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Malfunction of the nervous system can occur as a result of genetic defects, physical damage due to trauma or toxicity, infection or simply of ageing.
The medical specialty of neurology studies disorders of the nervous system and looks for interventions that can prevent or treat them.
The sympathetic nervous system is activated in cases of emergencies to mobilize energy, while the parasympathetic nervous system is activated when organisms are in a relaxed state.
Nerves that transmit signals from the brain are called motor or efferent nerves, while those nerves that transmit information from the body to the CNS are called sensory or afferent.
They send these signals in the form of electrochemical waves traveling along thin fibers called axons, which cause chemicals called neurotransmitters to be released at junctions called synapses.
A cell that receives a synaptic signal from a neuron may be excited, inhibited, or otherwise modulated.
Thanks to Mark Steedman for supplying the dates for the adventures I didn't own when I originally compiled this list.
The nervous system is the part of an animal that coordinates its actions by transmitting signals to and from different parts of its body.