human phys lec 9

human phys lec 9 - Section2 Sensoryphysiology(somatosensory...

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Section 2 nsory physiology ( matosensory stem vision Sensory physiology (somatosensory system, vision, and olfaction) Cell and molecular physiology of muscle function ardiovascular physiology and neural control of Cardiovascular physiology and neural control of blood pressure and cardiac output.
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General principles of sensory physiology Somatosensory systems, vision, olfaction
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l t i i Environmental signal General steps in sensory processing g (energy) Light Mechanical mperat re Specialized accessory structures Sensory receptor cell* 1. 2. Temperature Chemical etc. 3. 4. Trains of action potentials in a specific nerve pathway (labeled lines) CNS structures processing Perception of type and intensity of environmental stimuli Steps 1, 2 and 3 may be in different cells or in the same cell.
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Characteristics of environmental stimuli nd their sensory receptor cells and their sensory receptor cells Stimuli . Factors in the environment that produce an effective response in a sensory receptor cell. Sensory transduction. Processes whereby a receptor cell converts the energy in a stimulus into a biochemical signal and/or a change in embrane potential that can then be transmitted to and interpreted by membrane potential that can then be transmitted to and interpreted by neurons. Adequate stimulus . Defined as the usual and appropriate stimulus for a particular receptor (e.g. photons of a certain wavelength, changes in air pressure, a chemical with certain properties, heat energy, etc.) abeled lines property f sensory ystems whereby activation of a Labeled lines . A property of sensory systems whereby activation of a receptor cell is perceived in a particular way regardless of how the cell is actually activated (i.e. a blow to the eye can be perceived as a flash of light).
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Sensory receptors provide information about external and internal events Somatic sensory systems Visceral sensory systems (on body surface) y y (on internal organs) Chemoreceptors (taste, smell, Chemoreceptors (chemicals, pH, pheromones) Thermoreceptors (temperature) Photoreceptors (vision, light gas content of blood, and other extracellular fluids) Baroreceptors (blood pressure) peception) Baroreceptors (sound, balance) Other mechanoreceptors (touch) Proprioreceptors (muscle stretch and tension) Other mechanoreceptors
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human phys lec 9 - Section2 Sensoryphysiology(somatosensory...

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