The circulatory system is an organ system that distributes blood
and lymph throughout the body. Passes nutrients (such as amino
acids, electrolytes and lymph) , gases, hormones, blood cells,
etc. to and from cells in the body to help fight diseases and
help stabilize body temperature and pH to maintain homeostasis
(the body's ability to physiologically regulate its inner
environment). The heart is an organ that pumps oxygenated blood
to the body and deoxygenated blood to the lungs. In the human
heart there is one atrium or auricle and one ventricle for each
circulation, and with both a systemic and a pulmonary
circulation there are four chambers in total: left atrium, left
ventricle, right atrium and right ventricle. The right atrium is
the upper chamber of the right side of the heart. The blood that
is returned to the right atrium is deoxygenated (poor in oxygen)
and passed into the right ventricle to be pumped through the
pulmonary artery to the lungs for re-oxygenation and removal of
carbon dioxide. The le