Specialized Tissues, Stem Cells and Tissue Renewal - 2 Flashcards
Specialized epithelium that covers certain parts of the body (sensory tissue of the nose, ears and eyes) are derived from what?
ectoderm
Sensory cells present in the sensory epithelium act as what>
transducers, converting signals from the environment into an electrical form that can be interpreted by CNS
The nose has what type of neurons?
olfactory sensory neurons
The ears have what type of sensory cells?
auditory hair cells
Eyes have what type of sensory cells?
photoreceptors
Each sensory cell carriers at its apical end a specialized structure that detects what?
the external stimulus and converts it into a change in membrane potential
At what end do sensory cells makes synapse with neurons that relay the sensory information to specific sites in the brain?
Basal end
Describe bipolar neurons
Dendrite facing the extracellular environment (interior space of the nasal cavity) and an axon that travels along the olfactory nerve to the olfactory bulb in the brain
What tine structures protrude from the dendtrite?
hair-like cilia
What are between neurons and hold neurons in place and separate them from one another?
supporting cells
Basal cells in contact with the basal lamina are called what?
Stem cells
The free surfaces of cilia on olfactory receptors have what?
odorant receptor proteins
odorant receptor proteins are what type of proteins receptors?
G protein coupled receptors
How many odorant receptor genes are in dogs vs humans?
1000 in dogs and 350 in humans
Each neuron expresses only one of the odorant receptor genes enabling the cell to respond to only what?
one class of odorant
