10 Organisms Sense their Environment - 10 Organisms Sense...

10 Organisms Sense their Environment
 3 categories of Receptors and Function
o Mechanoreceptors
 Touch
 Hearing (special sense)
 Balance (special sense)
o Chemoreceptors
 Taste (special sense)
 Smell (special sense)
 pH
o Electromagnetic receptors
 Vision (special sense)
 Conveying sensory information
o Stimulation
o Transduction-energy is converted
o Transition-potentials are translated to action potentials
o Interpretation-brain forms perception of stimulus
 Sensory Transduction and Transmission
o Receptor receives info from the stimulus its sensitive to.
o Receptor potential is gated-larger stimulus larger the depolarization
o Stimulus gated ion channels
o If threshold is reached the action potential will be formed
o Large stimulus produces a large receptor potential which results in frequent action
potential
 Mechanoreceptors
o Nociceptors
 Pain-receptors detect tissue damage are stimulated
 Noxious substances and tissue damage
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