HNFE 2204 Lecture Notes - Lecture 9: Substantia Nigra, Medulla Oblongata, Spinal Nerve

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Every function in the body is controlled by the nervous system. There are more than 100 billion nerve cells in the body. Function of the nervous system: carry impulses between the brain and all other parts of the body, releases chemicals called neurotransmitters that are important in the transmission of nerve impulses, controls both voluntary and involuntary functions. Structure of the nervous system: central nervous system--responsible for things under voluntary control and well as involuntary control, brain. 75% water contains over 100 billion neurons four main divisions: the cerebrum, diencephalon, brainstem, and cerebellum. The brainstem contains the pons and medulla oblongata, and connects the brain to the spinal cord. It controls voluntary muscle contraction. autonomic nervous system carries impulses from the central nervous system to structures such as glands, membranes, and various involuntary muscles. Two parts: sympathetic system activates the body"s responses when activating, such as the fight or flight response, parasympathetic nervous system tries to maintain homeostasis.

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