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 shape of aerial pulse is influenced by 
Select and explain. 
A. Viscosity of blood, B. Velocity of blood, C. Aerial wall expansion, D. Cross sectional area of aery
C: Aerial wall expansion
Answer: C: Aerial wall expansion 
Explanation: The pressure wave generated by the ventricles expand the aerial walls as it travels, this expansion of aerial vessel wall is felt as a pulse Ref: Ganong 25th ed/page 541