NUMBER OF CAPILLARIES. In humans, blood flows from the heart into the aorta, from which it passes into the major arteries. These branch into small arteries (arterioles), which in turn branch into myriad capillaries (see the accompanying Figure). The blood returns to the heart via the veins. The radius of the aorta is about 1.2 cm, and the blood passing through it has a speed of about 40 cm/s. À typical capillary has a radius of 4x10-4 cm, and the blood flows through it at the speed of about 5 x 104 m/s. Estimate the number of

Human Anatomy & Physiology (11th Edition)
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Chapter1: The Human Body: An Orientation
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NUMBER OF CAPILLARIES. In humans, blood
flows from the heart into the aorta, from which it
passes into the major arteries. These branch into
small arteries (arterioles), which in turn branch
into myriad capillaries (see the accompanying
Figure). The blood returns to the heart via the
veins. The radius of the aorta is about 1.2 cm, and
the blood passing through it has a speed of about
40 cm/s. À typical capillary has a radius of 4x104
cm, and the blood flows through it at the speed of
about 5 x 104 m/s. Estimate the number of
capillaries that are in the human body.
Head
Arms
Lungs
Aorta
Heart
Body organs
Trunk
Kidneys
Legs
V = valves
c = capillaries
Arteries
Veins
Transcribed Image Text:NUMBER OF CAPILLARIES. In humans, blood flows from the heart into the aorta, from which it passes into the major arteries. These branch into small arteries (arterioles), which in turn branch into myriad capillaries (see the accompanying Figure). The blood returns to the heart via the veins. The radius of the aorta is about 1.2 cm, and the blood passing through it has a speed of about 40 cm/s. À typical capillary has a radius of 4x104 cm, and the blood flows through it at the speed of about 5 x 104 m/s. Estimate the number of capillaries that are in the human body. Head Arms Lungs Aorta Heart Body organs Trunk Kidneys Legs V = valves c = capillaries Arteries Veins
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