Why is blood vessel C smaller in diameter than blood vessel A?
A)There is less blood volume in C
B)To create back pressure
C)There is more blood volume in A
D)A is an artery and arteries are larger than veins

Question

Why is blood vessel C smaller in diameter than blood vessel A? 
A)There is less blood volume in C 
B)To create back pressure 
C)There is more blood volume in A 
D)A is an artery and arteries are larger than veins

Quizplus · Accepted Answer

Blood vessel C is likely smaller in diameter than blood vessel A to create back pressure. This is because blood vessel C is likely a capillary, which has a smaller diameter than the artery represented by blood vessel A. Capillaries are responsible for the exchange of nutrients and waste products between the blood and surrounding tissues, and their small size creates back pressure that helps facilitate this exchange.

Why Is Blood Vessel C Smaller in Diameter Than Blood