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WARM UP 1. Explain what parts of the nervous system represent the cell, tissue, and organ levels of organization. 2. Draw a neuron and label as many parts as you can. WARM UP 1. Give an example of each of the following from the nervous system: – A cell – A tissue – An organ 2. How do neurons work together to signal your arm to move when you touch a hot stove? Nerve Pathways General Pathway • Stimulus received/sensed by sensory neurons General Pathway • Message processed by interneurons – Brain (integrated thought) – Spinal cord (reflex arc) General Pathway • Response sent through motor neurons Divisions of the Nervous System • Central – Brain and spinal cord Divisions of the Nervous System • Peripheral – Cranial and spinal nerves – All other nerves Divisions of the Nervous System • Peripheral – Somatic • Conscious control – Autonomic • Internal organs Divisions of the Nervous System – Autonomic • Parasympathetic : “Housekeeping” tasks • Sympathetic : Control in times of heightened stimuli Sensory Pathways • Detect stimuli • Notify brain and spinal cord • Use many types of receptors… Sensory Pathways • Chemoreceptors – Chemicals • Senses of taste and smell Sensory Pathways • Mechanoreceptors – Pressure • Sense of touch and hearing Sensory Pathways • Photoreceptors – Light • Sense of sight Sensory Pathways • Thermoreceptors – Heat • Sense of touch Sensory Pathways • Nociceptors – Pain WRAP UP • List the 5 kinds of receptors and what they do.