood the pulmonary veins
empty the blood into the left atrium
the left atrium contracts the blood
through the mitral valve
into the left ventricle the left
ventricle then contracts
ejecting that blood through the aortic
valve into the aorta
and onto the rest of the body so one
more time let’s just talk through that
again
we start with the deoxygenated blood
returning to the heart via the inferior
vena cava and the superior vena cava
this blood empties into the right atrium
the right atrium then contracts the
blood through the tricuspid valve
into the right ventricle the right
ventricle then contracts
ejecting that blood through the pulmonic
valve into the pulmonary artery
the blood then travels to the lungs and
then returns back from the lungs via the
pulmonary veins
which then empty into the left atrium
the left atrium contracts that blood
through the mitral valve into the left
ventricle the left ventricle then
contracts
ejecting that blood through the aortic
valve to the aorta
and onto the rest of the body and
remembering the order the heart valves
can be difficult
the mnemonic tpma can help toilet
paper my asset tricuspid pulmonic
mitral aortic alright that’s all i got
Conclusion
that’s the blood flow through the heart