Which is TRUE about olfactory receptors?
A) They can discriminate only four primary chemicals - sweet, sour, salty, and bitter.
B) When stimulated, their signaling pathway sends action potentials directly to the limbic system.
C) They are unable to detect odorants without activation of taste buds.
D) Only four different types of odorant receptor proteins are found in the plasma membrane of olfactory receptors.
E) They are found in the floor of the nasal cavity and on the upper surface of the hard palate, which separates the mouth from the nose.

Question

Quizplus · Accepted Answer

When olfactory receptors are stimulated, their signaling pathway sends action potentials directly to the limbic system, which is responsible for emotions and memory formation. 
Answer: E
 Olfactory receptors are found in the floor of the nasal cavity and also on the upper surface of the hard palate, which separates the mouth from the nose, allowing us to detect flavors as well as odors. 
Therefore, the choices A, C, and D are incorrect.

Which Is TRUE About Olfactory Receptors