1QQ#17 for 10:30 Correct the inaccurate statements. 1.Taste receptors cells produce action...
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Transcript of 1QQ#17 for 10:30 Correct the inaccurate statements. 1.Taste receptors cells produce action...
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1QQ#17 for 10:30Correct the inaccurate statements.
1. Taste receptors cells produce action potentials.2. The adequate stimulus for free nerve endings
surrounding a hair root is tissue damage.3. The intensity of a stimulus is proportional to the
amplitude of the action potentials it causes.4. At supra-threshold stimulus applied to center of
a receptive field of a first order sensory neuron will generate a higher frequency of action potentials than the same stimulus applied to the edge of that neuron’s receptive field.
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Convergence and two-point discrimination test
What about amount of overlap? How might that affect our ability to spatially resolve a stimulus?
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Fig. 07.08Receptive fields often overlap – how might the neural circuit enhance differences and thus spatial discrimination?
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Spatial discrimination is enhanced by lateral inhibition• Lateral inhibition involves near neighbors that inhibit each other• Lateral projections inhibit via NTs and IPSPs
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Fig. 07.11
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Relative timing of stimuli
• Receptors show different state of temporal adaptation (Shouldn’t that be “acclimation”, Dr Davis?)
• Tonic vs. phasic– Tonic receptors show little adaptation and continue to
transmit signals as long as there is a stimulus
– Phasic receptors show a high level of adaptation and will decrease their responsiveness to a steady stimulus
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Polymodal Sensory Neurons and Referred Pain
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Topographic maps
• The bizarre cases of people missing limbs and appendages?
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Muscle PhysiologyChapter 9
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Characteristics: Location, cell shape, nuclei per cell, innervation, connections to adjacent myofibers, arrangement of actin and myosin, regulation of cross bridges, sources of Ca++, response to injury, twitch duration, etc.
Different types of muscles for different tasks!
S 1