Heart Introduction - How Many Mistakes
The heart is a single-pump that has two separate circuits; the systemic circuit and the cardiac
circuit. Beginning in the right atrium, which is the pumping chamber for oxygen-poor blood, the
travels through the tricuspid valve and into the left ventricle. The left ventricle is walled
flow in layer of cardiac muscle and is the receiving chamber for oxygen-rich blood. As soon
in by
as the left ventricle fills and the pressure increases the mitral valve is forced closed and the
ventricle contracts, forcing the blood through the pulmonic semilunar valve and into the
pulmonary trunk and veins. From here the blood flows to the right and left lungs where carbon
dioxide is removed from the atmosphere and oxygen is dropped off to be exhaled. The now
oxygen-rich blood travels through the aorta and back to the heart into the right atrium. From
there the blood drops through the mitral (bicuspid) valve and into the left ventricle. Once the left
ventricle fills and the pressure increases the tricuspid valve is forced closed and the ventricle
contracts, pumping blood through the pulmonic semilunar valve and into the superior and
inferior vena cavae and out to the interstitial tissues of the body where carbon dioxide is
dropped off into the tissues and oxygen is absorbed into the blood. Then the blood travels to th
aorta and back to the left atrium to start the cycle over again.
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