NVC BIOL 105 - The General and Special Senses (119 pages)

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The General and Special Senses



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The General and Special Senses

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Lecture Notes


Pages:
119
School:
Napa Valley College
Course:
Biol 105 - Human Biology
Human Biology Documents

Unformatted text preview:

Chapter 9 The General and Special Senses PowerPoint Lecture Slides prepared by Jason LaPres Lone Star College North Harris Copyright 2010 Pearson Education Inc Copyright 2010 Pearson Education Inc 9 1 Sensory receptors connect our internal and external environments with the nervous system Copyright 2010 Pearson Education Inc Sensory Receptors Specialized cells that monitor specific conditions in the body or external environment When stimulated a receptor passes information to the CNS in the form of action potentials along the axon of a sensory neuron Copyright 2010 Pearson Education Inc Sensory Receptors Sensation The arriving information from these senses Perception Conscious awareness of a sensation Copyright 2010 Pearson Education Inc Sensory Receptors The Detection of Stimuli Receptor sensitivity Each receptor has a characteristic sensitivity Receptive field Area is monitored by a single receptor cell The larger the receptive field the more difficult it is to localize a stimulus Copyright 2010 Pearson Education Inc Receptors and Receptive Fields Figure 9 1 Copyright 2010 Pearson Education Inc Sensory Receptors The Interpretation of Sensory Information Arriving stimulus Takes many forms physical force such as pressure dissolved chemical sound light Copyright 2010 Pearson Education Inc Sensory Receptors The Interpretation of Sensory Information Sensations Taste hearing equilibrium and vision provided by specialized receptor cells Communicate with sensory neurons across chemical synapses Copyright 2010 Pearson Education Inc Sensory Receptors Adaptation Reduction in sensitivity of a constant stimulus Your nervous system quickly adapts to stimuli that are painless and constant Copyright 2010 Pearson Education Inc Sensory Receptors General Senses Describe our sensitivity to Temperature Pain Touch Pressure Vibration Proprioception Copyright 2010 Pearson Education Inc Sensory Receptors Special Senses Olfaction smell Vision sight Gustation taste Equilibrium balance



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