.Sci Am vol 254(6) 1986 pg 84-96 in https://www.jstor.org/stable/24975976?seq=1#page_scan_tab_contents
https://www.khanacademy.org/science/health-and-medicine/circulatory-system/circulatory -system-introduction/a/the-heart-is-a-double-pump
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"The heart’s four chambers function as a double-sided pump, with an upper and continuous lower chamber on each side of the heart." https://www.healthline.com/health/heart-disease/how-heart-works "This pump is most unusual in that the source of energy for the pump is located in the walls of the pump itself. It also has an unusual circulatory system, a system which must function in an organ which shrinks and dilates many times a day as it pumps blood." From: Burch G.E. (1983) The Human Heart as a Pump. In: Dintenfass L., Julian D.G., Seaman G.V.F. (eds) Heart Perfusion, Energetics, and Ischemia. NATO Advanced Science Institutes Series (Series A: Life Sciences), vol 62. Springer, Boston, MA "A new model suggest some energy from each contraction is stored within the muscle and provides power for a suction that aids in filling." .Sci Am vol 254(6) 1986 pg 84-96 in https://www.jstor.org/stable/24975976?seq=1#page_scan_tab_contents "Even if the right ventricle squeezes down and raises the pressure of the blood to about 25 mmHg, after passing through the lungs, the blood pressure is back down to about 5mm Hg (a reduction of 20 mmHg). It goes into the left ventricle where it gets a second squeeze causing the pressure to rise back up to about 120 mmHg (almost 5 times the pulmonary pressure!). That’s enough pressure to make it through all of the organs in the body. https://www.khanacademy.org/science/health-and-medicine/circulatory-system/circulatory -system-introduction/a/the-heart-is-a-double-pump There is no room for haphazard evolution here-comparative studies with other organisms' hearts only reveals the complexity of each form of life. TO GOD BE THE GLORY
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