4916321
Description
Mind Map by Thomas Marshall, updated more than 1 year ago
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1_The
Heart
- 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
- rest of
the body
- aorta
- left
ventricle
- left
atria
- pulmonary
vein
- lungs
- pulmonary
artery
- right
ventricle
- right
atria
- 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.
- From the rest
of the body
by vena cava
- how it
works
- The left side of the
heart has to pump
blood much further
so its wall is much
thicker.
- The electrical signal is designed so that the
muscle of the heart will pass on through the
wall until it reaches the point of the wall
between the atria and ventricles. Here there
is a layer of non-conductive tissue designed
to ensure that the atria and ventricles don't
contract at the same time. If this was here
the electrical signal would pass through the
whole heart and the heart would be useless.
- The electrical signal also has to travel
to the bottom of the heart to enable
the heart to contract from the
bottom up. This means that the
ventricles push the blood out
throught the arteries which are at
the top meaning that the ventricles
dont chut the only exit for the blood.
- The electrical signal also has to travel
to the bottom of the heart to enable
the heart to contract from the
bottom up. This means that the
ventricles push the blood out
throught the arteries which are at
the top meaning that the ventricles
dont chut the only exit for the blood.
- 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.
- 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.
- The Purkinje fibres
follow taking it to
the bottom of the
ventricles causing
them to contract.
- The Bundle of
HIS is next
where it is
taken down
the middle of
the septum.
- 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 AV Node starts
the pulse by
sending an
electrical signal
around the atria
which cause them
to contract.
- The Cardiac control centre (CCC)
- 3 different types of receptors to change the heart rate.
- 3 different types of receptors to change the heart rate.
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