physiology chapter 5 peripheal nervous system

physiology chapter 5 peripheal nervous system - Chapter 6...

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Chapter 6 The Peripheral Nervous System: Afferent Division; Special Senses
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Peripheral Nervous System Consists of nerve fibers that carry information between the CNS and other parts of the body _________ division Sends information from internal and external environment to CNS _________ afferent ( usually subconscious) Incoming pathway for information from internal viscera (organs in body cavities) _________ afferent (conscious) Somatic (body sense) sensation » Sensation arising from body surface (pain, touch, temperature) and proprioception (what is this?) Special senses » Name 4 special senses…
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Perception Conscious interpretation of external world derived from sensory input Why sensory input does not give true reality perception Humans have receptors that detect only a limited number of existing energy forms Cerebral cortex further manipulates the data
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Receptors Structures at peripheral endings of afferent neurons Detect a ________ (change detectable by the body) Convert forms of energy into electrical signals (called what?) Process is called _________ ________ stimulus: the stimulus to which a receptor responds most readily http://learn.genetics.utah.edu/features/clockgenes/images/rodsandcones.gif
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Types of Receptors _______ receptors Responsive to visible wavelengths of light _______ receptors Sensitive to pulling and stretch _______ receptors Sensitive to hot and cold _______ receptors Detect changes in concentration of solutes in body fluids and resultant changes in tonicity _______ receptors Sensitive to specific chemicals Include receptors for smell and taste and receptors that detect O 2 and CO 2 concentrations in blood and chemical content of digestive tract _______ ceptors pain receptors that are sensitive to tissue damage or distortion of tissue
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Receptors __________ alters receptor’s permeability (what does this mean?) This change in membrane permeability  can lead to the influx of ______ions.   This produces  receptor potentials   (graded potential or action  potential?) The magnitude of the receptor potential  depends on the intensity of the  stimulus. A receptor potential of sufficient  magnitude (that is, greater than  _________ membrane potential) can  produce an  action potential .  This  action potential is propagated along an  afferent fiber to the CNS.  (Would we  want dust to stimulate action  potentials?)
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Conversion of receptor potential into action potentials. What types of gates? A receptor potential is what type of potential? The stronger the stimulus, the greater the ________ potential.
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Receptors Adaptation decrease in frequency of action potentials in response to sustained stimulus Receptors may adapt slowly or rapidly ______ receptors Do not adapt at all or adapt slowly
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