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This shows the pig heart from the front, with
the portion on the right of the picture being the left side of the heart
and vice versa. |
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The aorta is clearly visible at the top, with an
atrium on either side, while the ventricles are in the bottom left. |
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… is along the right ventricle. |
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The right ventricle can be identified by
squeezing the heart, since the myocardium on the right side is much less
rigid than that of the left ventricle. |
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This allows us to see the tricuspid valve and
the right ventricular outflow tract which includes the pulmonary valve. |
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The right ventricle has been cut open from the
bottom towards the top. |
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In this picture, the myocardium is being held
back. My finger is stuck underneath one leaflet of the tricuspid valve,
which leads to the pulmonary valve. |
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The tricuspid valve allows blood to flow from
the right atrium into the right ventricle. |
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When the heart is contracting, the pulmonary
valve is open because the blood pushes the cusps out of the way. |
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After contracting, the ventricles begin to relax
and the pulmonary valve closes and prevents back-flow (called regurgitation)
of blood into the ventricle. |
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This longitudinal incision extends from the
bottom to the top of the left ventricle, then continues up into the atrium
to allow us to view the entire left heart. |
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The mitral valve prevents blood from flowing
back into the left atrium |
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The mitral valve is positioned between the
atrium (at top) and ventricle (at bottom). |
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Blood flows into the ventricles by passing
through the mitral valve, but can you see where it flows out? This is a bit
of a trick question because the outflow tract is hidden behind the mitral
valves |
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Notes