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10 Nov 2019
In humans,blood flows from the heart to the aorta, from which itpasses into the major arteries. These branch into the smallarteries, which in turn branch into billions of tiny capillaries.Then blood then returns to the heart via the veins. The radius ofthe aorta is about 1.2cm, and the blood passes through it with aspeed of about 40cm/s. A typical capillary has a radius of about4x10-4 cm, and the blood flows through it at a speed of 5x10-2cm/s.
(a) Estimate the number of capillaries in the body.
(b) If the body contains about 5.5 litres of blood how long does ittake for the blood to circulate completely through the body. (1litre = 10cmx10cmx10cm)
In humans,blood flows from the heart to the aorta, from which itpasses into the major arteries. These branch into the smallarteries, which in turn branch into billions of tiny capillaries.Then blood then returns to the heart via the veins. The radius ofthe aorta is about 1.2cm, and the blood passes through it with aspeed of about 40cm/s. A typical capillary has a radius of about4x10-4 cm, and the blood flows through it at a speed of 5x10-2cm/s.
(a) Estimate the number of capillaries in the body.
(b) If the body contains about 5.5 litres of blood how long does ittake for the blood to circulate completely through the body. (1litre = 10cmx10cmx10cm)
Hubert KochLv2
28 May 2019
