Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
30 Cards in this Set
- Front
- Back
|
sensory receptor classification: traditional
|
sight
hearing touch taste smell other: interoceptive (unconscious) proprioceptors chemical thermal balance |
|
|
chemoreceptors
|
O2, CO2, H+, taste, smell
|
|
|
mechanoreceptors
|
pressure, tension, vibration, position
|
|
|
electroreceptors
|
fish - lateral line (can detect predators in dark)
|
|
|
magnetic field receptors
|
birds, sea turtles, dogs
|
|
|
thermoreceptors
|
heat/cold - pit vipers
|
|
|
photoreceptors
|
vision - pineal eye
|
|
|
nociceptors
|
pain/tissue damage
|
|
|
superficial
|
touch, pressure, flutter, vibration, tickle, warmth, cold, pain, itch
|
|
|
visceral
|
hunger, nausea, distention, visceral pain
|
|
|
sensory receptor potentials
|
vary with stimulus strength
not all-or-none must reach threshold to produce an action potential APS transmit information to CNS |
|
|
sensory receptor amplification
|
can produce electrical signal containing greater energy than contained in the stimulus
|
|
|
first order neurons
|
primary afferent neurons
peripheral ending functions as sensory receptor or receives input from accessory sensory cell cell body usually located in dorsal root ganglion or cranial nerve ganglion |
|
|
second order neurons
|
usually located in spinal cord or brainstem
receives info from first order transmits to neurons in thalamus axon usually crosses midline of spinal cord (contralateral) |
|
|
third order neurons
|
reside in one of sensory nuclei of thalamus
may transform info before transmitting to cerebral cortex |
|
|
fourth order neurons
|
located in appropriate sensory receiving areas of cerebral cortex
process info further |
|
|
higher order neurons
|
located in cerebral cortex
process info further within some unknown site the infor results in perception |
|
|
slow adapting receptors
|
long-lasting stimulus produces prolonged, repetitive discharge in primary afferent neuron
|
|
|
rapidly adapting receptors
|
long-lasting stimulus produces only a short-lived response
|
|
|
sensory coding
|
modality
location intensity frequency duration |
|
|
Pacinian corpuscles
|
high frequency vibration
pressure |
|
|
nociceptors
|
mechanical, thermal, chemical damage
|
|
|
sclera
|
fibrous coat
gives structure to eye |
|
|
conjuctiva
|
white part of eye
|
|
|
retina: rods
|
low light
no color |
|
|
retina: cones
|
sharp images
color |
|
|
optic disc
|
blind spot
where optic nerve exits eye |
|
|
Canal of Schlemm
|
scleral venous sinus
drains aqueous fluid relieves pressure (norm < 22 mmHg) |
|
|
fovea
|
center of macula
most acute no rodes |
|
|
iris
|
radially (dilatory) and circulatory (sphincter) oriented smooth muscle
|
