The velocity of blood flow is the lowest in capillaries because:AThe capillary walls are not thin enough to allow oxygen to exchange with the cells.BThe capillaries are far from the heart, and blood flow slows as distance from the heart /increases.CThe diastolic blood pressure is too low to deliver blood to the capillaries at a high flow rate.DThe 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.

Shamit Jain , 4 Years ago

Grade 9