Sense Organs
how is an impulse from a sense organ interpreted?
according to where they are received in the brain
most sense organs have receptors that pick up stimuli from where?
an external enviroment
receptors that are stimulated by changes in concentration of chemical substances
chemoreceptors
these receptors are associated with the senses of taste and smell
chemoreceptors
what are the most familiar sense organs?
eyes, ears, tongue, nose, and skin
what has extremely fine projections like cilia?
hair cells
what are the 2 types of thermoreceptors?
heat and cold receptors
as receptors adapt, impulses do what?
leave at slower rates until finally they may completely fail to send signals
examples of this type of receptor are sound vibrations, touch, muscle contractions, or movement of joints
mechanoreceptors
hair cells are the most common of this receptor
mechanoreceptors
receptors that respond to mechanical pressures, such as changes in pressure or movement of fluids
mechanoreceptors
small groups of flattened connective tissue cells found in hairless portions of the skin; palms, fingertips, and lips; sensitive to light touch and texture
meissner's corpuscles
large structures of connective tissue fibers and cells; found in deeper subcutaneous of such areas as the hands and feet;they also occur in tendons and ligaments of joints; stimulated by heavy pressure
pacinian corpuscles
receptors that are stimulated by tissue damage and generate impulses interpreted as pain
pain receptors
receptors that respond whenever they are exposed to sufficient intensity of light
photoreceptors
this type of receptor only occurs in the eyes
photoreceptors
projection allows a person to do what?
pinpoint the region of stimulation
the process where the brain projects the sensation back to its apparent source
projection
all sense organs have specialized what for stimuli?
receptors
what receptors are associated with somatic senses?
receptors associated with the skin, muscles, joints, and visceral organs
a feeling that occurs when sensory impulses are interpreted by the brain
sensation
when receptors are subjected to continuous stimulation, many of them go through an adjustment called what?
sensory adaptation
common in epithelial tissue; associated with touch and pressure
sensory nerve fibers
the disorder in which there is a blending or crossing of 2 or more senses
synthesia
at the same time a sensation is created, the brain causes it to seem to come from where?
the receptors being stimulated
how are sense organs classified?
the stimuli that activates them
receptors that respond to heat or cold, either inside or outside of the body
thermoreceptors
what does it mean when a sense organ is a transducer?
they transform one form of energy into another
these receptors are sensitive to mechanical forces
touch and pressure senses
