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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 are the steps involved in the life cycle of a neurotransmitter?
1. 1. Synthesized (made)
2. 2. Stored/ packaged in synaptic vesicles
3. 3. Transported down to the presynaptic end of the neuron
4. Released into the synapse
5. 5. Binds to receptors of postsynaptic neuron
6. 6. Comes loose from receptor
7. 7. Inactivated
a. Destruction
b. Reuptake- the major way to inactivate a neurotransmitter;
SSRI -Selective serotonin reuptake inhibitors
What cranial nerve is not in involved in either taste or smell?
Optic Nerve = Vision
Oculomotor Nerve = Eye movement; pupil constriction
Trochlear Nerve = Eye movement
Trigeminal Nerve = Somatosensory information (touch, pain) from the face and head; muscles for chewing.
Abducens Nerve = Eye Movement
Vestibulocochlear Nerve = Hearing; balance
Vagus Nerve = Sensory, motor and autonomic functions of viscera (glands, digestion, heart rate)
Spinal Accessory Nerve = Controls muscles used in head movement.
Hypoglossal Nerve = Controls muscles of tongue
Golgi tendon organ
The correct sequence of parts that function to carry cardiac impulses is?
S-A node, A-V node, A-V bundle, Purkinje fibers
What is The depolarization and repolarization of a neuron membrane called?
This process is called nerve conduction.
What part of the nervous system responds to stimuli?
The parts of the nervous system that respond to stimuli are called the sensory nervous system. This includes touch, pressure, hot and cold, sound, light, and taste.
Do the bulbous ends of the axons of neurons cling to capillaries?
No, the bulbous ends of astrocytes cling to capillaries.
What is the ailments of nervous system?
* Epilepsy-is a disorder of the brain.People with Epilepsy suffers regular comulsion. * Meningitis-is an inflamation of mengis or the covering of the brain and spinal cord cause by a viruses or bacterias and it may cause DEATH. * Cererbral palsy-cause by damage to the brain that happens due to premature birth or accident. * Brain tumor-a person with brain tumor feels severe headache and it can be removed by operation when detected early. * Polio-cause by a viral infection wich destroys the motor nerves in the spinal cord,manifested by fever,headache,muscle ache,runny nose and paralysis and it can be controlled by immunization. * Encipalities-is known as the sleeping sickness cause by a germ that makes to be very sleepy or drawsy all the time. * Paralysis-is ability to move a part of a body due to nerve of muscle damage. * Quadriphegia-is a paralysis of the body from the neck down. * Paraplegia-is the paralysis of the lower body and leg. * Bell's palsy-inflamation of the nerve. * Poliomyelitis-paralisys of the legs,arms and other parts of the body. * Parkinson's disease-is a disease of the brain characterized by tremor annd muscle stiffens. * Spasm-is a cramp or sudden involuntary muscular contraction. * Shingles-is an acute infection of a particular neres and known as the "HERPESS ZOSTER". _-BY SCIENCE ADVISED-_
Why curare reduces the response to nerve stimulation?
Curare reduces the response to nerve stimulation because it acts as a neuro-muscular blocking agent, or muscle relaxant. It is also known as tubocurarine.
How your nervous system responds to harm?
The receptor cells in your body or muscles detect the effect and then it sends an electrical signal to the brain which then sends back a signal to the effector which is a muscle to activate a movement. This is called the 'Reflex Arc' and it includes more complex thing s that is not mentioned in here as this is a simplified piece of information.
What do electrical changes in a neuron create?
In neurons especially, and in all cells to a degree, electrical charges are moved across the plasma membrane via ion channels and pumps to establish an electrical gradient. The strength of this gradient is determined by how ion channels are opened.
At the dendrite side of the neuron, inputs from other neurons cause the membrane to lose some of its charge separation, to depolarize. This change in voltage, a graded potential, only affects a small area of the neuron and doesn't travel. However, if this graded potential is strong enough that it can reach the axon hillock, it can start to open voltage-gated ion channels, which are found all along the long axon, but especially at the hillock. If enough ion channels are opened at the hillock, then this depolarization will open other voltage-gated ion channels in a chain reaction. This can then open up the voltage-gated ion channels next to it, and so on down the axon. This wave of depolarization is called an "action potential." This signal can then travel long distances and affect other neurons.
How is the frequency of a sound indicated to the nervous system?
movement of the perilymph in the cochlear duct
Which cranial nerve transmits hearing and equilibrium information to the brain?
vestibulocochlear nerve (VIII)
How does the nervous system respond to stimuli?
They FIRE, when a SUFFICIENT stimulus is received.
A neuron can receive a stimulus from a SENSORY INPUT, or from ANOTHER NEURON.
When a SENSORY NEURON is stimulated by some physical event, such as touch, sound, light, etc, sensory receptors on the neurons cell membrane translate the physical stimulus into electrical impulses by causing changes in the balance or proportions of electrically charged IONS.
When a neuron is stimulated by ANOTHER NEURON, the stimulating neuron (or, "pre-synaptic" neuron) has released NEUROTRANSMITTER chemicals into the space between the two neurons (the SYNAPSE), as a consequence of its own activation (firing); the neurotransmitters then bind to receptors on the post-synaptic neuron, usually on a DENDRITE, causing Sodium ion pores to open, which allow Sodium ions to enter the neuron which has now been "stimulated". These Sodium ions then electrostatically "bump" other Sodium ions, which bump others, etc, along the dendrites and cell body (soma), in a process called ELECTROTONIC CONDUCTION, which has the property of happening quickly, but looses strength as it moves along. When this impulse reaches the beginning of the neurons AXON, at a location called the AXON HILLOCK, this impulse is summed or added with any other similar impulses, and if it reaches a THRESHOLD value, it will cause the axon to FIRE, which means that a slightly different (but still ionically electrical) neural impulse will be generated along the axon, called an ACTION POTENTIAL.
And the original answer to this question was:
Neurons send vital messages to the brain so it can decide what to do.
How do you treat the nervous system disease?
Rehab is the best way to treat a nervous system disease. It is the way to free the body from tensions.
Why do you want to avoid hitting the sciatic nerve when giving an injection in the buttocks?
Hitting the sciatic nerve when giving an injection in the buttocks can lead to permanent pain radiating from the buttock on that side down the back of the thigh. Sciatica pain can be debilitating! It can lead to problems and pain with just taking a few steps.
How do you keep your neurons system healthy?
to make you neurons system healthy eat food that good to u, like veges and fruits, eat right amount food for you. Don't smoke and don't drink alcohol.
Which statement accurately describes the nervous system - ApEx?
WRONG - It works just like a battery
maybe correct? - It is electrochemical.
Why do i get nervous and shaky when i get called on in class?
Feeling nervous and shaky when called on in class is a common reaction rooted in anxiety and the fear of judgment. This response can be triggered by the pressure to perform well, concerns about speaking in front of peers, or a lack of confidence in your knowledge. Physiologically, your body may respond with a fight-or-flight response, leading to symptoms like shaking or increased heart rate. Practicing relaxation techniques or preparing in advance can help mitigate these feelings.
What is a motor unit is made up of?
Motor neurons and the muscle fibers they transmit signals to
A motor unit is a collection of muscle fibers that contract as a single functional unit when stimulated by an impulse from a motor neuron. The actual size can vary greatly, from many large muscle fibers in the quadriceps muscle group per motor unit to just a few muscle fibers in the muscles of the fingers per motor unit.
