Lec. Notes week 14
Lec. Notes week 14 BIOL 203L 003
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This 2 page Class Notes was uploaded by DeForest Williamson on Saturday October 17, 2015. The Class Notes belongs to BIOL 203L 003 at Purdue University taught by in Summer 2015. Since its upload, it has received 19 views. For similar materials see Ecology and Evolution Laboratory in Biological Sciences at Purdue University.
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Date Created: 10/17/15
Lec 14 Notes Neurophysiology Ill Introduction Sensory neurons provide our bodies with information from our surrounding environment Specialized sensory neurons include 1 Nerve cellsphotoreceptors of the eyehair cellsolfactory cells of the nose 2 Nerve endings naked endings and respond to pain or encapsulated in pacinian corpuscle 3 Epithelial cellstaste cells on the tonguegt these are nonneuronal Somatic Senses vs Special Senses invove receptors in the skin muscles The five senses details about these later tendons joints and visceral organs 1 Exteroceptive senseschanges on the body surface from light pressure etc 2 Proprioceptive senses have to do with the body s position as well as it s movement Ex muscle lengthtension equilibrium etc 3 Visceroceptiveinteroceptive senseschanges in the body s internal environment Ex Blood pressure Types of Stimulus Photoreceptorsgt light Chemoreceptorsgtchemicas Ex Changes in pH metabolite concentrations etc Mechanoreceptorsgtrespond when deformed by mechanical forces Receptors for sound and balance in the ear also involved with these Thermoreceptorsgt warmthcold Nociceptorsgtpain receptors Specifically tissue damage provides stimulus Definitions 0 Transduction the receptor in a cell converts some of the stimulus energy into an electrical signal that provides information for the nervous system 0 Thresholdminima level of excitement required for a nerve receptor to be excited 0 General Potentialweak stimulus that initiates a depolarization below threshold 0 Frequency codethe frequency of action potentials increases as the stimuli intensity increases Objectives H are all pretty well covered in the intro so the bulk of the notes are started with Objective IV Objective IV Threshold In order to excite a receptor it has to have its specific corresponding stimulus as well as intensestrong enough to activate a threshold response for that receptor The electrical change in the receptor is typically caused by open sodium channels When general potentials are increased past the threshold point they trigger a multitude of action potentials Action potentials increase as the stimulus level increases Refer to pg 286 in the lecture notes to see a clear diagram Objective V Stimulus QualityType The brain interprets the type of stimulus it is receiving touch sound light based on the receptor s reaction Eyes determine if we see light touch determines pressure etc This concept is known as the labelled line code Objective VI Receptor Adaptation After repeated stimulation receptors eventually adapt In other words the frequency of action potentials gradually decreases Pacinian corpuscles are examples of receptors that are very adept at rapidly adapting Diagram on pg 288 in the Lec Notes Objective VII Rate of Nerve Impulse Conduction
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