Q:

Blood may flow in the aorta with a speed of 30 cm/s and in the capillaries with a speed of only 0.1 m/s. Why is there such a large difference in speed?

waelhammad
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2022-10-18
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Blood may flow in the aorta with a speed of 30 cm/s and in the capillaries with a speed of only 0.1 m/s. Why is there such a large difference in speed?

  1. the capillaries are much further from the heart than the aorta.
  2. the very narrow capillaries present a large resistance to blood flow compared to the large diameter aorta.
  3. the total cross-sectional area of the lumens of the capillaries is much greater than the cross-sectional area of the aorta.
  4. the length of the aorta is short compared to the length of a capillary.
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waelhammad
2022-10-18
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C: The “equation of continuity” may be stated: volume flow rate = cross-sectional area × speed of flow. Hence if the total cross-sectional area of capillaries is very large (as it is), the speed of flow can be very slow while still allowing the required volume flow rate.

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