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Would conduction speed of a nerve fiber be the fastest in a large or small myelinated fiber?
Yes. Myelinated fibers have a myelin sheath around them which keeps the impulse from scattering and on a direct path. This makes the impulse travel faster than unmyelinated fibers.
Do some neurons lack myelin?
A nerve cell with a myelin sheath. The sheath acts as an insulator of electrical conduction which is how the nerve cell conducts action potential. It conducts faster because the insulator prevents flow of ions right beside the channels that are being activated. So it 'skips' distance.
Do Signals travel along nerves in the form of rapidly diffusing neurotransmitters?
yes bcoz of myelin sheaths on the neurons .. they help the signal to move by jumping ... so that it moves faster with the help of neurotransmitters like acetyl choline .which helps in fast coduction of nerve impulse ..they r found generally at nerve endings to transfer the signal from 1 neuron to other.
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.
The special mode of impulse travel is called?
Propagation
What is the fatty tissue that helps the impulse move faster as they travel from cell to cell?
The Myelin sheath
What is a neuron identify the parts of the neuron and their functions?
there's the axon (the nerve) the electrical impulse goes down that and covering the axon is the myelin sheath, otherwise known as a fatty sheath which insulates and helps make the electrical impulse go faster. In between each myelin sheath there are synapses (gaps between each one) and the impulse has to cross the gap so neurotransmitters are released which bind to receptors on the other side creating another electrical impulse which makes it travel even faster.
What are specialized coverings of the axon?
Myelin covers the axon to protect it and help messages travel faster. Two types of cells produce myelin, the oligodendrocytes in the CNS and Schwann cells in the PNS.
Would conduction speed of a nerve fiber be the fastest in a large or small myelinated fiber?
Yes. Myelinated fibers have a myelin sheath around them which keeps the impulse from scattering and on a direct path. This makes the impulse travel faster than unmyelinated fibers.
Why is a high fever dangerous?
The cells in your brain are called neurons. The White Matter of your brain is composed of neurons that have a myelin sheath on them (this makes the impulse travel faster). The myelin sheath is made up of lipids (fats). Fat melts when it gets hot. So, essentially, if your brain gets too hot, it will melt. That would be bad.
How fast does myelin sheath travel?
The speed at which your nerve impulses travels is dependent on the type of fiber. On fibers that allow the nerve to travel faster can reach speeds of over 200 miles per hour.
These cover the axonin order to make nerve signals faster?
Some axons have an insulating coating, called the fatty myelin sheath, to make signals travel faster.
Do some neurons lack myelin?
A nerve cell with a myelin sheath. The sheath acts as an insulator of electrical conduction which is how the nerve cell conducts action potential. It conducts faster because the insulator prevents flow of ions right beside the channels that are being activated. So it 'skips' distance.
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.
What is the relationship between myelin and the propagation speed of action potentials?
Electrical signals travel faster in axons that are insulated with myelin. Myelin, produced by glial support cells, wraps around axons and helps electrical current flow down the axon (just like wrapping tape around a leaky water hose would help water flow down the hose).Myelin insulation does not cover the entire axon. Rather there are breaks in the wrapping. These breaks are called nodes of Ranvier. The distance between these nodes is between 0.2 and 2 mm.Action potentials traveling down the axon "jump" from node to node. This is called saltatory conduction which means "to leap." Saltatory conduction is a faster way to travel down an axon than traveling in an axon without myelin.
What is the fatty insulating material that surounds the axons?
The fatty substance around the axons of WHITE MATTER in the brain, and around PERIPHERAL axons is called MYELIN. The axons of GREY matter in the brain are NOT myelinated, nor do they need to be, because the axons travel only short distances. Myelin insulates the axons of neurons so that impulses can travel longer distances along the nerve faster, without losing strength. Without myelin around longer axons (think of it as the rubber coating around electrical wires), the nerve impulses can't travel as fast with constant strength, or may get stopped altogether. Demyelinating diseases such as multiple sclerosis or ALD damage or (for the lack of a better term) dissolve myelin or prevent it from being produced so that nerve signals are unable to travel along the neuron.
Do Signals travel along nerves in the form of rapidly diffusing neurotransmitters?
yes bcoz of myelin sheaths on the neurons .. they help the signal to move by jumping ... so that it moves faster with the help of neurotransmitters like acetyl choline .which helps in fast coduction of nerve impulse ..they r found generally at nerve endings to transfer the signal from 1 neuron to other.
