Acetylcholine is the neurotransmitter that <em>allows the contraction of all skeletal or voluntary muscles, it also plays a role in learning,</em> memory, attention, and arousal. This means that for the example given, it is contacting muscle fibers in your leg for you to move and it will also stimulate your learning process.
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There are many differences and similarities between the two routes. The type of goods is just one example. The benefactors of the Silk Road, whereas the Indian Ocean route benefited the Chinese, Indian and Middle East alike.
