UT Arlington BIOL 1334 - Lecture 10 - The Senses (40 pages)

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Lecture 10 - The Senses



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Lecture 10 - The Senses

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Pages:
40
School:
University of Texas at Arlington
Course:
Biol 1334 - Introduction to Biology Ii

Unformatted text preview:

Biology 003 Organisms in Their Environment Lecture 10 The Senses SENSORY RECEPTION Sensory organs share a common cellular basis All animal senses originate in sensory receptors specialized cells or neurons that are tuned to the conditions of the external world and the internal organs All sensory receptors trigger an action potential and send information to the central nervous system Sensory receptors convert stimulus energy to action potentials Sensory receptors detect stimuli In a process called sensory transduction receptors detect one type of signal the stimulus and convert the signal to another type an electrical signal Sensory receptors convert stimulus energy to action potentials When you eat ice cream 1 sugar molecules enter the taste bud 2 sugar molecules bind to sweet receptors specific protein molecules embedded in a taste bud 3 binding triggers a signal transduction pathway some ion channels in the membrane close and others open 4 changes in the flow of ions creates a receptor potential 5 release of neurotransmitters initiates an action potential Figure 29 2A Sugar molecule Taste pore 1 Taste bud Sensory receptor cells Sensory neuron Sweet receptor 2 Sugar molecule stimulus Membrane of a sensory receptor cell Signal transduction pathway 3 Ion channels 4 Sensory receptor cell Ion Receptor potential 5 Neurotransmitter Sensory neuron mV Action potential to the brain 6 No sugar Sugar present Rates of action potentials Sensory receptors convert stimulus energy to action potentials The stronger the stimulus the more neurotransmitter released by the receptor cell the more frequently the sensory neuron transmits action potentials to the brain Figure 29 2B Sugar interneuron Salt interneuron Sugar receptor cell Salt receptor cell Brain Taste bud Sensory neurons No sugar Increasing sweetness Taste bud No salt Increasing saltiness Specialized sensory receptors detect five categories of stimuli There are five categories of sensory receptors 1 Pain receptors detect



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