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Nervous System
This category is for questions about the mechanical and chemical process of reactions to internal and external stimuli, ranging from the brain down to the spinal cord, and all nerves, cells and tissues in between.
3,047 Questions
The two anatomical divisions of the nervous system are the?
Central and Peripheral nervous system.. further divided into sensory, motor and autonomic(sympathetic and parasympathetic)
Why - because we're not magical. If there isn't a nerve then there isn't any sensation (or motion/control).
Biggest example of no connection is the brain itself ... it can NOT feel itself.
Another cute example is calluses - they insulate the nervous system from the outside world.
For even weirder results ... check out the blind spot (which you can't see, and you can't tell that you can't see).
What could cause numbness in your right quadricep?
Pressure on one of the nerves. Maybe a pinched nerve. If it has been going on a more than a few days, I would consult a doctor.
Chemical substances in the nervous system that are similar in structure and action to opiates and are involved in pain control, pleasure, and memory are called endorphins. They act as natural painkillers by binding to opioid receptors in the brain and spinal cord, helping to reduce pain sensations and promote feelings of well-being.
Can you run 480 volt motors in a 380 volt system?
Can I run 480 volt , 60 HZ motor at a 380 volt , 60 Hz system?
When nerve cells in the nervous system cease to divide they are in what stage?
When nerve cells in the nervous system cease to divide, they are in the G0 stage of the cell cycle. This is a quiescent phase where the cells are not actively dividing but are still functioning.
Do speakers of Guugu Yimithirr have a heightened sensory system of magnetotactic bacteria?
I'd sortof doubt it, as their terms of cardinal reference are rotated slightly clockwise from magnetic compass directions. If they did, I'd think they'd be spot on, unless skewed by heavy local iron deposits?
Information taken from an article titled:
Guugu Yimithirr Cardinal Directions
JOHN B. HAVILAND
published in
Ethos
26(1) (March 1998), pp. 25-47
("Moreover, the GY system is rotated slightly clockwise from standard Western compass directions, possibly reflecting the line of the coast, prevailing winds, or the seasonal arc of the sun.)"
What is reaction time when driving?
The definition of reaction time, in terms of driving, is how long it takes you to react to an emergency: by hitting the brakes, turning the wheel, etc.
For most people, this time is approximately 1 second, which at a speed of 60 mph is about 90 feet. So if the emergency occurs within that distance, you probably won't have had time to avoid the accident.
Many insurance companies, however, use a much stricter standard of 1.5 seconds (135 feet), this being (on average) the amount of time it takes to recognize an emergency, decide upon an action, and then execute it.
This is one reason why you're supposed to keep a minimum of four car lengths (2 seconds) between you and the car you're following while at freeway speeds.
A neural signal is received at a neuron when neurotransmitters released by a pre-synaptic neuron diffuse across the synaptic cleft and settle in to receptor sites on ligand-gated sodium ion pores typically located on the dendrites or dendritic spines of the post-synaptic neuron.
As the ligand-gated pores open, sodium ions enter the neuron, and their electric fields repel one another down the dendrite and across the soma (body of the neuron), by a process known as electrotonic conduction. This is considered a graded response, because it can vary from small to large values.
If enough sodium ions pile up at the end of the soma where the axon begins (the axon hillock), by a summation of either multiple or fast inputs, yielding a voltage above the trigger voltage, it will trigger the opening of voltage-gated sodium ion pores in the initial segmentof the axon.
As sodium ions pour into the axon through the v-gated ion pores, they open nearby v-gated sodium ion pores, more sodium ions come in, more v-gated ion pores open, and this process continues down the length of the axon in a process known as the action potential.
When the action potential reaches the ends of the axon, the axon terminals, the voltage causes voltage-gated calcium ion pores to open, allowing calcium ions into the axon terminals, which instigate a biochemical process to occur which causes small sacs (called vesicles) containing messenger chemicals called neurotransmitters to be moved into contact with the cell membrane, where they fuse with the membraneand release their contents into the synaptic cleft.
The heart is innervated by vagal and sympathetic fibers. The right vagus nerve primarily innervates the SA node, whereas the left vagus innervates the AV node; however, there can be significant overlap in the anatomical distribution. Atrial muscle is also innervated by vagal efferents, whereas the ventricular myocardium is only sparsely innervated by vagal efferents. Sympathetic efferent nerves are present throughout the atria (especially in the SA node) and ventricles, including the conduction system of the heart.
What parts of a neuron is capable of generating a graded potential?
The dendrites portion of a neuron will generate a potential.
If the inside of the neuron is negatively charged compared to the outside the neuron is in the?
If it's approximately -70 mV, then it's in a resting state.
What part of nervous system transmit message?
Impulses in the cell body (soma) of a neuron and move on along its axon, which conducts the impulse to a synapse at the end of the axon. There neurotransmitters are released into the synaptic cleft, so that the impulse can stop or go on to the next neuron or a gland/motor end plate, depending on the kind of neurotransmitter. Different types of neurotransmitters are: acetylcholine, adrenaline, noradrenaline, serotonine.
What type of message allows one neuron to communicate with another neuron?
There are two main ways Neurons communicate to each other:
1) via chemical messengers
2) via electrical potentials
The main form of communication via neurons to neurons in a chemical messenger so I will explain this one.
An example of a chemical messenger is when one neuron releases glutamate from its axon. Glutamate is an neurotransmitter (NT) created in our body, it's purpose is to excite the neuron it is received by.
So for instance ( and this is a very general example this is not how pain works completely I just made up this example to demonstrate how the communication happens. ) lets say you touch a hot stove. An interneuron in your spinal cord receives the pain signals. How can it communicate to the brain neurons you are in pain? Well the interneuron can release the glutamate from it's axon, and then NT glutamate will travel to neuron b who has receptors for glutamate. When the glutamate binds to neurone b's receptors, neuron b will become excited.
Why are cranial nerves numbered by roman numerals?
This is straight from my text book. So here it goes...
The 12 pairs of cranial nerves are indicated by Roman numerals (I-XII) from anterior to poster (front to back).
Hope this was helpful =D
How do you interpret the system of tolerancing?
In order to interpret the system of tolerancing, one must understand that this system is used when designing items that have several parts, and it's these parts that will need a bit of tolerance when assembled in order to work together correctly. If tolerances are too little or too much, the pieces on't fit together correctly, or will not function correctly once the entire item has been assembled.
How do you paralyze your hand?
Well the way to make your hands sort of fall asleep is to hold someones arm tight for about 30 seconds then make sure your hand stays in the same position. Take your hands off the persons arm and then make the person run their fingers gently over your hands (make sure that your hands are still in the same position). Now try and move your hands (bet you can't).
TIP YOU NEED TO KNOW!!! : To be able to move your hands again you need to ask someone to slap your hands.
Based on the main neurotransmitters the sympathetic nervous system can be classified as what?
The sympathetic nervous system can be classified as adrenergic, based on the main neurotransmitters used.
An automatic leveling system is a suspension system which automatically adjusts front and rear ride heights to compensate for changes in axle load.
Do the vagus nerve increase heart rate?
it decreased heart rate , since vagus nerve innervate parasympathetic never and we know parasympathetic nerve reduce heart rate.
How does central nervous system get affect?
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