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Can a myelinated axon have a larger diameter than an unmyelinated axon?
Yes, a myelinated axon can have a larger diameter than an unmyelinated axon. Myelin sheath covers the axon, and the diameter of the axon itself can vary independently of myelination. The larger diameter of a myelinated axon allows for faster conduction of nerve impulses compared to unmyelinated axons.
Why are nerves myelinated?
Nerves are myelinated to increase the speed of nerve impulse conduction. The myelin sheath acts as insulation, helping the nerve signal to travel faster along the axon. This allows for more efficient communication between different parts of the body.
Which of the following does not factor into the rate of impulse propagation?
One factor that does not influence the rate of impulse propagation is the size of the neuron. The rate of impulse propagation is determined mainly by the myelination of the axon, the presence of nodes of Ranvier, and the diameter of the axon.
Conduction along a myelinated axon is called?
It is called saltatory conduction. This describes the "jumping" of an action potential from node to node on a myelinated axon.
A myelinated nerve fiber is characterized as being whereas an unmyelinated?
Myelinated nerves are white, and composes the white matter of the brain and spinal cord they also are able to pass an action potential down an axon much faster; Unmyelinated nerves are gray, and composes the gray matter of the brain and spinal cord. These nerves transmit signals much slower
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"
Can a myelinated axon have a larger diameter than an unmyelinated axon?
Yes, a myelinated axon can have a larger diameter than an unmyelinated axon. Myelin sheath covers the axon, and the diameter of the axon itself can vary independently of myelination. The larger diameter of a myelinated axon allows for faster conduction of nerve impulses compared to unmyelinated axons.
What is the side branch of the axon?
The side branches of the axon are called axon collaterals. They are smaller branches that extend from the main axon and allow for communication with multiple target cells simultaneously. Axon collaterals play a key role in neural communication and signal transmission.
What is the output structure of a neuron?
The axon is the output structure of a nerve cell. Many times it is myelinated like an electrical wire.
How fast does an action potential travel down a myelinated nerve?
An action potential is not passively propagated down the axon. There have to be ion channels along the axon or else the action potential will gradually decay. So the the rate of that the action potential 'travels' is dependent on the passive property called the length constant of the axon (factor in capacitance, axon diameter) plus the density of ion channels.
Are the nodes of ranvier found at a regular interval only on myelinated peripheral nerve fibers?
No, the nodes of Ranvier are found at regular intervals on both myelinated central and peripheral nerve fibers. They are gaps in the myelin sheath where the axon is exposed, allowing for the propagation of action potentials along the nerve fiber.
Helmholtz's experiment with the frog's nerve indicated that the speed of the nervous impulse was?
Conduction velocities are specific to each person and depend largely on an axon's diameter and the degree to which that axon is myelinated. Some myelinated neurons conducting at speeds up to 120 m/s (432 km/h).
What minimizes leakage of the electrical current traveling along the axon?
The nodes of Ranvier along myelinated axons in sensory nerve fibers minimize leakage of the nerve impulse electrical signal.
What is myelinated nervous tissue?
Myelinated nervous tissue is composed of nerve cells with a fatty substance called myelin sheath covering their axons. This sheath acts as insulation, speeding up the transmission of nerve impulses along the axon. Myelinated tissue is found in the brain, spinal cord, and peripheral nervous system.
The neurolemma and the myelin of the myelinated axons are interrupted at regular intervals along the axon by?
The gap between each myelinated section of an axon is known the node of ranvier.
Why are nerves myelinated?
Nerves are myelinated to increase the speed of nerve impulse conduction. The myelin sheath acts as insulation, helping the nerve signal to travel faster along the axon. This allows for more efficient communication between different parts of the body.
Does impulse travel faster along myelinated neuron?
Yes, impulses travel faster in myelinated axon rather than in unmyelinated. It is mostly due to nodes of Ranvier. Instead of travel along the axon, in myelinated axon impulses "jump" from node to node. Also there are two types of myelinated axons: type A and type B. (Type C in unmyelinated axon.) Type A is the fastest among all of them.
