This system of loosely connected neurons (primarily in the central core of the brain stem) helps to keep the cerebral cortex alert while filtering out excess stimuli: Group of answer choices Endocrine Autonomic System Reticular Activating System (RAS) Limbic System NMDA Receptors     This major part of the brain acts as a switch and relay center, directing incoming sensory information to the proper part of the cerebral cortex: Group of answer choices cerebellum - vermis cerebrum - white matter brain stem - pons diencephalon - thalamus     The part of the brain that helps with the timing and patterns of skeletal muscle movement, allowing Angela to walk smoothly into the room: Group of answer choices spinal cord cerebellum cerebrum brain stem diencephalon

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