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Summary Receptors.
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  • Course
  • Unit 5
  • Institution
  • OCR

Revision notes on receptors. A level biology OCR A revision notes. Notes on module 5: Communication, homeostasis and energy. Summary/ information you need to memorize for a level biology OCR A exams.

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Document information

  • December 4, 2023
  • 2
  • 2022/2023
  • Summary

Subjects

  • receptors
  • cell signalling
  • communication
  • homeostasis
  • energy
  • secondary messenger
  • primary messenger
  • steroid hormone
  • phospholipid bilayer
  • ocr a
  • biology
  • revision notes
  • a level
  • module 5

Written for

  • A/AS Level
  • OCR
  • Biology A
  • Unit 5
All documents for this subject (112)

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Receptors:


 Sensory receptors:
o Specialised cells that can detect changes in our
surroundings.
o They are specific to a single type of stimulus.
o They are energy transducers – they convert one form of
energy to electrical energy.


Receptor Location Sense Energy Form “Transduced”
to Electrical
Rods/Cones Retina Sight Light
Taste Buds Tongue Taste Chemical Potential
Olfactory Cells Nose Smell Chemical Potential
Pacinian Corpuscles Skin Touch Movement & Pressure
Meissner’s Corpuscles Skin Touch Movement & Pressure
Ruffini’s Endings Skin Temperature Heat
Proprioceptors Muscles Placement of Limbs Mechanical Displacement
(Body Awareness) (Stretching).
Hair Cells in Semi- Ear Balance Movement
circular Canals
Hair Cells in Cochlea Ear Hearing Sound


 The Pacinian Corpuscle:
o Mechanoreceptor found in the skin.
o Detects mechanical stimuli (pressure).
o The end of the sensory neurone is found in the centre of
the corpuscle.
o It is surrounded by layers of connective tissue called
lamellae.
o Each layer is separated by a layer of gel.

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