BIOC32H3 Lecture Notes - Lecture 13: Withdrawal Reflex, Posterior Grey Column, Thalamus
2 Dec 2014
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Special senses (always conscious: vision, hearing, taste, smell, equilibrium (balance) Somatic senses: pain, itch, touch, temperature, proprioception (body position) ph, blood pressure. Activated by a stimulus (physical energy) e. g light waves (vision), sound waves (hearing) Stimulus activates sensory receptors: converts stimulus to intracellular signal signal transduction changes in membrane potential (vm) *note: membrane potential (vm) also known as generator or receptor potential (same as graded potential) If threshold is reached, there will be a conduction of action potential to the cns. There are generally three types of sensory by structure): free nerve ending, enclosed nerve ending, specialized receptor cell (hair cell) *note: listed by increasing complexity of receptors receptors (classified. Adequate stimulus- the form of energy to which that receptor is most responsive. *note: sensory receptors can respond to other forms of energy if stimulus intensity is high enough e. g photoreceptors responding to pressure. Receptive field- physical area where a stimuli falls within.
