Question

Choose the correct answer from the alternatives given.
Blood flows through blood vessels because of:

• A. Its viscosity
• B. Establishment of a pressure gradient
• C. Elasticity of the veins
• D. Length of the blood vessels

Answer 1

The correct option is B Establishment of a pressure gradient

Blood flows in the same direction as the decreasing pressure gradient: arteries to capillaries to veins. Hence it can be also said that blood flows through blood vessels because of the establishment of a pressure gradient. The heart is from where the pressure is generated for blood throughout the body.

So, the correct option is 'Establishment of a pressure gradient'