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Why speed of unmyelinated nerve fibre is more than myelinated nerve fibre when diameter is small?
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Are nerve fibers in ascending tracts myelinated?
If I was paying attention in med school, I think... The pre-ganglionic fibers are myelinated and the post-ganglionic are unmyelinated. This is in reference to the sympathetic and parasympathetic systems.
The speed of nerve impulse transmission through the axon of a sensory neuron will be quickest in?
I'm guessing; "myelinated nerve fibres" contrary to the much slower "non-myelinated nerve fibres"
What substance slows the message passing from the brain to the rest of the body?
Unmyelinated nerve fibers are slower than myelinated nerve fibers. The fibers covered by myelin are much faster.
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.
What are medullated and non- medullated nerve fibres?
Depending on the number of sheaths ,nerve fibres are of two types :-Myelinated (Medullated) Nerve Fibre.Nonmyelinated (NonMedullated) Nerve Fibre.Myelinated (Medullated) Nerve Fibre.:-are those nerve fibres which are covered by two sheaths ,myelin & neurolemma.Nonmyelinated (NonMedullated) Nerve Fibre.:-these nerve fibres are devoid of myelin sheath .However,neurolemma is present.
What is the difference in transmission between myelinated and unmyelinated fibers?
Impulse transmission on an unmyelinated nerve fiber is much slower than the impulse transmission on a myelinated nerve fiber.
Gray matter in the spinal cord is mostly?
unmyelinated axons.
At what speed are nerve impulses conducted in myelinated and unmyelinated neurons?
In thick well insulated (myelinated) neurones the impulse can travel in excess of 100m/s. In unmyelinated neurones the impulse can be conducted at less than 1m/s
What is the relationship between nerve size and conduction velocity?
velocity proportional to square root of diameter
Would you use a myelinated frog nerve an unmyelinated rat nerve or a myelinated rat nerve if you were studying nerve physiology in the laboratory?
tough one to answer really, as all three will give you different nerve conduction velocitys to a stimulus. the unmyelinated rat nerve will obviously be the least conductive, the frog nerve more conductive than that and the myelinated rat nerve more conductive again. But in general, tha main consensus would use a frog nerve, as the frog has been the choice of many a physiology lab for who knows how long.
Are nerve fibers in ascending tracts myelinated?
If I was paying attention in med school, I think... The pre-ganglionic fibers are myelinated and the post-ganglionic are unmyelinated. This is in reference to the sympathetic and parasympathetic systems.
The speed of nerve impulse transmission through the axon of a sensory neuron will be quickest in?
I'm guessing; "myelinated nerve fibres" contrary to the much slower "non-myelinated nerve fibres"
What is the relationship between size of nerve and conduction velocity?
For unmyelinated nerves there is a relationship between axon diameter and conduction velocity. Larger diameter nerves conduct faster. For myelinated nerves the a larger diameter nerve will conduct faster between the nodes of ranvier where the action potential is propagated. Conduction is said to be saltatoryas it jumps from node to node.
What substance slows the message passing from the brain to the rest of the body?
Unmyelinated nerve fibers are slower than myelinated nerve fibers. The fibers covered by myelin are much faster.
Dos a nerve damaged in surgery repair itself in due course?
The nerve fibres are covered by endoneurium. For a nerve fibre to repair this endoneural layer needs to be present. There are two types of nerve fibres--myelinated and non-myelinated. The myelinated nervefibres are covered by myelin sheath made of schwann cells. These schwann cells have the capacity to secrete substances which repair the nerve fibre. But, the non-myelinated ones don't have a full layer of schwann cells around them. So, they generally don't repair easily once being damaged. However, in any case, endoneurium should be present for a nerve fibre to repair. In damage of nerve fibre during surgery if the nerve is cut, it means the endoneurium is also cut(damaged) at that site. So, usually that nerve can not repair on its own.
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.
The velocity of nerve impulse conduction is greatest in?
Heavily myelinated, large diameter fibers
