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

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

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

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

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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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Solution

The correct option is 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 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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Similar questions

Fill in the blanks of the following paragraph using just two words – arteries and veins

___(a)___ carry oxygen-rich blood from the heart to all parts of the body and ___ (b)___ carry carbon dioxide-rich blood from all parts of the body back to the heart. ___ (c)___ have thin walls and ___ (d)___ have thick elastic walls. Blood flows at high pressure in ___ (e)___. Valves are present in ___ (f) ___ which allow blood to flow only towards the heart. ___ (g)___ divide into smaller vessels. These vessels further divide into extremely thin tubes called capillaries. The capillaries join up to form ___ (h)___.

Q. The total area of cross section is 0.25 m

^{2}

. If blood is flowing at the rate of 100

c m^{3} s^{- 1}

, then the average velocity of flow of blood through the capillary, in

m m s^{- 1}

is:

Q. Blood is ﬂowing at the rate of

200 c m^{3} / s

in a capillary of cross sectional area

0.5 m^{2}

. The velocity of flow in mm/s is:

Q. Match the definition to the correct term in the given list.
A thin-walled blood vessel that carries blood from capillaries to the heart.

Vein, cardiac cycle, cardiac output, heart rate, heart beat, double circulation, circulatory system, extracellular fluid, intercellular fluid, myogenic heart, neurogenic heart.

Blood is flowing at the rate of 200 cm³/s in a capillary of cross-section area 0.5 m². The velocity of flow is mm/s is

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