0
Nerves
Nerves are thread-like structures that form a network of pathways that transmit information from the brain to the body and the body to the brain, in the form of electrical impulses.
1,605 Questions
Name the 3 main parts of a neuron?
The three main parts of a neuron are the dendrites, the axon, and the soma. The dendrites are the nerve endings, the axon is the body, and the soma is the cell body.
What is the freon R-134a capacity for a 96 Lumina AC 3.1 motor?
ive got the 97 3.1 and its rouhgly 30oz.
Use Google wikianswers is unlikely to be frequented by Vulcans, they be too busy for this site
How does calcium channels help a synapse create a action potential?
In more detail:
The first steps occur in an axon terminal, which is where the calcium channels are located.
When calcium channels are caused to open by the arrival of an action potential at an axon terminal, calcium ions enter the axon terminal, where the calcium ions bind to vesicles containing neurotransmitters, which causes the vesicles to fuse to the cell membrane, forming an opening through which the neurotransmitters are released into the synaptic cleft.
The neurotransmitters diffuse quickly across the synaptic cleft (the gap between two neurons), where they fit into receptors on the surface of the postsynaptic neuron, usually on a dendrite or a dendritic spine, and cause ligand-gated sodium ion pores to open, allowing sodium ions into the postsynaptic neuron, which causes an electrotonic impulse to travel down a dendrite, across the soma, to the axon hillock, where the impulses are summed up, and if a sufficient voltage potential is realized, an action potential is initiated in the initial segment of the axon.
The cell body, or soma, of the neuron contains the cell nucleus which is responsible for regulating the cell's activities. It also integrates incoming signals and decides whether or not to generate an action potential, the electrical signal that travels down the neuron.
What effects will damage do to particular structures of the brain?
It completely depends on what structures they are, how much damage, and somewhat on what individual it is. Sometimes the brain can make up for damage by shifting things... for instance that are traditionally on the left side of the brain over to the right, or whatever... storing things in a different place. Other times, and with more extensive damage, some things are permanently lost. Brain damage is extremely dangerous, and often puts people into permanent coma or a vegetative state, depending on the severity. Here is some more information on brain damage: http://en.wikipedia.org/wiki/Brain_damage These are some interesting misconceptions about the brain (for instance that we only use 10% of our brains... :)
This is not true, and probably why we can't wipe out 90% and be okay:
http://en.wikipedia.org/wiki/Human_brain#Popular_misconceptions
What is the structure of a neuron and its role in the brain?
A neuron has dendrites (as inputs), a cell body (soma), and an output (axon).
The neuron is the functional unit of the brain: neurons receive sensory information, process that information, store it, and convey commands to muscles and glands based on that information and its processing.
Noradrenaline or nor-epinephrine released in post ganglionic sympathetic nerve endings is taken up back by the nerves producing it. While acetyl choline secreted by preganglionic nerves and post ganglionic parasympathetic fibres are destroyed by the enzyme acetylcholinesterase, in milliseconds.
What is the neurotransmitter of alpha-motor neuron?
Alpha-Motor neurons release the neurotransmitter acetylcholine at a synapse called the neuromuscular junction. When the acetylcholine binds to acetylcholine receptors on the muscle fiber, an action potential is propagated along the muscle fiber in both directions.
How does electricity affect the functioning of a neuron?
Electricity excites neurons. This happens because neuronal membranes are population with special type of protein called 'voltage-sensitive ion channels'. These become more permeable to specific ions with electrical current and as a result the cell will become metabolically more active.
What are the reaction that having a great time leaping across synapses?
There are no reactions, the end of a nerve produces a gas that goes across the synapses and creates the electrical impulse on the other side of the synapses and continues the message!
It's only natural that you should feel nervous to a certain extent, or that would mean you have no interest in your audition at all. You sure want to do well and get the job and both consciously and unconsciously worry about what might happen if you don't.
To overcome these feelings, just think positively -be sure of your talents and try and do your best. Simple and easy! You may want to relax by taking a bath before your audition and maybe drink a cup of herbal tea (no medicines or drugs unless strictly necessary). When your turn comes to perform, stop worrying, take a deep breath and do whatever you have to do in the best possible manner. Shall I say 'Break a Leg'?
Does the Toyota 3a-u motor have a cambelt?
Of course it has! it can also produce up to 7500 revs. the 3AU came up first before the 4AG, they are both use for Levin and trueno coupe version of Toyota, they also both use timing belt for their Over Head Cam, the only difference is that the 3AU only have single over head cam (SOHC) while the 4AG have double over head cam (DOHC) by the way, they also have a different power output becasue 3AU only have 8 valve while 4AG have 16, anyway, perfectly uned 3AU nowadays can still kick some butt.
The receptor itself can not receive more than one signal but the cell can have more than one receptor. The signals may cancel each other out or amplify it.
This can happen at both the cell level or at the level you mention, with two or sometimes more, impulses coming from two or more neurons and their receptors. This is also called signal transduction cascades.
And yes, they can be different types of neurotransmitters.
What part of the brain is responsible for cognition?
Humans' neocortex is responsible for holding the patterns of an average of 150 relationships to other people. (Anthropological data, I'm responding on an impulse.) This is only what I know from being a complex adaptive systems nerd. Interestingly, this is directly proportional to the weight of human & other brains. (3 pounds or 1300-1400 g/ 150).The idea of proportionality in that sense, is derived from only a few well studied great ape brains.
Hope this helps.
Neurotransmitter stay for few milliseconds only in the synapse. The rate is difficult to define, but then the decay is most probably exponential decay. The acetylcholine is destroyed by the enzyme acetylcholinestarage. The noradrenaline is taken up back by the neuron, which has secreted it.
Calcium enters through the voltage-gate and triggers the release of transmitter.
" the entry of calcium through voltage-gated calcium channels causes synaptic vesicles to fuse with the presynaptic plasma membrane and release the neurotransmitter acetylcholine into the synaptic cleft. Acetylcholine diffuses across the cleft and binds to muscle acetylcholine receptors, causing depolarization and an action potential that travels throughout the length of the muscle cell triggering muscle contraction. "
How does the neuron moves a resting place to firing and then back to resting state?
The event in which a neuron's membrane potential rapidly rises from its resting potential and then falls back to its resting potential is called an action potential.
The neuron fires an action potential and returns to its resting state in the following manner:
Initially the resting potential of the inside of the cell membrane of a neuron with respect to the outside is about -70mV (this condition is referred to as polarized).
As neural signals from inputs at the dendrites of the neuron move down the dendrites and across the soma (cell body), they arrive at the beginning of the axon, called the axon hillock; those signals are comprised of quantities of sodium ions which have been pushed to the axon hillock by an influx of sodium ions through ligand-gated sodium ion channels (ion pores which open from the action of a chemical messenger neurotransmitters in a receptor portion of the ion gate) in the dendrites which have been opened by neurotransmitters released by a pre-synaptic neuron diffusing across the synaptic cleft into receptors at the dendrite.
Firing: If enough quantity of sodium ions reach the axon hillock to raise the membrane potential at that point to a threshold value of about -55mV(the trigger voltage), this is sufficient to open voltage-gated sodium ion pores in the initial segment of the axon, which allows more sodium ions in, raising the membrane voltage to from 50mV to 100mV (called depolarization), which cause nearby v-gated Na ion pores to open, which lets in more sodium ions, which open successive v-gated ion pores along the length of the axon. This moving (action) potential (voltage) is the neural impulse.
Returning to resting state: during the peak of the action potential, when the membrane potential is at it greatest, sodium pores begin to close, and potassium pores are opened, and since there is more potassium inside the cell than outside, potassium ions begin to leave the neuron through those channels; with the loss of these positively charged ions, the membrane voltage becomes more and more negative, opening more potassium pores, until the membrane voltage actually undershoots the resting potential momentarily. At this point the potassium pores begin to close, and the membrane potential rises back to the resting potential.
(please see the links below for additional explanations)
Where are located peripheral motor neuron cell bodies?
For spinal nerves, the general somatic efferent motor neurons have their cell bodies located in the ventral horn of the spinal cord (sometimes also called the anterior horn).
Some of your cranial nerves also have motor neurons located in various nuclei of the brainstem.
What is oculomotor synkinesis?
Oculomotor synkinesis is a condition that involves involuntary eye movements that occur simultaneously with intentional eye movements. This can result in abnormal eye coordination and difficulty focusing. It is often caused by nerve damage or injury.
Why are meiosis and mitosis confused?
Meiosis and mitosis are confused because iof the similarities in both the types of division.
The similarities between mitosis and meiosis is that in both types of cell division -
- the cells divide to form daughter cells
- DNA is replicated to form an extra set
- centrioles move to the opposite end of the cell and form spindle fibers between them
- the cell membrane, nucleolus and nuclear envelope all all break down
- the chromosomes line up in the center of the cell and each spindle fiber is attached to the center of the chromosome by their centromere
- the spindle fibres bring the chromatids to the opposite end of the cell
- in the ending phases of mitosis and meiosis the nuclear envelopes each contain half the amount of chromosome
- both the processes are a type of reproduction
