SensorysystemsPart1-four

SensorysystemsPart1-four - 45 Run ! Brain Sensory Systems...

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45 Sensory Systems Brain Legs Eat giraffe ! Run ! Sensory Cell “receptor cell” (modified neuron) 45 Sensory Cells and Transduction of Stimuli Sensory cells (also called “receptor cells” ) transduce physical or chemical stimuli into signals that are transmittable and interpretable. • Most sensory cells are modified neurons , specialized for detecting different kinds of stimuli, such as pressure, heat, or light.
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45 Sensory Cells and Transduction of Stimuli • Most sensory cells have membrane receptor proteins that detect a stimulus and respond by altering the flow of ions across the plasma membrane. Figure 45.1 Sensory Cell Membrane Receptor Proteins Respond to Stimuli Mechanoreceptor Chemoreceptor Light receptor 45 Sensory Cells and Transduction of Stimuli • Sensory cells transduce the energy from a stimulus into action potentials . • The first step is activation of a receptor protein in the plasma membrane of a sensory cell by a stimulus. • The activated protein opens or closes ion channels. 45 Sensory Cells and Transduction of Stimuli • The resulting change in membrane potential causes the sensory cell to fire action potentials or to change its secretion of a neurotransmitter onto an associated neuron that fires action potentials. • The intensity of the stimulus is encoded in the frequency of the action potentials produced.
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45 Sensory Cells and Transduction of Stimuli • Sensory cells and other types of cells form sensory organs , such as eyes, ears, and noses. Sensory systems
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This note was uploaded on 03/01/2009 for the course MCDB 1B taught by Professor Weimbs during the Spring '08 term at UCSB.

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SensorysystemsPart1-four - 45 Run ! Brain Sensory Systems...

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