What are the enlarged smell receptors that extend into the nasal cavity called?

The enlarged smell receptors that extend into the nasal cavity are known as olfactory bulbs. These structures are an essential part of the olfactory system and are responsible for processing smell information. Located at the base of the brain, the olfactory bulbs receive sensory input from olfactory receptor neurons located in the nasal cavity. When we inhale, odor molecules bind to these receptors, sending signals to the olfactory bulbs, which then relay this information to other areas of the brain associated with the perception of smell.

In contrast, the other options refer to different anatomical structures or concepts related to the respiratory or olfactory systems, but they do not accurately describe the enlarged smell receptors in the nasal cavity. Understanding the role of the olfactory bulbs is crucial for grasping how our sense of smell functions and how it connects to the brain.