BIO 181 Lecture Notes - Endocrine System, Parotid Gland, Sympathetic Nervous System

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Cell, tissue, and organ functions are regulated by control systems through negative & positive feedback mechanisms. Life is characterized by a high level of order & complexity. Coordinates numerous functions among tissues, organs, and organ systems through electrical impulses (analyze changes) Response to environmental stimuli (respond to changes) Works in coordination with the endocrine system. Brain and spinal cord form the central nervous system: communicates with other body tissues via the peripheral nervous system. Neurons receive information mostly via their dendrites: transmit information over their axons, function in networks. Afferent: usually sensory; convey information from sensory receptors to cns (e. g. pain receptors) Efferent: usually motor; convey information from cns to body (e. g. , stimulate glands to secrete and muscles to contract0. Somatic nervous system: conveys information from the cns to skeletal muscles, called voluntary nervous system because impulses are consciously controlled. Autonomic nervous system: provides automatic control of visceral organs (smooth muscles, cardiac muscles, glands)

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