Lab 22- General Sensations
leaning on your elbows; is it exteroceptor or interoceptor; name the specific receptor type
lamellar corpuscles-exteroceptor proprioceptors- interoceptor
which two body areas tested were most sensitive to touch
lips and fingertips
why would it be dangerous to be without cutaneous sense organs?
many external stimuli (heat, cold, pressure) which can threaten homeostasis might go undetected and proper protective measures might not be taken
where was referred pain felt when the elbow was immersed in ice water during the laboratory experiment
medial aspect of hand (medical aspect of upper arm)
why is the non adaptability of pain receptors important
pain is a warning of actual or potential tissue damage
which cutaneous receptors are the most numerous
pain receptors
someon steps on your foot; is it exteroceptor or interoceptor; name the specific receptor type
pain receptors and lamellar corpuscles both exteroceptors
What was shown by the two point discrimination test?
relative density of touch receptors in various body areas (lips, fingertips, ect)
where would referred pain appear if the following organs were receiving painful stimuli gallbladder, kidneys, and appendix
right inferior thorax
what region of the cerebrum interprets the kind and intensity of stimuli that cause cutaneous sensations
somatosensory association cortex
How do sensory receptors act as transducers?
they convert other energy typed eg. pressure (mechanical energy) to the electrical nerve impulse
which two body areas tested were least sensitive to touch
ventral forearm and back of neck
bulbous corpuscle, lamellar corpuscle, tendon organ, tactile corpuscle; which is the "odd" receptor out
Tendon organ because it is not a cutaneous receptor.
define punctate distribution
having specific localization of found at certain discrete points
Exteroceptor; location and stimulus source
at or close to the body surface; stimuli in external environment
Interoceptor location and stimulus source
in viscera or deep in body tissues; internal stimuli
why is it advantageous to have pain receptors that are sensitive to all vigorous stimuli, whether heat, cold, or pressure
because all of these stimuli, if excessive, cause tissue damage
what is the probable explanation for referred pain?
both the site of referred pain and the visceral region receiving the actual painful stimulus are innervated by different sensory neurons that then stimulate the same interneurons in a specific spinal segment of the cord. these sensations are then interpreted by the somatosensory cortex
the "too full" sensation; is it exteroceptor or interoceptor; name the specific receptor type
interoceptor- visceral receptors (stretch)
doing sit ups; is it exteroceptor or interoceptor; name the specific receptor type
interoceptor-proprioceptors
define a stimulus
change in the environment of a sensory receptor
define adaption of sensory receptors
decline in receptor sensitivity and stimulation with prolonged unchanging stimuli
Backing into a sun-heated iron railing; is it exteroceptor or interoceptor; name the specific receptor type
exteroceptor
seasick; is it exteroceptor or interoceptor; name the specific receptor type
exteroceptor- equilibrium apparatus of the inner ear
reading a book; is it exteroceptor or interoceptor; name the specific receptor type
exteroceptor- rods/cones of the eye (photoreceptors)
tendon organ, muscle spindle, hair follicle receptor, and free nerve endings; which is the "odd" receptor out
free nerve endings. the other three receptors are found closely associated with a specific structure and are also very specialized in their functions
define referred pain
when pain is perceived as coming from a site other than that receiving the painful stimulus