Classification of Receptors: Complexity Simple receptors Usually a single modified dendrite General sense Touch, pressure, pain, vibration, temperature Complexity High modified dendrites, organized into complex structures ear, eye. Special senses Vision, hearing. smell taste
Classification of Receptors: Complexity • Simple receptors – Usually a single modified dendrite – General sense – Touch, pressure, pain, vibration, temperature • Complexity – High modified dendrites, organized into complex structures • ear, eye. – Special senses – Vision, hearing, smell, taste
Which receptor Receptors Cell membrane or Specialized cells or structures cytoplasmic receptor for the transduction of various proteins stimuli into electrical signals Central Peripheral receptors receptors Eyes(vision) Chemoreceptor(pH, gases, chemicals Osmoreceptor(osmolarity 像 Thermoreceptor(temperature) Ears(hearing equilibrium) Baroreceptor(pressure) Proprioceptor(body position) sme Other mechanoreceptors (pain, vibration, touch) Tongue(taste)
Which receptor?
Basic function Sequence of events in a receptor Stimulus Reception Receptor protein Activated Amplification Enzyme Cascade (in some cases) Receptor lon Channels opened (or closed) Receptor current Transduction Rece pt tor potenti Modulated transmitter Release from Receptor Cell Modulated Impuls Modulated Impulse Transmission Frequency in Second Frequency in Receptor Order neuron Cell Axon
Sequence of Events in a Receptor Stimulus Receptor Protein Activated Enzyme Cascade (in some cases) Receptor Ion Channels opened (or closed) Receptor Current Receptor Potential Modulated Impulse Frequency in Second Order Neuron Basic Function Reception Amplification Transduction Transmission Modulated Impulse Frequency in Receptor Cell Axon Modulated Transmitter Release from Receptor Cell
Part 2 Properties of the receptors Adequate stimulus · Transduction Adaptation Encoding
Part 2 Properties of the Receptors • Adequate Stimulus • Transduction • Adaptation • Encoding
1. Adequate Stimulus The type of stimulus the receptor is highly sensitive Receptor specially designed for one kind of stimulus The lowest threshold Insensitive to other stimulation
1. Adequate Stimulus • The type of stimulus the receptor is highly sensitive • Receptor: specially designed for one kind of stimulus – The lowest threshold – Insensitive to other stimulation