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During the resting state of a neuron, the axonal membrane is more permeable to potassium ions (K+) primarily due to the presence of more open potassium channels compared to sodium channels. This higher permeability allows K+ to flow out of the cell, contributing to the negative resting membrane potential. The electrochemical gradient also favors K+ efflux, as the inside of the neuron is negatively charged relative to the outside. Consequently, the resting membrane potential is largely determined by the movement of K+ ions.
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Are ribosomes associated with axon?
Ribosomes are primarily involved in protein synthesis and are typically found in the cytoplasm of cells, including neurons. While they are not directly associated with the axon itself, ribosomes can be found in the cell body and dendrites of neurons, where they produce proteins necessary for axonal function and maintenance. In some cases, ribosomes may also be present in the axonal cytoplasm, contributing to local protein synthesis critical for axonal growth and repair.
What is axonal transmission?
Axonal transmission is the process by which electrical signals are transmitted along the axon of a neuron. It involves the propagation of action potentials, or electrical impulses, from the cell body of the neuron to the axon terminals where neurotransmitters are released. This process is essential for communication between neurons in the nervous system.
What is the difference between the axon and axonal terminal and synaptic knob?
The axon is a long, slender projection that carries electrical impulses away from the cell body. The axonal terminal, or synaptic knob, is the end of the axon that forms a synapse with another neuron or target cell. The synaptic knob contains neurotransmitter vesicles that are released into the synapse to communicate with the next cell.
What is synaptic facilitation?
an action will happen cause of axo-axonal syanapse,which can facilitate the nerve impulse transmitting from presynaptic membrane to post synaptic membrane. In the axo-axonal synapse one axon is secreting serotonin which can influence to close some of K+ channels in the other neuron to maintain a prolonged action potential by slowing down the repolarization. as long as action potential is there it can stimulate the presynaptic membrane to release neurotransmitters towards postsyanptic membrane so prolonged action potential will help to stimulate more the Post synaptic membrane and give a strong impulse this is called presynaptic facilitation
What happens to your acetylcholine when you stumble?
from answers.com When a nerve impulse reaches an axon ending, voltage-gated calcium channels in the axonal membrane open and calcium, which is extremely low inside the cell, enters the nerve ending. The increase in calcium-ion concentration causes hundreds of synaptic vesicles to fuse with the cell membrane and expel acetylcholine into the synaptic cleft (exocytosis). The acetylcholine released at a neuromuscular junction binds reversibly to acetylcholine receptors in the muscle end-plate membrane, a postsynaptic membrane that is separated from the nerve ending by a very short distance. The receptor is a cation channel which opens when two acetylcholine molecules are bound, allowing a sodium current to enter the muscle cell and depolarize the membrane. The resulting impulse indirectly causes the muscle to contract.
What is axonal insulation?
Penis
What does axonal mean?
Axonal refers to something related to an axon, which is a long, slender projection of a nerve cell that conducts electrical impulses away from the cell body. Axonal processes are crucial for transmitting information within the nervous system.
Imagin a neuro that has several hundred axonal knobs impinging on it The majority of these axonal knobs are shown to be firing however the neuro in question does not transmit an impulse Give a vallid?
The scenario described suggests that the neuro is experiencing a phenomenon known as spatial or temporal summation, where the input from several axonal knobs doesn't reach the threshold needed to trigger an action potential. This could be due to inhibitory inputs counteracting the excitatory signals, or the net depolarization may not be sufficient. Additionally, factors like the refractory period, ion channel dynamics, or the integration properties of the neuron's membrane could prevent impulse transmission despite the firing of multiple axonal knobs.
Is saltatory conduction faster than conduction on an unmyelinated fiber?
wherever the Schwann cells wrap around the axon, the sodium and potassium ions cannot cross the membrane; the Schwann cells wrap too tightly around the axonal membrane for there to be any extracellular space underneath them. Therefore, the only place that an action potential can occur is at the node of Ranvier-- the space between the Schwann cells. Because of this, the action potential seems to jump from node to node along the axon. "Jumping" is what the word "saltatory" means.
Substance released at axonal endings to stimulate a nervous impulse is?
a neurotransmitter
Can you get tremors with peripheral neuropathy?
yes absolutely...I have tremors with axonal neurapathy.
The actual gap between the axonal terminal and the muscle cell is?
synaptic cleft
What is the role of acctylcholinesterase?
Destroy ACh a brief period after its release by the axonal endings.
Are ribosomes associated with axon?
Ribosomes are primarily involved in protein synthesis and are typically found in the cytoplasm of cells, including neurons. While they are not directly associated with the axon itself, ribosomes can be found in the cell body and dendrites of neurons, where they produce proteins necessary for axonal function and maintenance. In some cases, ribosomes may also be present in the axonal cytoplasm, contributing to local protein synthesis critical for axonal growth and repair.
Within the axonal endings are many small vesicles containing a neurotransmitter substance called?
Acetylcholine
What is axonal recruitment?
Axonal recruitment refers to the process by which motor neurons control muscle contraction by selectively activating more or fewer muscle fibers. As the strength of a muscle contraction increases, more motor units are activated and more muscle fibers are recruited, leading to a more forceful contraction. Axonal recruitment plays a crucial role in the fine control of movements and is essential for activities that require varying degrees of force, such as lifting objects of different weights or controlling the speed and force of movements during physical activities.
A synapse formed between the axonal ending of one neuron and the cell body of another neuron?
True
