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LU10: NERVOUS SYSTEM (Types of Sensory Receptor (4. Chemoreceptor (General…

- - - - Central Nervous System (CNS)
        
        Consist of brain & spinal cord; receives sensory information from the PNS, performs integration & initiates motor command
      - Peripheral Nervous System (PNS)
        
        Consist of all the nerves that branched out from the CNS; Carries sensory information to the CNS, & sends motor command to the muscles & glands.
- - - - Parasympathetic Division: Promote responses that are associated with a relaxed state. Eg: causes the pupil to constrict & promotes digestion
      - Sympathetic Division: Promote responses that are associated with an activate state (crucial in fight or flight situation). Eg: inhibits digestion process & accelerates heartbeat
- - - - Covered by a white insulating layer: Myelin sheath (formed from membranes of tightly spiraled neuroglia)
      - Bundled together to form nerve fibers
- - - - Cone cell: account for colour vision in daylight
      - Helmeted gecko: Exceptional nocturnal vertebrate (have colour vision during the dusk hour) :arrow_right: due to lack of rod cells in their retina
      - Rod cell: sensitive to black & white vision at night
    - - Magnitoreception - iron-containing mineral magnetite in some of bird skulls.
      - Pit viper uses infrared receptor to detect body heat