1. All sensory cells: are sensory neurons. are specialized epithelial cells. exp
ID: 3477820 • Letter: 1
Question
1. All sensory cells:
are sensory neurons.
are specialized epithelial cells.
express receptors that transduce physical stimuli into electrophysiological changes.
encode the intensity of a stimulus through adaptation.
E. encode the modality of a stimulus through action potential frequency.
2. Sensory neurons experience generator (or receptor) potentials within their __________.
dendrites
axons
nerve terminals
all of the above
none of the above
A.are sensory neurons.
B.are specialized epithelial cells.
C.express receptors that transduce physical stimuli into electrophysiological changes.
D.encode the intensity of a stimulus through adaptation.
E. encode the modality of a stimulus through action potential frequency.
2. Sensory neurons experience generator (or receptor) potentials within their __________.
A.dendrites
B.axons
C.nerve terminals
D.all of the above
E.none of the above
Explanation / Answer
1. Sensory cells are basically sensory neurons which respond to sensory stimulus. They are originated from epithelial cells especially sqamous epithelial cells. Sensory neurons convert a specific type of stimulus via their receptors into action potential. This is called as sensory transduction. They encode the intensity of stimulus by variation in spike frequency. They encode the strength of stimulus by frequency of action potential.Thus option (A) (B) and (C) are correct.
2. When the gated ion channels open at the time of stimulus, the ions flow through the channel causing a change in membrane potential. This type of change of membrane potential occurs only in sensory dendrite and is called as receptor potential. Thus sensory nuerons experience geneator or receptor potential within their dentrites.Hence answer (A).
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