Sensory Receptors 1 Flashcards
What is a transducer
Something that converts various forms of energy to into Action Potentials. With energy stength represented by AP frequency
Define sensory modality:
The type of stimulus activating a specific receptor
Define adequate stimulus:
The type of energy a receptor normally responds to. can also respons to extremes of other energies (i.e. the eye normally repsons to light but youll see stars if someone pokes you in the eye)
What do mechanoreceptors detect?
Pressure, touch, hearing, balance, blood pressure
What do proprioceptors detect?
Postion of limbs or body parts from the joints and muscles
What receptors detect painful stimuli?
Nociceptors.
What type of graded membrane potential change is produced by an adequate potential?
A generator potential or receptor potential
What is the adequate stimulus in cutaneous mechanoreceptors and how does it trigger a generator potential?
Membrane deformation from pressure and activates stretch-sensitive ion channels in the membrane.
What effect does increasing the stimulus intensity have on APs?
It increases the number (or frequency) of APs.
lager stimulus = larger receptor (generator) potential = higher frequency of APs
What does the number of receptors activated refelct?
Stimulus intensity.
What do merkel receptors detect?
Steady pressure & texture
What receptors detects flutter or stroking movements?
Meissners corpuscles
What part of a nociceptor detects noxious stimuli?
Free nerve endings
What do ruffini corpuscles respond to?
SKin stretch
How is vibration detected in the skin?
By pacinian corpuscles