This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
The velocity of blood is maximum in the 
Select and explain. 
A. Large veins, B. Small veins, C. Venules, D. Capillaries
A: Large veins
Answer: A: Large veins 
Explanation: Large veins have so little resistance to blood flow when they are distended that the resistance then is almost zero and is of almost no impoance. Ref: Guyton and Hall textbook of medical physiology 13th edition. Page: 184