utv
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#1
Report Thread starter 2 years ago
#1
I am struggling to understand how many things are involved in a nervous response.

does one receptor detect a stimulus which generates a nerve impulses which travels along the sensory neurone then CNS then motor then one effector cell then a response or do many receptors detect a stimulus causing a nerve impulse which causes many cells to be stimulated?
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All Blunt
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#2
Report 2 years ago
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The number of receptors stimulated isn't of importance, you should think about it as a single type of receptor in a specific area. The receptor transmits an impulse down the sensory neurone, to the relay neurone and then to the motor neurone which stimulates an effector, i.e. a muscle or gland where a reaction happens. This is if it is a reflex action i.e. involuntary, this process is the reflex arc and happens before the impulse reaches the brain, ( although the impulse is not always transmitted to the brain, e.g. dilation of eyes wouldn't etc). If the reaction is voluntary then the impulse is transmitted to the brain before a reaction is started.
Last edited by All Blunt; 2 years ago
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