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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
What kind of fibers are found in spinal nerves?
An axon is a nerve fibre, "a single process extending from the cell body of a neurone and carrying nerve impulses away from it".
A nerve bundle is made up of hundreds or thousands of axons. A good factsheet can be found at www.ivy-rose.co.uk/Topics/Neurons.htm
The cranial nerve responsible for chewing is?
Trigeminal V: a mixed nerve responsible for the chewing of food and sensations in the face, scalp, and teeth and the contraction of chewing muscles.
What are the factors involved in the transmission of a nerve impulse?
action potational. volage change, threshold etc
How does the circulatory affect the nervous system?
the blood in your circulatory system is connected to your brain there for it is also connected to your nerves because most of your body has nerves that will tell your brain is something is wrong.
What nervous center controls the internal organs?
The brain is the part of the peripheral nervous system that controls glandular activity and the muscles of the internal organs.
How many nerve cells make up the nervous system?
Only one but there are several divisions of it such as central vs peripheral or sympathetic vs parasympathetic nervous system. It's all one but different ways of dividing it up to make sense of it.
Is the sympathetic or parasympathetic involved in pupillary response?
the sympathetic nervous system (SNS) is a very important part of the autonomic nervous system. the SNS is well known for its role in the fight-or-flight response in the body. among the effects it has are: bronchodilation, increased heart rate, increased metabolism and dilated (increased diameter) pupils. the reason why pupils become dilated during SNS activity is because dilated pupils allow more light to enter the eye and it also increases the visual field - remember this is a fight-or-flight response, our responses to perceived threats are heightened and our senses are really alert.
the parasympathetic system on the other hand functions in time of rest and digestion. the PNS is therefore most active during our relaxed states.
sympathetic.
What is a group of drugs that slow down the nervous system?
There are many drugs that can slow down the body but they don't come into affect immediately
What is the difference between spinal column and vertebral column?
because during the growth of human beings the vertebral column outgrows the spinal chord. that's why we don't find the spinal cord starting from lower lumbar region where lumbar puncture is done.
Are the lungs part of nervous system?
No. It is part of both the respiratory and circulatory system. The parts of the Nervous System are:
Brain:
-Cerebrum
-Cerebellum
-Brain Stem
Neurons:
-Sensory Neuron
-Interneuron
-Motor Neuron
Spinal Cord
What happens if the sensory nerve is cut?
Cutting the optic nerve would lead to loss of vision in the affected eye.Damage to either optic tract would lead to loss of HALF the vision in in either eye (due to the crossing over of tracts in the optic chiasm). so you would loose half the visual field in either eye. (neoroscience student).
What is the autonomic nervous system divided into?
I believe it's sympathetic and parasympathetic. Sympathetic is like the spark plug and gets the body revved up, the parasympathetic is like the brakes and slows the body down. That's how I learned it. Hope it's right. lol
What are the four major elements of a simple nervous pathway?
Sensory receptor, afferent neuron, efferent neuron, effector organ.
Why do you say that the nervous system the control center of the human body?
Because the nervous system is what controls all the various tissues of the human body, without it pretty much nothing would occur in the body. You wouldn't pick up any "information" from your external or internal environment and so wouldn't learn. It also consists of motor neurons which send signals to our muscle cells to contract(our cells perform there functions under the regulation of the nervous system). Practically none of the things your body does, from the vasodilation of blood vessels in the skin, in response to changes in temperature or the secretion of hormones such as adrenalin, to the contraction of bicep muscles to lift a weight wouldn't occur without it.(although some muscles are myogenic and don't require nervous impulses in order to conract, such as the heart muscles, the rate of contraction etc are still controlled by the nervous system. In short EVERYTHING is controlled by the nervous system! and that's why it's called the control centre of the body.
The nervous system is considered the control center for the body because it is responsible for all functions of the body. The nervous system is what sends messages to your organs function and it also tells you limbs when and how to move.
Cutting the ventral root of a spinal nerve will denervate all target organs that receive efferent innervation from that spinal nerve.
Spinal nerves are made by the joining of dorsal and ventral roots of a spinal cord segment. Dorsal roots generally carry sensory information, while ventral roots generally carry motor innervation. Another way to say this is that dorsal roots carry information from the periphery to the central nervous system (CNS) in an afferent direction, while ventral roots carry information from the CNS to the periphery in an efferentdirection. Afferent information is generally sensory in nature, while efferent information includes signals to trigger muscular contraction as well as gland secretion, hormone synthesis, etc.
What is the medical term meaning any disease of the nervous system?
Neuroarthropathy is the medical term meaning any disease of nerve and joint.
Does Synthetic drugs affect the nervous system?
All psychotropic drugs affect the nervous system, from marijuana to dipropyltryptamine or methamphetamine. This is how they work, if they didn't affect the nervous system (particularly the brain) then no one would feel an effect.
Which cranial nerve is the largest in diameter?
The X craneal nerve (vagus), it goes all the way to your diafragm
What are the Symptoms of ailments of respiratory system?
1.colds
2.laryngitis
3.pharyngitis
4.tonsilitis
5.bronchitis
6.bronchial asthma
7.pneumonia
8.tuberculosis
9.emphysema
10.lung cancer
What part of the nervous system gets you ready to run a race?
The nervous system relies on signals from the brain to help us run.
