But One Heart
How is the human heart, a complex but single pump, can pump twice in one action?
How is the human heart, a complex but single pump, can pump twice in one action?
It is not one pump, but four actions.
(1) The first pump drives oxygenated blood out of the left ventricle,
(2)The second pumps blood from the venous pool to the low-pressure side of the pulmonary loop.
(3) The third circulates blood from the low pressure side of the pulmonary loop round the lungs, to the high-pressure side and back to the low-pressure side of the systemic loop,
(4) And the fourth pumps oxygenated blood into the low-pressure side (the left ventricle during diastole) of the systemic loop.
Then the cycle is repeated
Al Martino..I Have But One Heart