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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
Numerous nerve impulses arriving at a synapse at closely timed intervals exert a cumulative effect?
temporal summation
How is a severed nerve similar to an electrical cord that has been cut?
A cut electrical cord looses the ability to transfer the flow of electricity. The same is true of a severed nerve; it no longer can transmit messages.
How does information travel between neurons?
By the migration of a potential charge.
When a neuron gets stressed (stretch receptors) or receives a signal (a neurotransmitter) it can either cause a positive or negative change in that neurons membrane potential. If the change is POSITIVE enough, and lets in enough Na+ through ligand gated ion channels (where the neurotransmitters bind) , then the cell will be able to fire. Fireing means that a bunch of voltage gated ion channels open to allow more Na+ in, in a chain reaction fashion. As the channel detects a positive change in voltage, it opens its channel to allow even more positive ions to enter the cell. After the Na+ channels open, K+ channels open to let out K+, to help restore the resting potential of about -60. The Na/K pump will help to re-establish the correct resting potential after this chain reaction has moved all the way down the cells axon. The meyelin sheath helps these reactions "jump" down the axon, and therefore makes it faster and more efficient. When the reaction reaches the end terminal of the neuron Ca+ is used instead of Na+, Ca+ has an unusual affect on vesicles, making them want to leave the cell, contained in these vesicles are neurtransmitters, which go to a new cell and the process starts all over again.
Using Cl- instead of Na+ at the ligand gated ion channels in the dendrites will make the cell more negative and harder to depolarize and trigger the voltage gatted Na+ channels. Certain neurotransmitters bind to these Cl channels and different ones bind to the Na+ channels.
What neurotransmitter is found at the synapse between nerves and human skeletal muscle cells?
Acetylcholine is the neurotransmitter at the neuromuscular junction.
What neurons are affected in primary lateral sclerosis?
PLS affects a part of the neuron called the cell body (or soma). Specifically, it is the cell bodies of upper motor neurons that are affected.
Which cranial nerve is damaged due to a medial strabismus injury?
Medial strabismus is caused by cranial nerve damage. There is no such thing as a medial strabismus injury that causes a nerve to be damaged, rather the damaged nerve causes strabismus. A strabismus refers to the misalignment of the eyes or a deviation in gaze. A medial strabismus would be the result of damage to the abducens nerve (cranial nerve VI). CNVI innervates the lateral rectus muscle of the eye, which pulls the eye laterally. Therefore, if this nerve is damaged, the eye is no longer able to pull laterally, and the tonus of the medial rectus muscle acts unopposed. This pulls the eye medially, causing medial strabismus.
If it hasn't been too long, you should take the neurontin as soon as you realize you missed your dose. If it's closer to the time you normally take it, you should wait until your next dose is due.
Do axons carry messages received by the dendrites to other neurons?
Yes! The axon carries messages received by the dendrites to other neurons.
What important organ is in the nervous system?
The brain is the most important organ of the nervous system. The spinal cord and the brain are the main parts of the nervous system but the spinal cord is not considered to be an organ.
A Strectched nerve is pretty much what it sounds like. A nerve being stretched. Apparently there is something called "nerve stretching", that's therapudic in some way, but im referring to the result of surgery, on an injury.
I had was in a car accident that caused me to shatter my pelvic bone, and when I had surgery on it, They stretched a nerve which now causes me ridiculous pain in my foot. The pain in a way is good, because it means I have feeling in my foot, whereas if I were to completely sever the nerve There would be none. But because I strecthed it, The feeling is still coming back and in a very painful way. 6 months is the expected time for it to heal completely.
I hope I answered your question.
What neurons form the afferent division of the PNS?
For CH 12 of A&P the correct answer is: Sensory Neurons.
What do neurons have to do with emotions?
Neurons are the active cells of the nervous system. They are used for all cognitive, sense, and manipulatory activities, not just emotions.
Where is the nervous system at in the body?
The nervous system hasn't a defined location, it is distributed in the entire body. Every tiny point of your skin has a nerve that sends a signal to your brain telling that you are feeling pain, heat.. The internal organs of your body also have nerves.
The nervous system is constituted of two main parts : The central nervous system and the peripheral nervous system. The central nervous system contains the brain and spinal cord. The peripheral nervous system consists of nerves, (nerves are long fibers that connect the central nervous system to every other part of the body), the motor neurons, the autonomic nervous system,(comprising the sympathetic nervous system and the parasympathetic nervous system, and the enteric nervous system) which mediates voluntary movements.
