This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Shape of the arterial pulse is influenced by 
Select and explain. 
A. Viscosity of blood, B. Velocity of blood, C. Arterial wall expansion, D. Cross sectional area of artery
C: Arterial wall expansion
Answer: C: Arterial wall expansion 
Explanation: Arterial pulse is caused by the ventricular systole that leaves a pressure wave along the arterial wall during each contraction.