Class notes
Biol 102 Sensory Mechanisms Lecture Notes
- Course
- BIOL 102
- Institution
- Liberty University
This is a comprehensive and detailed note on Chapter 12;Sensory Mechanisms for Biol 102. *Essential Study Material!!
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Sensory Mechanisms: Chapter 12,Lecture 32
Receptors Receive and Convert Stimuli
Stimulus: sensory input that causes some change within or
outside the body
– Heat, pressure, sound waves, light, chemicals
Receptor: structure that detects stimulus and
converts its energy into another form
Different kinds of receptors
– Mechanoreceptor – Thermoreceptor – Pain receptor
– Chemoreceptor
– Photoreceptor
1. Receptors Are Classified according to Stimulus
Mechanoreceptors
– Respond to mechanical energy (sound waves change
in fluid pressure, stretching, gravity)
Thermoreceptors
– Respond to heat or cold
Pain receptors
– Respond to tissue damage or excessive heat or
pressure (tissue damage, excessive pressure and temperature)
, Receptors Are Classified according to Stimulus
Chemoreceptors
– Respond to presence of chemicals
Photoreceptors – Respond to light
CNS Interprets Nerve Impulses Based on Origin and
Frequency
Nerve impulses are transmitted from receptors to specific
portions of brain
Stronger stimuli
1. Activate a greater number of receptors
2. Trigger a greater frequency of action potentials in sensory
neurons
1. Some Receptors Adapt to Continuing Stimuli
Some Inputs are Ignored Sensory adaptation
o – Sensor neuron stops sending impulses even though the
original stimulus is still present
o – Allows the CNS to concentrate on important stimuli and
ignore noncritical ones to maintain homeostasis
Receptors that adapt
– Light touch, pressure, and smell receptors
Receptors that do not adapt
– Pain, joint, and muscle monitoring receptors
Somatic Sensations and Special Senses Provide Sensory
Information
Somatic sensations
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