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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
A plexus (from the Latin plectere,
meaning "braid") is an interwoven network of spinal nerves. There are four major plexuses on each side of the body: 1) the cervical plexus innervates the muscles of the neck, the skin of the neck, the back of the head, and the diaphragm muscle; 2) the brachial
plexus innervates the shoulder and upper limb; 3) the lumbar plexus innervates the muscles and skin of the abdominal wall; and 4) the sacral plexus innervates the buttocks and lower limbs. The nerves then divide into smaller branches.
Where do nerve impulses from the brain move to?
No there are many local loops. This is particularly true in the digestive system where the peristaltic contractions have many within gut circuits.
Sodium is a positive ion. As it enters the cell the sodium influx raises the membrane potential (voltage) in that area. By doing this at many different stages along the axon one after the other, this positive current flows down the axon as an action potential, transferring nerve impulses from one neurone to the other.
i dont no
Where on a neuron does an impulse start and end?
the impulse starts at the dendrites which is located near the cell body and ends at the synaptic terminals which are at the end of the axon.
How many cranial nerves carry both sensory and motor impulses?
Five cranial nerves are mixed or sensorimotor nerves:
- Trigeminal Nerve (V)
- Facial Nerve (VII)
- Glossopharyngeal Nerve (IX)
- Vagus Nerve (X)
- Accessory Nerve (XI)
Axon diameter increases noticeably at the nodes of ranvier What purpose does this serve?
the axonal diameter increases due to the myelin wraped tightly around the axon.
Do injections get rid of pinched nerves?
Nothing gets rid of a pinched nerve except surgery. Injections can ameliorate the pain but not fix the problem.
This is a very complex question. Essentially nerves transmit signals by maintaining a resting potential of -70mV across the cell membrane by keeping large molecular anions (negatively charged molecules) in the cell and actively transporting sodium (Na2+) out of the neurone (the nerve cell). When the neurone is stimulated by some neurotransmitter such as acetylcholine the receptor opens up Na2+ gateways in the membrane allowing Na2+ ions to enter the neuron partially de-polarising the neurone. If enough of these receptors are activated and gateways opened then depolarisation reaches a threshold level.
At this point voltage gated ion channel in the membrane open allowing Na2+ ions to rush in depolarising the call to around +30mV at which point voltage gated K+ ion channels open allowing these to rush out repolarising the cell. The cell then enters a brief refractory period where it will nolonger depolarise, this acts as a means to control signalling. The depolarisation occurs in a wave down the axon of the neurone. As the action potential reaches the synaptic knob of the axon voltage gated ion channels allow Ca2+ to enter. This causes exocytosis of neurotranmitters contained in vesicles into the synaptic cleft. These neurotransmitteres then attach to receptors the postsynaptic membrane and depending on whether the neurotransmitter is excitory such as acetylcholine or inhibitory like dopamine will allow sodium ions to enter depolaizing the call if excitory. Inhibitory neurotransmitters hyperpolaise the cell and prevent the neurone 'fireing'
What are the functions of the axon terminal button?
The terminal buttons are located at the end of the neuron and are responsible for sending the signal on to other neurons. At the end of the terminal button is a gap known as asynapse. Neurotransmitters are used to carry the signal across the synapse to other neurons.
What is the function of cyton in a neuron?
Cyton has a large,central nucleus surrouded by the cytoplasm.
What are two classifications of sensory receptors?
There are many different sensory receptors, but olfactory receptors in the nose, and cones and rods in the eyes are two specific types of sensory receptors. Olfactory detects the chemical presence and your brain identifies it as a smell. The rods and cones of the eye process light and color to form images that your brain processes as vision.
What specific effects does caffeine have on other neurons?
If too much caffeine is in your system, there can be a temporary impulse on the other neurons. This sudden impulse will momentarily wake up your brain but will damage some neurons. The neurons may get aggravated and cause them to shake violently. This friction could cause the neurons to join together with another neuron which would cause an oxypartifamine reaction. That means that the neuron will merge and could cause serious brain problems. If experiencing brain problems, one should immedietely consult a doctor for further advice.
DO NOT WASTE TIME
GO SEE A DOCTOR
Which component has a role in the post synaptic cell during synaptic activity?
Chemically Gated Channels.
Where can a neuron be stimulated?
The cell membrane becomes more permeable to the sodium potassium ions.
Which organ regulates the pituitary gland?
The hypothalamus in the brain regulates the pituitary gland.
