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Receptors

Receptors, Reflex Arc. Etc

QuestionAnswer
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
What are the components of the Reflex Arc? 1. Receptor; 2. Sensory Neuron; 3. Interneuron (optional); 4. Motor Neuron; 5. Effector (muscle or gland)
What is the function of Receptors? REPOND to SPECIFIC environmental energy forms (stimuli), internal or external
What are the different Receptors? 1. Photoreceptors; 2. Acoustic Receptors; 3. Mechanoreceptors; 4. Chemoreceptors; 5. Thermoreceptors
What is the function of Receptor Potentials? to Stimulate AP's
name a Mechanoreceptor sensitive to pressure. Pacinian Corpuscle
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
How long are AP's propagated from a Receptor? until Sensory receptor REPOLARIZES
What is a Receptor Potential? localized Depolarization
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
What determines AP Frequency? Stimulus INTENSITY
What determines Sensory AP Frequency? Receptor Potential AMPLITUDE
What is the definition of Receptor Adaptation? a DECREASE in Sensory AP Frequency despite an UNCHANGING environmental Stimulus
What is the function of Receptor Adaptation? enables the CNS to devote attention to IMPORTANT/Changing Stimuli
Which Receptors do not adapt? Pain receptors
Name 2 examples of Fast Adapting Receptors. Pacinian Corpuscles, Smell
Name 2 Slow Adapting Receptors. Kinesthetic, Pain
How do Fast/Slow Adapting Receptors work? by Increasing or Decreasing AP Frequency despite unchanging environmental stimulus
Created by: Kristel