00:01
This question asks, all of the following are associated with the myelin sheet, except faster conduction of nerve impulses, nodes of ranvier, forming gaps along the axon, increased magnitude of the potential difference during an action potential, or solstatory conduction of action potentials.
00:19
So the myelin is actually going to be composed of this white lipid -containing material, and it's the schwann cells that actually produce the myelin sheet that encompasses the axon.
00:31
And it's important to note that if we take a look at our axon, the myelin and these schwan cells will actually have little gaps in between them.
00:46
And these gaps are going to be called the nodes of ranva.
00:51
So these gaps right here are the nodes of ranva.
01:05
So this means that we can eliminate choice b.
01:09
And choice b says that nodes of ranva form gaps along the axon because of the node.
01:14
We know that this is a true statement.
01:17
They form gaps along the axon due to the myelin sheath.
01:22
And then we know that myelin increases the conduction velocity by basically insulating the axon so that the membrane is going to only be permeable to ions at the nodes of ranvier.
01:35
Meaning ions are blocked from reaching the axon by the myelin sheath so they can only reach the axon at the nodes of ranva, because that is the only portion of the axon that is open to the extracellular environment...