Receptors, Reflex Arc. Etc
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| What are 3 characteristics of the Reflex Arc? | 1. Simplest Functional Circuit of the NS; 2. does NOT involve the Brain; 3. produces an Immediate, INVOLUTARY motor response to stimuli
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| What are the components of the Reflex Arc? | 1. Receptor; 2. Sensory Neuron; 3. Interneuron (optional); 4. Motor Neuron; 5. Effector (muscle or gland)
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| What is the function of Receptors? | REPOND to SPECIFIC environmental energy forms (stimuli), internal or external
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| What are the different Receptors? | 1. Photoreceptors; 2. Acoustic Receptors; 3. Mechanoreceptors; 4. Chemoreceptors; 5. Thermoreceptors
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| What is the function of Receptor Potentials? | to Stimulate AP's
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| name a Mechanoreceptor sensitive to pressure. | Pacinian Corpuscle
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| How is a stimulus transformed into an Electrical Response? | 1. Membrane Distortion; 2. increased permeability to ALL Ions; 3. Receptor Potential; 4. AP's propagated from 1st Node
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| How long are AP's propagated from a Receptor? | until Sensory receptor REPOLARIZES
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| What is a Receptor Potential? | localized Depolarization
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| What are 3 characteristics of Receptor Potentials? | 1. NOT all-or-none, GRADED Amplitude; 2. duration = Duration of Stimulus; 3. NOT propagated to CNS, only to 1st Node
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| What determines AP Frequency? | Stimulus INTENSITY
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| What determines Sensory AP Frequency? | Receptor Potential AMPLITUDE
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| What is the definition of Receptor Adaptation? | a DECREASE in Sensory AP Frequency despite an UNCHANGING environmental Stimulus
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| What is the function of Receptor Adaptation? | enables the CNS to devote attention to IMPORTANT/Changing Stimuli
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| Which Receptors do not adapt? | Pain receptors
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| Name 2 examples of Fast Adapting Receptors. | Pacinian Corpuscles, Smell
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| Name 2 Slow Adapting Receptors. | Kinesthetic, Pain
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| How do Fast/Slow Adapting Receptors work? | by Increasing or Decreasing AP Frequency despite unchanging environmental stimulus
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Created by:
Kristel
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