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sensory systems
sensory
23
Anatomy
Undergraduate 1
07/16/2007

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Term
afferent information is referred to as ____ information
Definition
sensory
Term
receptors
Definition
stimuli in the environment act on receptors: any structure specialized to detect a stimulus
Term
receptors
Definition
stimuli in the environment act on receptors: any structure specialized to detect a stimulus
Term
transducer
Definition
any device that converts one form of energy to another
ex: microphone; lightbulb; or gasoline engine
Term
sensory transducers convert __ to __
Definition
convert stimulus energy into electrochemical energy-a meaningful pattern of action potentials
Term
sensory transduction
Definition
the process of converting stimulus energy to electrochemical energy
Term
receptor potential
Definition
local potential-a graded voltage change across the plasma membrane of the receptor cell
Term
sensation
Definition
a conscious awareness of a stimulus
Term
four kinds of information the sensory receptors transmit
Definition
modality, location, intensity, and duration
Term
modality
Definition
the type of stimulus or the sensation it produces
Term
receptive field
Definition
vary depending on the location on the body
Term
sensory projection
Definition
ability of the brain to identify the site of stimulation
Term
projection pathways
Definition
pathways followed by sensory signals to their ultimate destinations in the CNS
Term
proprioceptors
Definition
sense the position and movement of the body or its parts
occur in muscles, tendons and joint capsules
Term
exteroceptors
Definition
sense stimuli external to the body; they include teh receptors for vision, hearing, taste, smell, touch, and cutaneous pain
Term
nociceptors
Definition
pain is mediated by these; its own special nerve fibers
Term
myelinated fibers produce sensation of ___ pain
Definition
fast
Term
unmyelinated pain fibers produce ____pain
Definition
slow
Term
somatic pain
Definition
pain from the muscles, skin and joints
Term
pain from the viscera
Definition
visceral pain
Term
bradykinin
Definition
most potent pain stimulus known-intensely painful and injected underneath the skin
Term
analgesic
Definition
the term referring to pain-relieving mechanisms taht are just beginning to be understood
Term
enkephalins
Definition
-two analgesic oligopeptides that bind to the receptors that opium and morphine do
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