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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
How the maintenance of a polarized state in a resting nerve is provided?
Maintenance of a polarized state of a resting nerve is achieved through continuous expenditure of energy.
What is the function of the vasomotor center?
vasomotor centre is under medullary control and is responsible for vasoconstriction /vasodilatation so that blood pressure is maintained.
How do you get rid of a pinched nerve from the foot?
You should first see a doctor to confirm you truly have a pinched nerve in your foot. if it is a pinched nerve, avoid all strenuous activity until the pain subsides. Often, taping or bandaging the foot for a few days will take care of the problem.
What region of a neuron would have significant numbers of voltage-gated ion channels?
These are found along the axon and at the synapse. Voltage-gated ion channels directionally propagate electrical signals in one direction.
What is the chemical substance that transmits nerve impulses across a synapse?
Melination
The myelin sheath means that the action potential can occur in between the schwann cells. Myelinated meurones conduct much quicker that non-myleinated neurones, even at speeds upto 120m/s
What is one of the most common causes of damage to the nervous system?
Physical injury is one of the most common causes of damage to the nervous system.
Vesicle are not fusing with the membrane and releasing neurotransmitter.
Why is the medulla important to the body?
The medulla is so important to the body because it controls vital autonomic functions, actions that we can't control. It controls functions such as breathing, heart rate, blood vessel diameter, etc.
What best indicated the pathway that nerve impulses travel in a simple reflex?
A simple reflex travels in this order:
- Stimulus
2. Sensory Reception
This is when the body senses the stimulus through receptors located all over the body. Some receptors are clustered to form our major sensory organs (i.e., taste buds on tongue).
3. Central Nervous System
Sensory neurons transmit the signal to the CNS (brain and spinal cord) through peripheral nerves that connect from the body's extremities to the CNS.
If this simple reflex is part of a simple reflex arc (a stimulus that produces some reflexive response), the brain then sends instructions through a motor neuron to an effector (usually a muscle or gland). This prompts either muscle movement or chemical action.
What is the rapid change in membrane's potential caused by the deplariztion of a neuron?
action potential
Can you have nausea with nerves?
Defiantly. If something hurts your nerves or any part of you, it can make you nauseas.
What is the different of neuron to an odinary cells?
A neuron is a fundamental cell of the nervous tissue which receives and maufactures information and generates and transmits responses and cells are composed of several different compounds (water, carbohydrates, proteins etc.) which combine to forma cell. In conclusion, a neuron basically belongs to the nervous tissue while ordinary cells generally belong to the blood tissue.
a relay neuron is the neuron that picks up the message from the sensory neuron and delivers it to the motor neuron in the spinal cord or the brain
It would be unusual for veins to die any earlier than the organism in which they exist, although veins certainly are susceptible to a variety of illnesses. Intravenous drug users often cause their veins to collapse. In the elderly, veins can become excessively enlarged, a condition called varicose veins.
No, nerves do not send signals. They transmit signals produced by receptors or the brain or spinal cord.
When under what conditions will a local depolarization not lead to the action potential?
If ion pumps open to hyperpolarize the neuron (chloride ions flowing into the neuron) elsewhere, leading to a net polarization/hyperpolarization, then the action potential will not be created.In order for the AP to be induced, a NET depolarization (influx of cations) must be created above the membrane threshold.
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