PSYCH481 Lecture Notes - Excitatory Postsynaptic Potential, Axon Terminal, Peripheral Nervous System

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Contains 10 billion 100 billion nerve cells and about as many helper cells. Nerve cells differ in shape, size, and chemicals they produce. Nerve cells organized into modules (clusters of nerve cells that communicate with each other) that are connected through neural circuits to other modules that communicate with each other. Peirre flourens suggested different parts of nervous system were responsible for different functions but conflicting evidence now some functions more spread out. Donald hebb (50 years ago) provided better understanding by showing that nerve cells are organized into larger units functioning could be understood by individual cells and larger networks they comprised. Brain controls behaviour, processes and retains information we receive from environment, and regulates body"s physiological processes. Receives information from body"s sensory receptors and is connected with muscles and glands of body. Central nervous system brain and spinal cord. Spinal cord long, thin collection of nerve cells attached to base of brain and running length of spinal collumn.

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