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What are gaps in myelin sheath that allow nerve impulses to quickly move down the axon by jumping from section to section?
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Impulses are conducted rapidly if is present?
Myelin
What is the primary function of the myelin sheath is to?
Myelin is a lipid which surrounds the axon and provides for faster and more complex neural conduction.
When the nerve impulse encounters a myelin-covered section of neuron?
it jumps over the myelin
State the structure of neurons which reduces leakage of impulses?
Myelin sheath, which is only found on long axons (white matter), not on short cortical neurons (grey matter).
What purpose does the myelin covering an axon serve?
insulating sheath that speeds up the transmission of impulses along an axon
Why is the myelin sheath so important to the nervous system?
Myelin is a fatty substance that insulates and protects nerve cells and allows them to transmit electrical signals quickly.
Impulses are conducted rapidly if is present?
Myelin
Are impulses conducted rapidly if neurotransmitters are present?
Myelin
How does the myelin sheath and synapse affect nerve impulses speed up or slow down?
Myelin sheath insulates axons for speedier signaling
What are the three ways in which neurons are specialized to transmit nerve impulses very quickly?
they turn in to light and go through three bones...
Does myelin sheath transmits impulses from one nuron to another?
Myelin sheath never transmits the impulse from one neuron to another. On the contrary these are insulating cells which prevent transmission of nerve impulses.
What would happen if the neuron did not have a myelin sheath?
if neurons didn't have myelin sheath then the transmission of nerve impulses is slowed or stopped
Neural impulses speed increases when the axon is encased by what?
Myelin Sheath
What is the primary function of the myelin sheath is to?
Myelin is a lipid which surrounds the axon and provides for faster and more complex neural conduction.
What is the significance of myelination?
Most nerve fibers are surrounded by an insulating, fatty sheath called myelin, which acts to speed up impulses. The myelin sheath contains periodic breaks called nodes of Ranvier. By jumping from node to node, the impulse can travel much more quickly than if it had to travel along the entire length of the nerve fiber. Myelinated nerves can transmit a signal at speeds as high as 100 meters per second. If the myelin sheath surrounding nerve fibers is damaged or destroyed, transmission of nerve impulses is slowed or blocked. The impulse now has to flow continuously along the whole nerve fiber -- a process that is much slower than jumping from node to node. Loss of myelin can also lead to 'short-circuiting' of nerve impulses. An area where myelin has been destroyed is called a lesion or plaque. This slowing and 'short-circuiting' of nerve impulses by lesions leads to a variety of symptoms related to nervous system activity. Symptoms can include sensory impairment, such as blurred vision, difficulties in controlling movement, and problems with bodily functions, such as failure to control urination. Demyelinating disease may result in vision or hearing loss, headaches, seizures, muscle spasms and weakness, loss of coordination, paralysis, and loss of sensation.
What is the fatty tissue that covers axons and speeds up impulses as they travel from cell to cell?
That substance is called the myelin cell or myelin sheath.
Which structure if the neuron transmits an impulse through the myelin sheath?
Neural impulses (action potentials) are transmitted through axons which are covered in a myelin sheath for insulation.
