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The velocity of blood flow is the lowest in capillaries because: A The capillary walls are not thin enough to allow oxygen to exchange with the cells. B The capillaries are far from the heart, and blood flow slows as distance from the heart /increases. C The diastolic blood pressure is too low to deliver blood to the capillaries at a high flow rate. D The total cross-sectional area of the capillaries is greater than the total cross-sectional area of the arteries or any other part of the circulatory system.

The velocity of blood flow is the lowest in capillaries because:

A

The capillary walls are not thin enough to allow oxygen to exchange with the cells.

B

The capillaries are far from the heart, and blood flow slows as distance from the heart /increases.

C

The diastolic blood pressure is too low to deliver blood to the capillaries at a high flow rate.

D

The total cross-sectional area of the capillaries is greater than the total cross-sectional area of the arteries or any other part of the circulatory system.

 
 
 

Grade:9

1 Answers

Adarsh Pal
askIITians Faculty 159 Points
3 years ago

The velocity of blood flow is inversely proportioned to the total cross-sectional area of blood vessels. As the total cross-sectional area of the vessels increases, the velocity of flow decreases. Blood flow is slowest in the capillaries, which allows time for exchange of gases and nutrients.

So the correct answer is 'The total cross-sectional area of the capillaries is greater than the total cross-sectional area of the arteries or any other part of the circulatory system'.

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