TERM 1
Sensory Receptors
DEFINITION 1
a specialized cell that send sensations to CNS - Distributed
throughout the body - tonic receptor - always sending signals
to CNS - phasic receptor - becomes active only with the
changes they monitor
TERM 2
Chemoreceptors
DEFINITION 2
- stimulated by changes in the concentration of chemicals
(ex taste, smell, pH, glucose) - respond to water & lipid
soluble materials dissolved in surrounding fluids - monitor
chemical composition of body fluids (sensitive to pH & CO2
changes) - found in CNS (medulla); responsible for, aortic &
carotid bodies -> breathing and heart rate
TERM 3
Nociceptors
DEFINITION 3
- sense of pain/ tissue damage, stimu lated by mechanical,
electrical, thermal, or chemical ene rgy - free nerve ending with
large receptive field found everywhe re except the brain - provide
protective function, do not adapt we ll - fast (prickling)- quick
usually induces a reflex and ends whe n stimulus ends - slow
(burning)- begins later & persists longe r, more of an ache -
referred - visceral pain that feels like it is coming from another o f
the body, due to the same nerves in nervating both superficial and
visceral structures
TERM 4
Thermoreceptors
DEFINITION 4
- sensitive to temperature change - hot/cold receptors; no
structural difference between the 2 - free nerve endings in
the skin conduct sensations over the same path as
nociceptors - if temp goes above 45 of below 10 C it is felt as
pain - adapts quickly
TERM 5
Mechanoreceptors
DEFINITION 5
-responds to changes in pressure or m ovement of fluid that causes
tissues to be deformed - includes are : - proproreceptors: responds
to changes in muscles & tendons - pres soreceptors: responds to
changes in blood pressure - Baroceptors (stretch re ceptors):
responds to inflation of lungs - T actile receptors: responds to
touch, pressure, & vibrations
