Chp 13 Flashcards
Every time you hear receptor what system are we talking about? Afferent or efferent
afferent
Mechanoreceptors
are found in areas where there are any physical changes to the area. Are always keeping track of any physical changes
Thermoreceptors
any changes in heat
Modality
each input is a specific type of sensation: temperature, pain, pressure, touch, body position, equilibrium, hearing, vision, smell, taste
individual sensory neurons generally carry only one modality
individual sensory neurons generally carry only one
modality
Selectivity of Receptors
sensory neurons respond strongly to one type of stimulus and weakly or not at all to other types
some respond accidentally to other types of stimuli – rubbing one’s eyes mechanically stimulates the eyes’ light receptors in the retina is an example of
Selectivity of Receptors
transduction
requires a sensory receptor cell or organ which responds to specific stimuli and converts them into receptor/generator potentials
integration generally occurs?
in the cerebral cortex
types of sensory receptors classified by stimulus
mechanorecpetors
thermoreceptors
photoreceptors
chemoreceptors
types of sensory receptors classified by location
exteroreceptors
interoreceptors
proprioreceptors
Mechanoreceptors
mechanical pressure or stretching
generate action potentials when deformed
Thermoreceptors
changes in temperature
Nociceptors
pain due to physical or chemical damage to nearby tissue
Photoreceptors
light strikes retinal receptor cells
generates action potentials in response to light energy
Chemoreceptors
certain specific chemical molecules are detected in the mucous fluids of the GI & respiratory tracts, or in the blood or other body fluids
Exteroceptors
located at or near the body’s surface
provide information about the external environment
Thermoreceptor sends temp to where in the brain
hypothalamus cause it deals with temperature
Interoceptors (visceroceptors)
found in blood vessels, connective tissues, and organs
provide information about the internal environment
If there was physical damage or chemical damage to the tissue like stomach acid eroding up will alert what receptor
nociceptor
Photoreceptors are found
in our eyes
Proprioceptors
located in muscles, tendons, joints and the internal ear
provide information about gravity, body and limb positions and skeletal muscle movements
Changes in any kind of chemical composition of things internally. PH of blood stream triggers what receptor
Chemoreceptors
Baroreceptors are found where
In the cardiovascular system
Baroreceptors keep track of
all of the pressure in blood vessels
Receptors found on joint endings, tendons and internal ear. That tell us our balance and send signals to the cerebellum
proprioceptors
Anesthesia means
lack of sensation. Blocking the afferent pathway from being read or intergrated
gas agents that affect the brain or spinal cord from receiving any messages
general anesthesia
Anesthesia that only effects that peripheral nerve
local anesthesia
Can be ingested or applied topically.
Nonsteriodal antiinflamittory. Ibprofen… advil.
Analgesia
Can start to mimic our own bodies natural endorphants
analgesic
anagesic reduce
the perception of pain by blocking the nociceptors from sending the messages to the brain
the bodies natural ability to block nociceptors
endorphins
endorphins suppress
pain
Local anesthesia
– drugs injected near peripheral nerves inhibit the opening of gated sodium channels, preventing local transmission of action potentials
Analgesia vs anethesia
analgesia reduce the perception of pain by blocking nociceptors. anesthesia nerves inhibit the opening of gated sodium channels, preventing local transmission of action potentials
Paresthesias
abnormal sensations (burning, tingling, numbness) not related to normal stimulation, e.g., mechanical pressure on nerves in your leg puts your foot “to sleep”
alerts you to thinking nerve pain on the efferent or afferent pathway
parasthesias
dermatome
is if you were to follow the spinal cord and nerve roots that come off of it. Each area has a pattern where the nerve innervates the skin. Only for cutaneous branches of the spinal nerve.
why are dermatomes important for a clinical setting
to determine which level is effected if you have nerve damage
Reflex Activity 5 Steps
1) Receptor
2) Sensory neuron
3) Integrating center
4) Motor Neuron
5) Effector
Is the reflex arch ipsilateral or contralateral
ipsilateral, because it never crosses over to the other side of the spinal cord. The afferent and efferent pathways are on the same side.