• There are 6 types of receptors:

- Proprioceptors

- Chemoreceptors

- Photoreceptors

- Mechanoreceptors

- Thermoreceptors

- Nociceptors

• A sense organ is a group of sensory receptors grouped together in a way to maximise the reception of a stimulus.

• All sense organs share basic features:

- Contain receptor cells that are particularly sensitive to one class of stimulus energies

- Usually respond to a retraced range of intensity

- The sensitive mechanism is localised at a specific location

- The sensory neurons in the receptor pass information directly to a sensory nerve which will carry that information directly to the brain.

• A sensory receptor will code for four aspects of a stimulus:

- Type (Modality): Only specific receptors will respond to specific stimuli

- Intensity: The receptors send info in different patterns to inform the brain of the intensity of the stimulus

- Location: Often determined by the location of the receptor in the body - eg. sound receptors in the ear

- Duration: determined by the firing sequences of the receptors

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Year 11 Unit 2