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Chapter Chapter 48 & 50

BIOL 186 Chapter Notes - Chapter Chapter 48 & 50: Afferent Nerve Fiber, Body Fluid, Olfactory Bulb


Department
Biology
Course Code
BIOL 186
Professor
Gregory Beaulieu
Chapter
Chapter 48 & 50

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Sensory and Motor
P 1162-1169
Sesory proessig stiulus reeptio →
sesory trasdutio → sesory pereptio →
sensory adaptation.
Remember that integration is always last and
the amplification must follow transduction
SR-ST-SP-SA
- Senses come from stimulus and
represents a form of energy
- Sensory receptor converts stimulus into
enery to change membrane potential
- Sensory input integration motor
output
- Signal transduction amplifies the stim
Affetrent going to the CNS
Efferent leaving the CNS by motor neuron and
into effector cell
Transduction: stimulus sensory receptor
change in receptor membrane permeability
receptor potential (graded change in membrane
potential)
- Stimulu alter the activity of excitable
sensory cells via the transduction of the
signal
Transmission
1) If the receptor = the sensory
neurons fire to CNS
2) If the receptor does not =
the sensory neuron
geerates AP ut does’t
get sent to CNS
Receptor Types
Chemoreceptors chemical solute
or molecular detection
Mechanorecepts pressure, touch, stretch,
motion and sound
Thermoreceptors surface and core
temperatures
Nociceptors pain
Electromagnetic receptors electromagnetic
radiation
Which are incorrectly matched:
Hair cell and mechanoreceptors
Muscle spindle mechanoreceptor
Taste receptor chemoreceptor
Rod electromagnetic receptor
Olfactory receptor electromagnetic receptor
Tastes and smells are distinct kinds of
environmental information in that neural
projections from taste receptors reach different
parts of the brain than the neural projections
from olfactory receptor
sensory adaptation the neurons stop firing
after you have worn you ritchy shirt for a little
bit
an enzyme-catalyzed reaction
magnifies signal strength
Musce spindles: a group of dendrite-
encircled muscle fibres
- Muscle spindles are stretch
receptors within the body of
a musclethat primarily detect
changes in the length of the muscle.
They convey length information to
Transduction amplification transmission integration
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