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- Acethylcholine :
- Neurotransmitter of the central and peripheral nervous system especially involved in muscle contraction and attention. 
- Adrenaline (or epinephrine) :
- A neurotransmitter secreted in response to stress or related to the preparation of physical activity. 
- Afferent nerve :
- A bundle of nerve fibres (neurons) carry nerve impulses from sensory receptors (periphery) to the central nervous system. 
 
											