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A nerve fiber becomes polarized when the resting potential of the membrane changes. It starts out with an unequal distribution of charges- the outside is more positive and the inside is less positive. (Sodium (Na+) is in a higher concentration on the outside of the membrane and Potassium (K+) is in a lower concentration on the inside of the membrane.) A stimulus changes the gradient- when more Na+ flows in, the resting potential changes and polarization occurs, allowing for an action potential to be propagated down the axon.
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Does a neuron become depolarized during an inhibitory postsynaptic potential?
False
What fiber transmits impulses to the central nervous system?
The nerve fiber.
Why a peripheral nerve such as the sciatic nerve can contain nerve fiber from several spinal nerves?
The reason why a peripheral nerve such as the sciatic nerve can contain nerve fiber from several spinal nerves is owing to nerve plexuses. These are networks of nerves all tangled together and found mostly in the limbs.
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 is the size and shape of a nerve cell related to its function?
A neuron is a nerve cell in which, are circular cells that are bundled together known as ganglion. A actual nerve is attached to the nerve cell. There are two types of nerves ones that travel messages from the brain or to the brain. A nerve fiber that sends messages from the brain is called an axon fiber. The structure of an axon fiber includes myelin, which is a fatty substance stored on the outside of the nerve fiber to speed the message up. between each piece of myelin is a space called the node of ranvier that speeds the impulse up to. An alkali metal that is common and vital for all nerves is sodium. When a nerve impulse is taken place, the electrical activity passes through the sodium. Once the electrical activity has passed through the sodium atoms they become neutrally charged as they move towards the outside of the nerve fiber. The second type of nerve fiber is named a dendrite. The only difference the dendrite has is that it has no myelin sheath on the outisdeof the nerve to speed it up and also travels a lot slower than the axon fiber. Nerve fibers are bundled together in an actual nerve as the surrounding substance that keeps the nerve fibers together in the nerve is called perineurium. Towards the outside of the perineurium cluster is a substance named epineurium.
How is nerve impulse conducted along a myelinated nerve fiber?
In non-myelinated axons, the nerve impulse is going to be produced when the action potential accross a membrane makes a wave of depolarization followed by a wave of repolarization. With the absence of the myelin, the impulse is transmitted continuously throughout the membrane. In a non-myelinated nerve, once an end of the cell, the dendrite, is depolarized, the depolarization a.k.a., the action potential, moves along the nerve membrane, and the area of membrane immediately behind the depolarized section becomes repolarized.
What is required to maintain nerve fiber sheath?
required to maintain nerve fiber sheath
What is the difference between the contour and magnitude of single nerve fiber and nerve trunk?
What is the difference between the contour and magnitude of single nerve fiber and nerve trunk?
Does a neuron become depolarized during an inhibitory postsynaptic potential?
False
Which nerve fiber do impulses travel slowly?
Impulses travel more slowly through unmyelinated nerve fiber.
What fiber transmits impulses to the central nervous system?
The nerve fiber.
Why a peripheral nerve such as the sciatic nerve can contain nerve fiber from several spinal nerves?
The reason why a peripheral nerve such as the sciatic nerve can contain nerve fiber from several spinal nerves is owing to nerve plexuses. These are networks of nerves all tangled together and found mostly in the limbs.
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.
Mechanism of nerve conduction?
Nerve impulses are conducted along the axon in the myelinated nerve fiber with causes the polarity of the nerve.
What cause a nerve impulse move along the nerve fiber?
Electrical diferences.
What causes a nerve impulse move along the nerve fiber?
Electrical diferences.
What is the site where the muscle fiber and nerve fiber meet called?
Well of course they meet at the neuromuscular junction
