Question

Blood flow in veins is slower than in arteries. Give reason

Answer 1

Arteries are more muscular and have small lumen while the veins are less muscular and have comparatively larger lumen. Therefore blood flows faster in arteries than in veins.

Answer 2

Increased pressure in the veins does not decrease flow as it does in arteries, but actually increases flow. Since pressure in the veins is normally relatively low, for blood to flow back into the heart, the pressure in the atria during atrial diastole must be even lower.