The velocity of blood flow A. In capillaries is low because they offe

1.	The velocity of blood flow A. In capillaries is low because they offer high resistance to flow. B. In veins is greater than in venules. C. Can fall to zero in the ascending aorta during diastole. D. Is greater towards the centre of large blood vessels than at the periphery. E. In the circulation falls as the haematocrit falls.
Answer» 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.

The velocity of blood flow A. In capillaries is low because they offer high resistance to flow. B. In veins is greater than in venules. C. Can fall to zero in the ascending aorta during diastole. D. Is greater towards the centre of large blood vessels than at the periphery. E. In the circulation falls as the haematocrit falls.

Answer»

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.

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