This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nerve Physiology, Subject name: Physiology
Thickening of axon leads to - 
Select and explain. 
A. Increased speed of conduction, B. Decreased speed of conduction, C. Increased absolute refractory period, D. Unmyelination
A: Increased speed of conduction
Answer: A: Increased speed of conduction 
Explanation: Ans. is 'a' i.e., Increased speed of conduction o Thickness of nerve fiber (Axon) has linear relation with velocity (speed) of conduction.Factors affecting nerve conduction (Propagation of APIo There are many factors that affect the nerve conduction. Propagation of action potential (nerve conduction) is favoured byQ:-Low axoplasmic resistance (Ri)QLow external longitudinal resistance (Ro)High membrane resistance (Rm)QLow membrane capacitance (Cm) QHigh space constantHigh time constantThick (large) nerve - Linear relation with conduction QMyelination of nerv e Q