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Sensory Information (Receptor Potential (Generation methods…

- - - - Deformation stretches receptors, ion channels open
    - - application of chemical on surface opens ion channels
    - - Changes permeability of membrane
    - - Changes the membrane characteristics and ion channel status in membrane
  - - - The increased number of stimulation leads to increased action potential
- - - - Viscoelastic core
        
        Force applied to one side is instantly transmitted to the core and receptor potential is changed
        
        However, fluid within corpuscle rapidly redistributes
        
        Pressure equalises in all parts of structure, receptor potential no longer triggered
        
        When force is removed, processed reversed - rapid expansion distorts central core changing the potential until redistribution occurs and pressure equalises, no more stimulus
        
        The disturbance of the central core signals the onset and offset of the stimulus
    - - Only activate when the change is taking place; ie when stimulus strength changes
        
        The excitation ceases rapidly despite the stimulus still being present
    - - Also known as rate/phasic receptors
    - - Understanding the rate of bodily changes
        
        Allows body to predict body states ahead of time
        
        Make corrective changes necessary
      - Runner turning around a curve
        
        Hair cells in semicircular canals detect the rate of head turning
        
        Runner knows how much he will turn, adjust position of limbs to maintain balance
  - - - Accomodation in the terminal nerve fibril
    - - CNS always aware of the status of muscle contraction and load of each muscle tendon in real time
- - - - Detect mechanical deformation in the receptor or adjacent cells
    - - Detect changes in temperature :fire: :snowflake:
    - - Detect damage in tissues, physical or chemical
    - - Detect light in the retina of eye
    - - Detects changes of O2 and CO2 in body
      - Taste and smell
      - Osmolarity of body fluids
  - - - Highly sensitive to a SINGLE type of stimuli
      - Almost or unresponsive to normal intensities of all other types of stimuli
    - - Only carries sensory information for ONE specific modality of sensation
    - - Neurons of a specific pathway lead to and terminate in a specific point of CNS
        
        Determines the type of stimulation felt
- - - - Precise location of stimulus
      - Shape and texture of indenting object
      - High density - two point discrimination
    - - Vibration
      - Stretching of skin
      - Pressure of the object
      - Low density
        
        One point discrimination
  - - - Increased action potential (Increased stimulus)
      - Lateral inhibition causes the neurons with receptive fields along the edges to be strongly inhibited