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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 the nervous system triggered to respond to?
The nervous system is triggered to respond to stimuli.
What neuroglial cell is located in the peripheral nervous system?
Schwann cells and satellite cells are neuroglial cells located in the PNS
Why is the conduction of impulses slow in autonomic nervous system?
Because there is no need for a fast transmission, in most cases, of the chemical messengers (hormones). Therefore, the nerve cells are unmyelinated and send their signal in a continuous transmission.
What level of the central nervous system plays a role in influencing the autonomic nervous system?
cerebral cortex, hypothalamus, brainstem and basal nuclei
Massage can result in circulatory changes to the involuntary reflex responses of the?
autonomic nervous system
What is the distance across a nerve synapse?
The distance across a nerve synapse is 20 nanometres or 2x10-8 metres
This type of reflex never in fact reaches the brain. The reflex arc begins with the perception of temperature, moves to the peripheral spinal chord, and is immediately sent back into a muscular contraction to move the hand away.
What type of fiber is used for balance?
There are around 3500 inner hair cells which are found in the cochlea of the ear. They are attached to the basilar membrane and also embedded in a highly viscous fluid. When the angle of the head is altered this fluid exerts force dependent on the direction of gravity.
The embedded hair cells are therefore moved causing an influx of potassium ions from the endolymph and a resultant increase in the release of synaptic vesicles at the ribbon synapses. Due to the different orientations of the hair cells in the ear (from arrangement of cochlea) each movement of the head produces a unique combination of excited synapses (hair cells are only affected when bent in one direction).
This information is transported to the brain where decisions are made about the action the muscles need to take to restore the body's balance.
if you drop a pen and quickly try to catch it that would be a proper example of a reflex ,which is different from an arc reflex which is what happens when you hit your knee and it jerks
What kind of stimulus might cause a reponse from your autonomic system?
The autonomic nervous system is in charge of involuntary functions. There are two divisions-the sympathetic and parasympathetic. The sympathetic nervous system initiates the fight-or-flight response in emergency situations. The parasympathetic nervous system is referred to as the "rest and digest" stage in which the body "slows down" after the fight-or-flight response.
Does an amoeba have neurons present in it?
I would have to say no. A neuron is an electrically excitable cell that processes and transmits information by electrical and chemical signaling. Neurons are also vital characters in the nevous system. Nevous systems are unique to multi-cellular organism. Amoebas are single celled organisms and only function from one cell, therefore by definition of a "single cell-ed organism", amoebas can not contain neurons.
sense of position (Golgi tendon organ, muscle spindles, and joint receptors)
Which of the following divisions of the peripheral nervous system is voluntary?
The question is incomplete.
No options (for which of the following) are given to answer the question.
What happens to the shape of a neuron during ones lifetime?
i dont know that why i came here to find out but i guess no one knows ill keep looking then good luck
Does the dorsal cavity contain the structures of the nervous system?
The dorsal cavity contains the spinal cord, which is part of the central nervous system. Every body cavity contains some structures of the nervous system.
