-
specialized to respond to specific changes in environment of the cell
neural receptors
-
organization of neural system is ___ of how it works
50%
-
2 classifications of neural receptors?
- type of stimulus
- body location
-
4 types of stimulus?
- mechanical
- thermal
- chemical
- electromagnetic
-
touch, stretch receptors
mechanical stimulus
-
responds to change in temperature
thermal stimulus
-
sensitive to change in chemical environment of cell
chemical stimulus
-
responds to changes in light, visual info
electromagnetic stimulus
-
body location of neural receptors
- exteroreceptors
- enteroreceptors
-
located close to surface of body
exteroreceptors
-
located deep within body, gathers info from things inside body
enteroreceptors
-
ex of enteroreceptors
liver temperature
-
all receptors give same response of?
membrane potential
-
depolarization of the receptor membrane
generator potential
-
third type of membrane potential
generator membrane potential
-
localized and cannot be transmitted
generator potential
-
must be capable of evoking action potentials in a peripheral process of the sensory neuron
generator potential
-
generator potential response is graded according to
stimulus strength
-
NOt an all of nothing response
generator potential
-
the stronger the _____, the greater the ____
- stimulus
- generator potential
-
maintained for as long as the stimulus is present
generator potential
-
the longer the stimulus is present, the ____ is maintained
generator potential
-
3 diff potentials?
- generator
- action
- resting membrane
-
action potentials cannot
overlap
-
4 types of coding action potentials
- stimulus quality
- stimulus location
- stimulus strength
- duration of stimulus
-
type of receptor
coding for stimulus quality
-
location of receptor
coding fro stimulus location
-
coding for stimulus strength?
- frequency of action potential
- number of receptors stimulated
-
low GP=, high GP =
- low frequency of AP
- high frequency of AP
-
strong stimulus =
high GP, constant AP
-
weak stimulus =
weak GP, widely spaced AP
-
-
highest rate of frequency =
150 AP/sec
-
as a stimulus gets stronger and stronger, more receptors
respond
-
as long as stimulus is present, continue to get action potentials
coding for duration of stimulus
-
process of becoming less responsive to continued presence of stimulus
adaptation
-
adaptation can be
slow, intermediate or fast
-
rapidly adapting unit
touch receptor
-
ex of adaption
barrel recpetors of blood pressure most not stop
-
2 actions of local anesthetics?
- receptor vs nerve fiber
- temporary vs reversible
-
in order to have action potential must have
cell membrane
-
LEFT OFF AT SYNAPSE where recording begins
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