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
About aerioles true is 
Select and explain. 
A. Resistance, B. Exchange, C. Reservoir, D. Pressure
A: Resistance
Answer: A: Resistance 
Explanation: The small aeries and aerioles are referred to as resistance vessels because they are the principal site of the peripheral resistanceRef: Ganong's Review of Medical Physiology Twenty-Third Edition Page No:543