BPK 205 Lecture Notes - Lecture 13: Sensory Neuron, Thermoreceptor, Membrane Potential

• School: Simon Fraser University
• Department: Biomedical Physio & Kines
• Course: BPK 205
• Professor: Nadine Wicks

Document Summary

Lecture 13 sensory physiology i: intro & somatic senses. Stimulus that reaches cerebral cortex = conscious = perceived stimuli. Stimulus that does not reach the cerebral cortex = unconscious = subconscious processing. Sensory receptor cells: convert a stimulus into an intracellular response, they may or may not be neurons. 4 main types of sensory receptors: 1) chemoreceptors = chemical signal, ex. ph, na+, o2, glucose. 1: 2) mechanoreceptors = mechanical changes/stimulus, ex. Pressure, vibration, gravity, acceleration, sound waves: 3) thermoreceptors = temperature, ex. Hot and cold: 4) photoreceptors = light signal, ex. Adequate stimulus = the form of energy to which the sensory receptor is most response: the receptor may respond (less strongly) to other forms of stimuli. Sensory transduction: stimulus -> results in change in membrane potential of the receptor. Neuronal receptor cells: fast and slow responses, myelinated neuron = fast response, ex. Fast, sharp pain when first stubbing toe: unmyelinated neurons = slow response, ex.