Biol 216 7 Senses 1-32.pdf - Powerpoint 7 Cochlea from the...

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5/20/17 1 Powerpoint 7 Cochlea from the inner ear 5/22/17 1 Learning Goals 1. Classify, describe the function of, and compare and contrast, the differentkinds of sensory receptors (eg: mechanoreceptors, chemoreceptors, nociceptors, proprioceptors,photoreceptors, thermoreceptors, golgi tendon organs,etc) 2. Explain the anatomical components, the detailed processes, and the molecular basis of balance, hearing, vision, olfaction and gustation. 5/22/17 2
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5/20/17 2 Special Senses Special senses : have receptors strategically placed in unique organs: Hearing and balance Olfaction Taste (gustation) Visual system 5/22/17 Sensory receptors Formed by terminals of afferent neurons or by specialized cellsthat synapse with afferent neurons Function: to gather information about the external and internal environment 5/22/17 4
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5/20/17 3 Types of Neurons A. Motor Neuron B. In cerebral cortex and hippocampus C. In cerebellum D. In Retina E. Carry information from skin and muscle 5/22/17 5 Sensory Receptors Respond to stimuli (such as light, heat, chemicals, mechanical stress) by changing their conductance to ions (such as Na+, K+, Ca+) This results in a change in membrane potential Brain processes signals into sensory sensations Sensory transduction : Conversion of a stimulus to a change in membrane potential 5/22/17 6
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5/20/17 4 Sensory receptor formed by dendrites of an afferent neuron Stimulus Stimulus opens gated ion channels Action potential In sensory receptors formed by the terminals of afferent neurons, a stimulus causes a change in membrane potential that generates action potentials in the axon of the neuron. Temperature and pain receptors are among the receptors of this type. Afferent neuron (to CNS) 5/22/17 7 Sensory receptor formed by a cell that synapses with an afferent neuron Stimulus Sensory receptor cell or structure Action potential In sensory receptors consisting of separate cells, a stimulus causes a change in membrane potential that releases a neurotransmitter from the cell. The neuro-transmitter triggers an action potential in the axon of a nearby afferent neuron. Mechanoreceptors, photoreceptors, and chemoreceptors are examples of receptors of this type. Diffusion of neurotransmitter or first messenger Neurotransmitter or first messenger opens gated ion channels 5/22/17 8
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5/20/17 5 Two main types of sensoryreceptors 5/22/17 9 Hair cells are involved in hearing and balance For Example : 5/22/17 10
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5/20/17 6 Types of Receptors 5 basic types
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  • BarbaraKuemerle

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