5.1.3 - neuronal communication
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what are sensory receptors
specialised cells that detect changes in the surroundings (stimuli)
sensory receptors are known as transducers. what is a transducer
converts one form of energy to another
how does a sensory receptor respond to a stimulus
by creating an action potential
what do photoreceptors detect
changes in light
what do osmoreceptors detect
water
what do chemoreceptors detect
chemicals
what do thermoreceptors detect
temperature
what do mechanoreceptors detect
touch/pressure
what do proprioceptors detect
body positioning
what kind of receptor is the Pacinian corpuscle
a mechanoreceptor
where is the Pacinian corpuscle found
in the dermis of the skin
how does the Pacinian corpuscle respond when there is a change in pressure
The Pacinian corpuscle is the ending of a single sensory neurone, surrounded by several layers of connective tissue that make up a capsule. When pressure is exerted on the capsule, it becomes deformed. This leads to the development of an action potential
what kind of receptor is the Meissner’s corpuscle and what does it respond to
a mechanoreceptor that responds to touch and low frequency vibration
what kind of receptor is the Ruffini’s endings and what does it respond to
• thermoreceptor, proprioceptor, mechanoreceptor • detects stretch, deformation between joints and warmth
what kind of receptor is the Krause and Bulbs and what does it respond to
a thermoreceptor that detects cold
what kind of receptor is the Merkel’s discs and what does it respond to
a mechanoreceptor that detects light touch
what kind of cells make up the Myelin Sheath
individual Schwann cells make up the Myelin Sheath
what are Nodes of Ranvier
gaps between Schwann cells
does the relay neurone have a myelin sheath
no
what are the differences in the position of the cell body between a motor neuron and a sensory neurone
motor neurone: - cell body is at the end of the neurone and in the CNS sensory neurone: - cell body is in the middle of the neurone in the PNS
where are the dendrites in relation to the cell body in the motor and sensory neurones
motor: - dendrites connect directly to the cell body sensory: - dendrites do not connect to the cell body
does the motor neurone or sensory neurone have a longer axon
the motor neurone has the longer axon
is there a dendron in the motor neurone
no
is there a dendron in the sensory neurone
yes