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Compare and contrast the functions and characteristics of the endocrine system
 
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ANSWER:
There are several similarities between neurons and the endocrine system. Both secrete chemicals that are used for communication: Neurons secrete neurotransmitters, and the endocrine system secretes hormones. Some chemicals, such as adrenaline, act as both neurotransmitters and hormones. Both neurotransmitters and hormones have their own receptor sites.
There are also several differences between neurons and the endocrine system. Neurons secrete neurotransmitters into synapses, while the endocrine system secretes hormones into the bloodstream. Glands in the endocrine system can stimulate remote cells to which they have no direct connection, while neurons can stimulate only other neurons to which they have direct connections. The endocrine system produces its effects through chains of several hormones. In contrast, a group of neurons uses a characteristic neurotransmitter; for example, cholinergic neurons communicate by using acetylcholine.