Flashcards in 022414 2 Sensory Receptors Deck (26):
What are the 6 type II (A-beta) mechanoreceptors?
hair follicle receptors
A muscle spindle organ involves either type ____ or type _____ nerve fibers.
What mechanoreceptors are located in hairy skin?
ruff ini ending
What mechanoreceptors are located in hairless skin?
What do ruffini endings detect?
stretching and shapes
What do tactile disks detect?
pressure (very sensitive because they are near the surface)
What do pacinian corpuscles detect?
vibration and touch
What do pacinian corpuscles, meissner corpuscles and merkel discs all detect?
Muscle spindle organs are involved in proprioception. T or F?
What do nociceptors detect?
TRPV1 is an example of a _______. It responds to ions directly and chemicals indirectly via a G coupled protein.
What is the difference between rapidly adapting and slowly adapting mechanoreceptors?
Rapidly adapting are turned on and off by the beginning and end of a continuous stimulus. Slowly adapting are turned on by the beginning of a stimulus, and their action potential frequency gradually decreases.
What is accommodation?
decreased response to persistent action potential
What types of nerve fibers are myelinated?
type I (A-alpha)
type II (A-beta)
type III (A-delta)
What types of nerve fibers are demyelinated?
type IV (C)
What do type I (A-alpha) nerve fibers detect?
What do type II (A-beta) nerve fibers detect?
What do type III (A-delta) nerve fibers detect?
What do type IV (C) nerve fibers detect?
What type of nerve fiber has the fastest conduction velocity? Slowest?
fastest: type I (A-alpha)
slowest: type IV (C)
In the muscle spindle organ, what types of nerve fibers wrap around the intrafusal fibers, detecting stretch?
type I(a) or type II
In the muscle spindle organ, what types of nerve fibers are tethered to the peripheral ends of the muscle spindle organ, causing contraction after stretch is detected?
gamma efferent axons
What is the difference between what muscle spindle organs detect and what golgi tendon organs detect?
muscle spindle organs detect stretch
golgi tendon organs detect stretch and contraction
In the golgi tendon organ, what type of nerve fibers are intertwined in tendon collagen so that when muscles stretch or contract, action potentials are fired?
What do anesthetics block? What type of fibers are blocked first?
voltage gated sodium channels
C fibers (small diameter)