Page 66 - Miracles in Our Bodies

O Original Pumps
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O Original Pumps
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The heart, which
tissue cells
CO 2 O 2 is a muscular organ of
about the size of one's
pulmonary
artery fist, consists of two
CO 2 right CO 2 halves. There are two
atrium pumps in these sec-
tions. The left pump,
O 2 left O 2
atrium
lung lung which is stronger, dri-
pulmonary
vein ves oxygen-rich blood
right ventricle left ventricle
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t the brain to the body. The right pump
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tion capillaries
former and pumps
oxygen-poor blood to the lungs. This transport from the heart to
the lungs is over a short distance and is, therefore, called the
"small circulation". The former is called the "large circulation".
Each of these halves of the heart is divided into two further
sections. Blood between them passes to the other section through
heart valves. These pumps operate unceasingly with a great
amount of energy, thanks to which blood circulates through our
bodies 1,000 times a day.
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