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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 is a large mass of nerves located in the skull?
The brain is a large mass composed of nerves that rests in the skull.
What part of the nervous system helps you to peel an apple?
Central nervous system (brain and spinal cord) and peripheral nerves.
Typically, hundreds of skeletal muscle fibers are innervated by a single motor neuron.Completed
How are proteins important in the nervous system?
The brain controls nervouse system ,brain needs protein to work better
The fans at the concert were almost louder than the music, and the light show was stunning. The whole experience was sensory overload. Sensory is an adjective.
How does the position of a worms nerve cord compare with your nerve cord?
an earthworm's nerve cord is directly opposite that of a human's. the earthworm's nerve cord is along the ventral side (underside) of its body and the human's nerve cord is on the dorsal side (upperside) of the body along all of the internal organs
Does the autonomic nervous system use a two efferent neuron chain or a two afferent chain?
two efferent neurons
Do both parasympathetic and sympathetic nervous systems operate with a chain of two motor neurons?
True
Poliomyelitis
What are the components of the nervous system?
The nervous system is composed of both central (brain and spinal cord) and peripheral components, with the latter having both somatic and autonomic (parasympathetic and sympathetic) subdivisions.
What three cranial nerves are involved in the cardinal positions of gaze?
vagus, glossopharyngeal and facial
How would a drug that stimulates acetylcholine receptors affect the sympathetic nervous system?
Preganglionic fibers for the SNS release ACh; so a drug that stimulates ACh receptors would stimulate the postganglionic fibers of sypathetic nerves, resulting in increased sympathetic activity
What is asynchronous motor unit?
The regulator that controls the speed at which the sexual organs produce ejaculation.
Why would a lack of neurotransmitter cause problem in the nervous system?
neurotransmitters are how signals move from neuron to neuron
What is the function of the peripheral nerves?
The main function of the peripheral nerves is to connect the central nervous system to the limbs and organs of the human body. It is the connection that communicates between the brain and the limbs and tells them when and how to move.
Is the Nervous systems is affected by Bell's palsy?
Very much so, but not severely. Bell's Palsy affects the 5th and 6th cranial nerves (trigeminal and facial, respectively), which, obviously, are part of the nervous system.
Does the Vagus nerve carry nerve impulses that decrease the heart rate?
The vagus nerve releases the neurotransmitter, aceytlcholine, that slows down the heart rate. It is not the nerve impulses per se that do this, rather it is the the release of transmitter and it's interaction with post-synaptic receptors that have this effect.
7 What are the evolutionary advantages achieved by the myelination of neurons?
Attack and escape. Myelinated neurons allow faster reflexes increasing chance of survival, which allows you to pass your genes on to your offspring.
What are the two subdivisions of the motor subdivision of the peripheral nervous system?
The two subdivisions of the motor subdivision are the somatic nervous system and the autonomic nervous system. The somatic nervous system transmits action potentials from the CNS to skeletal muscle, and the autonomic nervous system transmits action potentials from the CNS to smooth muscle, cardiac muscle, and glands.
The autonomic nervous system is divided into the sympathetic and parasympathetic systems.
How do the root nerve ramus plexus tract and ganglion relate to one another?
The root nerves originate from the spinal cord and branch into nerve rami, which combine to form plexuses—networked structures that distribute nerves to various body parts. These plexuses give rise to peripheral nerves that innervate muscles and organs. Ganglia are clusters of neuronal cell bodies located outside the central nervous system, serving as relay points for signals traveling along the tracts formed by these nerves. Together, these components facilitate communication between the central nervous system and the body's periphery.
