0
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
What determines whether a neuron will have an action potential triggered?
The effect upon the target neuron is determined not by the source neuron or by the neurotransmitter, but by the type of receptor that is activated. A neurotransmitter can be thought of as a key, and a receptor as a lock: the same type of key can here be used to open many different types of locks. Receptors can be classified broadly as excitatory(causing an increase in firing rate),inhibitory(causing a decrease in firing rate), or modulatory(causing long-lasting effects not directly related to firing rate).
Ions flow into the neuron. An action potential forms moves along the neuron. A response occurs, here, an aversion response... your body pulls your hand and finger away.
Can you briefly describe the events that occur when a nerve impulse arrived at a synapse?
A synapse is a junction where two nerves meets. when action potential reaches a synapse, the pores open allowing an afflux of calcium ions into presynaptic terminal. this causes neuro transmitters to be released and cross over the synaptic cleft to attach to receptors in the post synaptic membrane and allow impulse to pass.
Spinal nerves from the sacral region?
sacrum...Now if you're looking for the sacral region of the spinal cord it originates from upper portions on lumbar vertebrae and extends via cauda equina to exit as it did emryologically
What causes muscle spasms after surgery?
This can be caused by the fact that a surgeon just cut through muscles, ligaments, tendons etc. in your back to get to whatever he/she was specifically repairing. Also, after surgery you are often bed-ridden for a while, and inactivity is a major cause of back pain. Give your back time to heal, try to get active again (based on your doctors recommendations) and if the pain never seems to go away then go back to your doctor/surgeon for further advice.
Why is the nervous system important to you in school?
It is important to study the nervous system in psychology because certain behaviors and mental conditions stem from a known characteristic in the nervous system. Some people suffering from disorders such as Alzheimer's have related neural characteristics.
What is the job of his motor neurons?
controls muscles
Relay messages from the Brain in the CNS down through the Spinal Cord and into the PNS, from there the motor neuron synapses on muscle fibers. i.e. knee jerk reflex & the neuromuscular junction.
What is the space between 2 neurons where electrical and chemical signals jump from neuron neuron?
It's a 'bridge' where the neurotransmitters jump from one neuron to the other. It is called synapse.
This is a simple notion that I have about this subject. For a complete review involving this part of the brain and how it works see the link to "Neuron" below.
Surgical debridement (also known as sharp debridement) uses a scalpel, scissors, or other instrument to cut dead tissue from a wound. It is the quickest and most efficient method of debridement.
The Peripheral Nervous system (PNS) includes all the neural tissue outside the Central Nervous system (CNS). The PNS delivers sensory information to the CNS and carries motor commands to peripheral tissues and systems. Bundles of axons, or nerve fibers, carry the sensory information and motor commands in the PNS. Such bundles, with associated blood vessels and connective tissue, are called peripheral nerves, or simply nerves.
A whitish cord-like structure composed of one or more bundles (fascicles) of myelinated or unmyelinated nerve fibers, or more often mixtures of both, coursing outside the central nervous system, together with connective tissue within the fascicle and around the neurolemma of individual nerve fibers (endoneurium), around each fascicle (perineurium), and around the entire nerve and its nourishing blood vessels (epineurium), by which stimuli are transmitted from the central nervous system to a part of the body or the reverse. Nerve branches are given in the definition of the major nerve; many are also listed and defined under branch.
Why is a neuron called an interneuron?
A neuron is called a inter-neuron because that specific neuron takes impulse from one neuron to a next neuron. For example your sensory neuron sends a impulse that you had felt a hot object. It goes through the spine to a inter-neuron to a motor neuron (this processes is called a reflex). Then the motor neuron tells your muscles in your hand to move
Why is the resting potential value of a membrane negative?
The resting membrane potential is the difference between the inside of the cell relative to the outside. The outside is always taken as 0mv. The resting membrane potential is negative because there is a higher concentration of potassium ions outside the cell (because the membrane is more permeable to potassium ions) than inside. Since potassium ions are positively charged this leads to a negative value.
How nerve signals are transmitted at a synapse?
An electrical charge is spread through your body... The brain sends an electrical current to the point of the nerve to tell the body of the event...
What neuron has the capacity for regeneration?
Motor neurons have the capacity to regenerate as long as the Schwann cells remain intact
What may happen if the nerves that control the muscle are injured?
Depends on what kind of nerve damage and how severe is it
If it is partial motor nerve then you feel
weakness
Total loss of motor nerve then you cant move that muscle and it will have no muscle tone
if it is sensory nerve then you will have altered sensations
total loss of sensory nerve then you wont feel a thing ...
Why can't nerves be transplanted?
Nerves can be and are transplanted. There was just a mother who gave two nerves to her son so that he could have sensations in his hands after an accident. It is a relatively new field, but such transplants happen.
What functional advantages a neuron with several have over a neuron with only one dendrite?
These are also called multipolar neurons and they allow for the integration of a great deal of information from other neurons.
