Increasing the amplitude of a stimulus increases...
The frequency of action potentials of the afferent fibres
A particular form of sensory perception
Give the classifications of receptors according to: Receptor
Give the classifications of receptors according to: Localisation of stimulus
Give the classifications of receptors according to: Form of energy of the stimulus
Give the classifications of receptors according to: Type of perception (modality)
Give the classifications of receptors according to: Adaptation
- Fast (Dynamic/phasic)
- Slow (Tonic/static)
Stimulus elicits a direct conformational change to the channels of the neuron
Stimulus is sensed by the second cell of sensation, cation channels then open
E.g sound reception: 1. hair cell, 2. auditory nerve
Afferent nerve fibre belongs to only the third cell involved in stimulus transduction
E.g 1. Rods + cones, 2. Bipolar cells, 3 Ganglion cells
Give the types of receptor
- Free nerve ending
- Pacinian corpuscle
- Golgi tendon organ
Give an example of an exteroceptor
Pain/temperature receptors of the skin
Member of the exteroceptors functioning by no free nerve endings
Golgi tendon organ location
- Found at the border of the tendon and muscle
Why are receptors also known as transducers?
Mechanical stimulus may evoke an electric response
Generator potential is conducted with...
Decrement/possible information loss
Information that has been transformed
- Travels at a high speed
- Frequency coded manner
Give the temp/AP frequency relationship
Title the figure
Skin temp. and AP frequency in various fibres
Heat is sensed by what kind of system?
Dual receptor system
- Warm receptors (receptive between 30-45°C)
- Cold receptors (receptive between 15-42°C)
- 2x more cold receptors than warm
What is unique about olfaction?
- Fast adaptation to stimuli
- High differential threshold
- Difficulty in locating the source
What are the receptor cells of the olfactory mucosa?
The only primary receptor cells of higher organisms
Describe the receptors of the olfactory mucosa
Receptor cells project cilia into the mucous layer
What are the thinnest nerve fibres of the body?
Myelinated axons leaving the olfactory mucosa
Primary olfactory neuron