BIOL 1050H Chapter Notes - Chapter 12: Schwann Cell, Tetanus, The Delay

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Two organ systems dedicated to maintaining internal coordination. Endocrine system: communicates by means of chemical messengers (hormones) secreted into the blood. Nervous system: employs electrical and chemical means to send messages very quickly from cell to cell. Sense organs receive information and transmit to cns. Cns commands muscles and cells to carry out response. Central nervous system (cns): consists of brain and spinal cord. Peripheral nervous system (pns): consists of everything else (nerves and ganglia). Nerve: bundle of nerve fibers (axons) wrapped in connective tissue in the brain, that carry signals to and from organs. Ganglion: knot-like swelling in a nerve where the cell bodies of neurons are concentrated. Pns further divided into sensory and motor divisions which are both further divided into somatic and visceral subdivisions. Sensory (afferent) division: carries signals from various receptors to the cns. Somatic sensory division: carries signals from receptors in the skin, muscles, bones and joints.

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