nose Flashcards
(16 cards)
What are the primary functions of the nose?
Inhaling and exhaling air, and responsible for smell.
Where are the smell sensory receptors located?
At the top of the nasal cavity.
What area contains the smell sensory receptors?
An area of 5 cm² of the olfactory epithelium.
Approximately how many olfactory sensory receptors are there?
About 15 million.
What do olfactory sensory receptors attach to?
The olfactory nerve.
Where do olfactory sensory receptors transmit information to?
The cerebrum.
What is the olfactory epithelium?
A region in the upper part of the nose containing millions of olfactory cells.
What are olfactory cilia?
Specialized sensory neurons located in the olfactory epithelium.
What bone does the axon of olfactory neurons cross?
Ethmoid.
What is the olfactory bulb?
The end of the olfactory nerve.
How many different odors can human olfaction detect?
About 10,000 different odors.
What are the four conditions for a substance to be perceived by smell? (List)
- Must be odorous
- Must be volatile
- Must have a high enough concentration
- Must get in contact with the cilia
Fill in the blank: During an inhalation, odorous molecules will enter the nasal cavity and stimulate the _______.
olfactory cilia.
What transforms the odor into a nerve impulse?
The olfactory epithelium.
What does the nerve impulse travel along to reach the olfactory area of the brain?
The olfactory nerve.
True or False: The brain analyzes the influx of nerve impulses before one can perceive the smell.
True.
