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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
Which sentence best describes integration in the nervous system?
Sensory receptors send signals to sensory neurons.
Is it true that to focus light muscles in the eye change the length and thickness of the retina?
No, to focus ligh, muscles in the eye change the length and thickness of the lens.
Bundles of tissue that carry signals from one place to another are called neurons?
yes that would be correct
How can a clam function with such a simple nervous system?
it has superatural abilites that make it swim very fast and the nervous sytem helps it eat better
What does the central nervous system consists of?
Of what does the central nervous system consist?
Use proper grammar...
What are the two division of the nervous system?
The 2 divisions of the nervous system are the central nervous system and the peripheral nervous system. Both systems have the main function of allowing communication from the brain to limbs and organs and back to the brain.
Can an injury to the Illioinguinal or Illiohypogastric Nerve cause an Acetabular Labral Tear?
say what?
What kind of nervous system do oysters have?
They don't have a central nervous system. Just 2 ganglia.
What is something unhealthy for nervous system and why?
Tetrodotoxin is a neurotoxin. It acts to neuronal depolarization and prevent subsequent action potentials via binding to the voltage gated sodium channels on the cell membrane.
In a healthy neuron, these voltage gated sodium channels are critical for generation of an action potential in response to graded depolarization (I.e. EPSP). As the neuron is depolarized, these channels open and allow for the influx of sodium ions into the cell, which in turn further depolarized the neuron in a positive feedback loop.
Tetrodotoxin (TTX) is the toxin found in blowfish (fugu).
Another harmful substance for the nervous system is manganese which causes manganism, resembling some aspects of Parkinson's disease.
Off the top of my head: 6-HO-dopamine, MPTP, ibotenic acid. Wikipedia these neurotoxins for their respective mechanisms of action
Source: degrees in neuroscience and neuropharmacology
no, the statement is false; in fact, the propagation of a neural signal in a myelinated axon is FASTER than in an axon which lacks a myelin sheath.
And the reason it's faster in a myelinated axon has to do with the fact that the myelin sheath is NOT a continuous covering on an axon, but rather a series of sections of wrappings around the axon separated by small gaps, like elongated beads on a string.
Wrappings of glia (oligodendrocytes in the brain, Schwann cells in the peripheral nervous system), which contain myelin, cover repeating sections of the axon and prevent any voltage gated ion pores under them from allowing more sodium ions into the axon at those places; but electrotonic conduction (basically the very fast electrostatic repulsive pushing of sodium ions under the wrap by the sodium ions which did enter the axon just before the myelin wrap) does occur, and although it weakens somewhat as it progresses, it's strong enough over the short distance of the wrappings to stimulate the voltage gated ion pores present in the succeeding gaps between the myelin wrappings to open and allow more sodium ions in, which re-strengthens the impulse as an action potential.
The result is that the neural impulse in a myelinated axon consists of a repeating series of action potentials in the gaps between myelin wraps, which are relatively slow to occur but replenish the strength of the impulse, and a similar repeating series of electrotonic conductions under the myelin wraps which occur faster than the action potential, such that the impulse reaches its final destination faster than it would as a pure action potential, but as strong at its destination as if it were just an action potential.
This impulse propagation by a combination of action potentials in the gaps and electrotonic conduction under the glia is called saltatory conduction.
What part of nervous system worked when you are pricked by a needle?
This is a reflex that the peripheral nervous system was involved in. The prick was noted by sensory neurons which carried information into the spinal cord and synapsed with motor neurons which made you react, most likely by pulling away.
Why auditory response is quicker than visual?
Because less neural processing is required and the nerve "circuitry" is much simpler for auditory input than for visual input.
How does a pythons circulatory system work?
The circulatory system of a python works like other non-reptilian animals in that the heart pumps the blood through the system. The python has only a three chambered heart, not a four chambered.
How nervous system affect your behavior elaborate?
Behavior is considered to be controlled mainly by the frontal lobes of the cerebrum. Another name for this part of the brain is the motor cortex. This is where all behavior and motor control originates; speech, thinking, moving the body, all our actions as well as our personalities.
receptors
Messages are transmitted from your spinal cord to muscles in your hands by the?
Peripheral nervous system:
Two infection of the nervous system include?
There are two infection of the nervous system. The two are known to be fungal and protozoal.
What condition caused by the over firing of neurons in the cerebral cortex?
fuzzy/hazy logic...
hyperactivity is another ter, that has been used before
What is the opposite of motor nerve?
A motor nerve falls under the category of efferent nerves, its opposite would be an afferent nerve, usually called a sensory nerve.
