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Questions and Answers
What is the main function of nociceptors?
Which type of receptors are hyperpolarized upon stimulation?
What is the main function of Pacinian corpuscles?
Which ions do the channels opened during generator potential typically admit?
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In the context of sensory receptors, what is the relationship between the rate of impulse discharge and the log intensity of the stimulus based on Weber Fechner Law?
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How does an increase in stimulus intensity affect the rate of discharge from sensory receptors according to the text?
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How do receptors compress marked changes in stimulus intensity into smaller changes in frequency of action potential?
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What is the maximal amplitude of receptor potential mentioned in the text?
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Which of the following statements about generator potential is FALSE based on the text?
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What happens if the receptor potential reaches the firing level of the afferent nerve according to the text?
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Which statement is TRUE regarding the conduction of generator potential based on the information provided?
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Study Notes
Nociceptors
- Primary function is to detect and transmit pain signals, alerting the body to harmful stimuli.
Hyperpolarization
- Inhibitory receptors are hyperpolarized upon stimulation, dampening neuronal excitability.
Pacinian Corpuscles
- Specialized sensory receptors responsible for detecting pressure and vibration; rapidly adapting.
Generator Potential
- Channels opened during the generator potential typically admit sodium (Na+) and calcium (Ca2+) ions.
Weber-Fechner Law
- Explores the logarithmic relationship where the rate of impulse discharge increases with the logarithm of stimulus intensity; sensory perception is not linear.
Stimulus Intensity and Discharge Rate
- An increase in stimulus intensity results in a higher rate of discharge from sensory receptors.
Compression of Stimulus Intensity
- Receptors compress significant changes in stimulus intensity into smaller frequency changes of action potentials, maintaining efficiency in signaling.
Maximal Amplitude of Receptor Potential
- The maximal amplitude of receptor potential can vary, but typically it is a measurable value that indicates peak activation.
Generator Potential
- False statement: Generator potentials are not always proportional to stimulus intensity; they can saturate at high levels.
Firing Level of Afferent Nerve
- If the receptor potential reaches the firing level of the afferent nerve, action potentials will be generated, transmitting the sensory signal.
Conduction of Generator Potential
- Conduction of generator potential is characterized by passive local currents that diminish with distance; it is not all-or-nothing but graded in strength.
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Description
Test your knowledge on the properties of generator potential, including its graded amplitude, absence of absolute refractory period, and ability to be summated by temporal and spatial summation.
