PATHOLOGY

PATHOLOGY MCQ

NERVOUS SYSTEM

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Faster way that an action potential travels along an axon
A
saltatory
B
continuous
C
Either A or B
D
None of the above
Explanation: 

Detailed explanation-1: -Saltatory conduction is the propagation of action potentials along myelinated axons from one node of Ranvier to the next node, increasing the conduction velocity of action potentials. Hence, an action potential traveling along an axon moves faster than a neurotransmitter.

Detailed explanation-2: -Saltatory conduction is faster compared to an unmyelinated neuron because it prevents diffusion of the electrical signal through the membrane and allows the action potential to “jump” down the axon. Saltatory conduction occurs when an axon is myelinated.

Detailed explanation-3: -Action potentials travel down neuronal axons in an ion cascade. Positive ions (mostly sodium ions) flow into the cell body, which triggers transmembrane channels at the start of the axon to open and to let in more positive ions.

There is 1 question to complete.