Class 5 - Sensation, Perception, Sensory Receptors Flashcards
Sensory receptors can be of three types:
specialized separate cells
dendrites of sensory neurons: free nerve endings or encapsulated nerve endings
Describe “selectivity” in regards to sensory receptors
they may respond vigorously to one particular stimulus and only weakly or not at all to other stimuli
Define “transduction”
conversion of chemical energy to electrical energy to result in graded potentials
What sensations are detected by free nerve ending receptors?
pain, temperature, tickle, itch, some touch sensations
What types of sensations are sensed via encapsulated nerve ending receptors?
pressure, vibration, some touch
What types of sensations are sensed via separate cell receptors?
taste buds
photoreceptors in the retinas
hair cells in the inner ear
Free & encapsulated nerve endings, olfactory & taste receptors generate ____ potentials, whereas separate cell receptors generate ____ potentials
graded/generator
receptor
How does a receptor potential transmit to a sensory nerve?
neurotransmitters are released which produce a post synaptic potential in the first order neuron
Differentiate exteroceptors vs. interoceptors vs. proprioceptors
extero: external surface of body/environment
intero/viscero: blood vessels, organs, internal environment (not consciously perceived)
proprio: body position, mm length & tension, joint movement
Mechanical receptors detect ____ and ___. Electromagnetic detect ___ and ____.
sound waves and pressure
light and heat
Generator potentials and receptor potentials ___ during constant/sustained stimuli. This is called ____.
decrease
adaptation
Which type of receptors are rapidly adapting?
those related to pressure, touch, and smell
Which type of receptors are slowly adapting?
pain, body position, chemical composition of blood
