Anatomy and Physiology II

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Please study The Neural Tissue and Tha Spinal Cord, Spinal Nerves and Spinal Reflexes.
Please answer the following questions:
1.- Please explain the Nervous system division, and functions.
2.- What is the action of the acetilcholinesterase ?
3.- Which are the Nervous system cell types?
4.-Why the spinal nerves, are mixed nerves?