Question

Through what blood vessel is blood flow the slowest and why is this beneficial?

Answer 1

Answer:

Capillaries. Slower speed enables more time for oxygen, nutrient, and waste transfer to occur at the level of the tissues.

Explanation:

This is a physical property of the circulatory system. Capillaries collectively have the highest cross-sectional area, and therefore have the lowest flow rate (by Poiseuille's Law).