41. Sensory Receptorsrename
yaboiemil's version from 2016-01-14 14:10
Summary1. Sensory receptors can receive and perceive information.
2. Sensory receptors can be basic Free Nerve Endings (terminal branch of a nerve ending between 2 cells,
where they end is the innervation area, mostly detect pain)
3. Sensory receptors can be more complex Sensory Corpuscules (sensory nerve fibre is encapsulated
in differentiated tissue, could be sensory cells to help detect specific modalities)
Types of Sensory ReceptorBe sure to learn at least these, so that no one can catch you off-guard and make you look foolish.
|Mechanoreceptors||Receptor that responds to mechanical stimuli (touch/sound)|
|Thermoreceptors||Receptor of heat/temperature change|
|Chemoreceptors||Receptor of Chemical signals/molecules|
|Photoreceptors||Receptor of Light|
|Teloreceptors||Detect stimuli from distant sources|
|Exteroreceptors||Detect stimuli that directly make contact with receptor|
|Proprioreceptors||Inform the body of passive movement of limbs|
|Interorreceptors||In internal organs, initiate pain to maintain stable environment|
4. Receptor cells have common features: Outer segment (finger-like) AND Inner Segment (filled with mitochondria).
5. When stimulus occurs, (e.g. an ion channel is opened) cations flood in, causing a Receptor Potential.
6. The influx of Cations (like K+) enter outer segment, flow to inner segment.
|Modality||A particular form of sensory perception (e.g. smell, taste, sight)|
|Adequate Stimulus||The type of energy a sensory receptor responds to|
|Projection Law||If a nerve is irritated at a point from periphery>brain, the sensation is projected to the relevant receptor|
|Adaptation||If a stimulus intensity is maintained for a long period, irritability decreases|
|Receptor Potential||a local change in the resting membrane potential, the triggers the action potential|
|Weber-Fechner Law||proposed relationship between magnitude of a physical stimulus and intensity/strength that people feel|
Weber - Fechner Law
PRACTICE WRITING OUT THIS EQUATION