The heart has 4 chambers the right and left atria and right and left ventricles. the atria pump blood into the ventricles. The arteries from the right side is the pulmonary artery which goes to the lungs then into the left atria then left ventricle followed by the aorta rest of the body into the vena cava lastly into the right atria and then right ventricle.
Flow
diagram
From the
rest of
the body
by vena
cava
right
atria
right
ventricle
pulmonary
artery
lungs
pulmonary
vein
left
atria
left
ventricle
aorta
rest of the
body
The heart has 4 chambers the right
and left atria and right and left
ventricles. the atria pump blood
into the ventricles. The arteries
from the right side is the pulmonary
artery which goes to the lungs then
into the left atria then left ventricle
followed by the aorta rest of the
body into the vena cava lastly into
the right atria and then right
ventricle.
how it works
The left side of the
heart has to pump
blood much
further so its wall
is much thicker.
electrical
signals
The AV Node starts the pulse by sending an
electrical signal around the atria which cause them
to contract.
This then reaches
the SA node whcih
stops the contraction
for a very brief
amount of time to
allow the contraction
phase of the atria to
finish. It then passes
it on.
The Bundle of HIS is next where
it is taken down the middle of
the septum.
The Purkinje fibres
follow taking it to the
bottom of the
ventricles causing them
to contract.
To note the signal does not go through the
wall between the AV node and ventricles
because that would mean it contracts
downwards. This would mean that the way
to the aorta is shut off as they are at the
top of the heart.