CAS BI 315 Chapter Notes - Chapter 7.1-7.5: Afferent Nerve Fiber, Receptive Field, Lateral Inhibition
Document Summary
Sensory system sensory receptors receive stimuli neural pathways conducti info brain/spinal. Perception awareness of sensation; occurs after processing in cns. Transduction stimulus energy graded potentials action potentials (afferent) Sensory receptors peripheral ends of afferent neurons; stimuli graded potentials action potentials. Can be specialized cells or end of afferent cells. Adequate stimulus type of stimulus receptor responds to when functioning normally; receptors. Sensory receptors can be activated by large non-adequate stimulus (poking your eye may respond best to certain adequate stimuli (ie, different wavelengths of light in your eye) stars) Receptor gives rise to only on sensation membrane potential. Mechanoreceptors mechanical stimuli; alter permeability of ion channels change in. Chemoreceptors binding of chemicals; blood ph, smell, taste, etc. Nociceptors pain due to actual/potential tissue damage; activated by variety of stimuli. Transduction: opening/closing of ion channels membrane potential graded potential ( receptor potential ) As long as receptor potential keeps afferent neuron depolarized action potentials continuously propagate.