Question 4 The capillary surface area of a child 10 years old is 1.14 m2, of an...

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Medical Sciences

Question 4
The capillary surface area of a child 10 years old is 1.14 m2,of an adult woman is 1.6 m2, and of an adult, man is 1.9 m2. Thepulmonary blood volume per area is 271 ml/m2. Capillary bloodvolume varies between 20% and 25% of the pulmonary bloodvolume.
a) Assuming capillaries are 8 um in diameter and have an averagelength of 1 mm, calculate the range of the number of opencapillaries in the lung during rest for a child of 10 years of age,an adult woman, and an adult man during rest.
[13 marks]
b) After exercise the pulmonary blood volume doubles due tovasodilation, and there is capillary recruitment of 100%. Calculatethe number of capillaries perfused in the lungs during exercise.Justify your answer.
[6 marks]
c) What can you conclude from these estimates?
[6 marks]

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3.7 Ratings (533 Votes)

Ans Normally the pulmonary capillaries have the diameter of 6m we are assuming 8m in diameter which greater than the average diameter of pulmonary capillaries and average length is of 600microns now the See Answer

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