The velocity of blood flow is ________.

Question

Quizplus · Accepted Answer

The total cross-sectional area of capillaries is the greatest, leading to the slowest velocity of blood flow. This allows for efficient exchange of gases and nutrients. Choice A is incorrect because although veins have a larger diameter, they also have a higher number of vessels, resulting in a similar cross-sectional area as arteries. Choice C is incorrect because blood flow velocity is inversely proportional to the total cross-sectional area of blood vessels, meaning that it is faster in smaller vessels. Choice D is also incorrect because arteries have a smaller diameter than veins, leading to faster blood flow velocity.

The Velocity of Blood Flow Is ________