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Senses (sensory receptors monitor external & internal environment,…

- - - - changes in chemical concentration
      - temperature
      - stretching tissue
      - taste stimuli
    - - viscera pain
      - nausea
      - hunger
      - faintness
    - - lungs
      - digestive tube
      - bladder
  - - - tendons
      - joints
      - skeletal muscles
      - ligaments
  - - - respond to mechanical forces
        
        touch
        
        pressure
        
        stretch
        
        vibrations
      - baroreceptor
        
        monitors blood pressure
    - - respond to temperature changes
    - - respond to chemicals in solution and to changes in blood chemistry
    - - in the eye respond to light
      - THE EYE
        
        cones color vision
        
        rods allow light
        
        optic disc axons converge to form optic nerve
        
        blind spot
        
        posterior pole only cones, place of sharpest vision, center of macula lutea.
        
        posterior segment
        
        filled with vitreous humor, viscous liquid, transmits light, supports retina and lens, maintains normal pressure and shape of eye.
        
        optic disc raised disc on the retina
        
        retina contains cells that trigger nerve impulses
        
        vitreous humor gelatinous tissue filling eye posterior to lens
        
        choroid pigmented vascular area of eye
        
        sclera white part of eye surrounding cornea
        
        anterior segment
        
        filled with aqueous humor, transmit light, nourishes two parts the lens and the cornea, maintains pressure/shape.
        
        aqueous humor clear fluid between lens and retina
        
        cornea covers the iris, pupil & anterior chamber
        
        lens posterior to iris, focus light on retina
        
        iris posterior to the cornea, dilate or constrict to allow more/less light into the eye.
        
        pupil opening
    - - respond to harmful stimuli that result in pain