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No, a myelin sheath speeds up the rate of nerve transmission.
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What are nerve axon tracks made of?
The axons of nerve cells are surrounded by myelin sheeths - a protective covering that allows for saltatory conduction down the axons, increasing speed and decreasing loss of signal. Axons make up the tissue known as "white matter."
Which transcription factor is most likely when down-regulated to cause oligodendrocites to not form correctly?
In the developing demyelinization plates there can be found a disintegration of the myeline sheaths, reduced oligodendrocites and discrete lesions of the axes, as well as the rest of the myeline sheaths incorporated into the phagocytes.
Why does myelin on the surface of an axon causes a speedier transmission of a nerve impulse down the axon?
Because the cytoplasm of the axon is electrically conductive, and because the myelin inhibits charge leakage through the membrane, depolarization at one node of Ranvier is sufficient to elevate the voltage at a neighboring node to the threshold for action potential initiation. Thus in myelinated axons, action potentials do not propagate as waves, but recur at successive nodes and in effect "hop" along the axon, by which process they travel faster than they would otherwise.
This enzyme breaks down norepinephrine in nerve fibers?
norepinephrinase
Do nerve impulses travel down the internodal pathways from the av node?
no
Multiple sclerosis Is a disease in which the immune system attacks the bodys nerve cells?
Yes, sort of. In MS patients, leukocytes have crossed the blood-brain barrier and have entered into the central nervous system. There they attack the oligodendrocytes and the myelin sheaths they have produced to protect nerve axons. This can directly cause damage to the nerve or it can leave the nerve unprotected. Also, it greatly slows down the action potential in affected neurons, inhibiting nerve functioning in inflicted areas.
Multiple sclerosis is a disease in which immune system attacks the body's nerve cells?
Yes, sort of. In MS patients, leukocytes have crossed the blood-brain barrier and have entered into the central nervous system. There they attack the oligodendrocytes and the myelin sheaths they have produced to protect nerve axons. This can directly cause damage to the nerve or it can leave the nerve unprotected. Also, it greatly slows down the action potential in affected neurons, inhibiting nerve functioning in inflicted areas.
How does the myelin sheath and synapse affect nerve impulses speed up or slow down?
Myelin sheath insulates axons for speedier signaling
What effect will multiple sclerosis a degenerative disorder that cause myelin to disintegrate have on a person's nerve impulses?
They will slow down
What is the function of myelin sheath?
The function of the myelin sheath is to insulate the axon of the neuron. When there are gaps in the sheath, known as nodes of Ranvier, the nerve impulse can jump from gap to gap, thus increasing greatly the speed of conduction of the nerve impulse. This is known as saltatory conduction.
What are nerve axon tracks made of?
The axons of nerve cells are surrounded by myelin sheeths - a protective covering that allows for saltatory conduction down the axons, increasing speed and decreasing loss of signal. Axons make up the tissue known as "white matter."
What is myelin rich in?
Myelin is the material that surrounds and protects the spinal cord, and it helps conduct information signals up and down the cord. Myelin is rich in protein.
Imagine two neurons one is wrapped with a myelin sheath and has a large diameter the second neuron has no myelin sheath and a narrow diameter which of these neurons conducts a nerve impulse more rap?
Neurons send their impulses up and down the spinal cord. The myelin sheath is the coating around the spinal cord that protects it, and works to better conduct the signals along the cord. A neuron that has no myelin sheath will have a harder time conducting signals than one that is covered by the sheath.
What is a function of fats?
Fats are very important in our lives. providing for example the materials for components of cell membranes, of the myelin sheaths that electrically insulate nerve fibres. It is also a reservoir for storing excess energy obtained from the diet.
What is the nervous tissue involved in multiple scoliosis?
Along the axon of a neuron there is an insulating fatty substance called the myelin sheath. With MS the myelin breaks down so the neuron/nerve loses its capability of conducting impulses. Therefore 'messages' sent via the motor nerves eventually do not reach muscles and the patient has problems controlling movement which can lead to paralysis.
Myelin?
DefinitionMyelin is an insulating layer that forms around nerves, including those in the brain and spinal cord. It is made up of protein and fatty substances. The purpose of the myelin sheath is to allow rapid and efficient transmission of impulses along the nerve cells. If the myelin is damaged, the impulses slow down. This can cause diseases like multiple sclerosis.
Why does myelination create speed?
This question could probably be asked more clearly. Myelinization of a nerve fiber helps the nerve's signalpropagate more quickly. Think of the nerve cell as a length of wire, and the myelin as the rubber insulation on the wire. Each nerve cell allows an electrical signal to pass down it's axon. If there is insulation around the nerve (myelin) then the signal is contained within the nerve cell, and passes quickly to the end of the nerve cell. Demyelinated nerve cells do not have this insulation keeping the electrical signal in the cell; so the signal can travel to adjacent cells. The net effect is that the signal either never reaches the end of the intended axon (such as with multiple sclerosis), or the signal takes longer to get there. Some nerve cells (grey matter, for example) are not intended to be myelinated. These cells are designed to act without insulation, so either the signal is supposed to travel to adjacent cells, or it is supposed to take relatively longer to reach the end of the axon.
