The velocity of blood flow

A. False  It is low because the capillary bed has a large total cross-sectional area.

B. True   The venous bed has a smaller total cross-sectional area than the venular bed.

C. True   There is a brief period of retrograde flow as the aortic valve closes.

D. True   Axial flow occurs in large vessels; near the walls, flow velocity is zero

E. False  It rises due to the compensatory increase in cardiac output.