0
What else can I help you with?
In a myelinated fiber only the initial segment in the trigger zone have voltage-regulated channels?
In a myelinated fiber, voltage-regulated channels are concentrated at the nodes of Ranvier along the axon. These nodes are where action potentials are regenerated, allowing for faster conduction of the electrical signal compared to unmyelinated fibers. The initial segment before the first node acts as the trigger zone for action potential initiation.
Why speed of unmyelinated nerve fibre is more than myelinated nerve fibre when diameter is small?
The speed of unmyelinated nerve fibers can sometimes exceed that of myelinated fibers when the latter have a smaller diameter because conduction velocity in unmyelinated fibers is influenced by their ability to propagate action potentials continuously along their length. In smaller-diameter myelinated fibers, the presence of myelin can create a higher resistance, which can slow conduction. However, as fiber diameter decreases, the benefits of myelination (such as saltatory conduction) may not compensate for the increased resistance, allowing some unmyelinated fibers to conduct impulses more rapidly. Thus, in specific cases, unmyelinated fibers can outpace smaller myelinated fibers due to these factors.
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 non-myelinated nerve fiber?
a nerve fiber that lacks the fatty myelin insulating sheath. Such fibers form the gray matter of the nervous system, as distinguished from the white matter of myelinated fibers. Also called nonmedullated nerve fiber.
How does conduction differ on myelinated vs unmyelinated axons?
Very simples, myelinated axons have a myelin sheath! These are produced by the schwann cells in the Peripheral Nervous System and oligodendrocytes in the Central Nervous System. The myelin sheath is made out of lipids (fats) and proteins. The benefits of a myelinated axons is a faster transmission of an electrical impulse and also insulation. The breakdown of a myelin sheath from a medical background results in Demyelination.Tortora, G, Derrickson, B (2009) Principles of Anatomy and Physiology, Wiley, Asia, 12th Edition, Volume 1, Pages 416-423Hope this helps!
COnduction speed of a nerve fiber would be the fastest in a?
Myelinated nerve fiber with a large diameter would have the fastest conduction speed. The myelin sheath allows for saltatory conduction, where the action potential jumps from one node of Ranvier to the next, speeding up conduction. A large diameter also reduces resistance to current flow, further increasing conduction speed.
Which of the following types of nerve fiber possesses the fastest speed of impulse propagation?
Myelinated A fibers have the fastest speed of impulse propagation among nerve fibers.
Does an unmyelinated fiber conduct impulses faster than a myelinated fiber?
False
What are the factors which affect the nerve conduction velocity?
The factors affecting nerve conduction velocity are as follows:(i) Axon diameter:An axon with a larger diameter conducts faster. In an unmyelinated fiber, the speed of propagation is directly proportional to the square root of the fiber diameter (D), i.e.,Conduction velocity a D(ii) Myelination and saltatory conduction:Myelination speeds up conduction. Thus, the action potential travels electrotonically along the long myelinated segments, and fresh action potentials are generated only at the nodes. This is called saltatory conduction. In a myelinated neuron, the conduction velocity is directly proportional to the fiber diameter (D).(iii) Temperature:A decrease in temperature slows down conduction velocity, (iv) Resting membrane potential. Effect of RMP changes on conduction velocity is quite variable. Usually, any change in the RMP in either direction (hyper polarization or depolarization) slows down the conduction velocity.
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.
In a myelinated fiber only the initial segment in the trigger zone have voltage-regulated channels?
In a myelinated fiber, voltage-regulated channels are concentrated at the nodes of Ranvier along the axon. These nodes are where action potentials are regenerated, allowing for faster conduction of the electrical signal compared to unmyelinated fibers. The initial segment before the first node acts as the trigger zone for action potential initiation.
What does saltatory mean?
"Saltatory" typically refers to a process or movement that is characterized by jumping or leaping. In biology, it can refer to saltatory conduction, in which nerve impulses jump between nodes of Ranvier along a myelinated nerve fiber.
Why speed of unmyelinated nerve fibre is more than myelinated nerve fibre when diameter is small?
The speed of unmyelinated nerve fibers can sometimes exceed that of myelinated fibers when the latter have a smaller diameter because conduction velocity in unmyelinated fibers is influenced by their ability to propagate action potentials continuously along their length. In smaller-diameter myelinated fibers, the presence of myelin can create a higher resistance, which can slow conduction. However, as fiber diameter decreases, the benefits of myelination (such as saltatory conduction) may not compensate for the increased resistance, allowing some unmyelinated fibers to conduct impulses more rapidly. Thus, in specific cases, unmyelinated fibers can outpace smaller myelinated fibers due to these factors.
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"
Area where action potentials are generated during saltatory conduction?
Action potentials are generated at the nodes of Ranvier during saltatory conduction. These nodes are the non-myelinated gaps found along the axon where the action potential can occur, allowing for faster transmission of the electrical signal down the nerve fiber.
How would depressants affect the resting membrane potential?
the conduction of neural information to the muscle fiber
Mechanism of nerve conduction?
Nerve conduction involves the transmission of electrical impulses along the length of a nerve fiber. When a nerve is stimulated, sodium ions rush into the nerve cell, causing a change in electrical charge. This creates an action potential that travels down the nerve fiber, activating adjacent areas and allowing the signal to be transmitted. Once the impulse reaches its destination, neurotransmitters are released to stimulate the next nerve cell or muscle fiber.
