Question

Which of the following help increase speed of conduction through nerve fibres?

• A. Having thicker nerve fibres
• B. Myelination around nerve fibres
• C. Having unmyelinated nerve fibres.
• D. Having impulses jump from one node to another

Answer 1

Answer: (A), (B), (D)

Having impulses jump from one node to another

Having thicker nerve fibres can enable carrying of more charges or ions without dissipation. Myelin is a fatty substance that increase the insulation of the nerve fibres. The myelinated nerve fibres have gaps at regular intervals, where there is an absence of myelin sheath. These gaps are called Nodes of Ranvier. The electrical impulses jump from one node to another, thereby increasing the speed of conduction.