Where are the Odour receptors located?
**Core Concept**
The sense of smell, or **olfaction**, is mediated by specialized receptors that detect odorant molecules. These receptors are embedded in the membrane of **olfactory receptor neurons**. The location of these receptors is crucial for the detection and transmission of odor signals to the brain.
**Why the Correct Answer is Right**
The correct answer is related to the location of **olfactory epithelium**, which contains the olfactory receptor neurons. These neurons have **dendrites** with **cilia** that increase the surface area, allowing more odorant molecules to bind to the **odor receptors**. This binding triggers a signaling cascade that ultimately leads to the perception of smell.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it is not the primary location of odor receptors.
**Option B:** Incorrect as it does not directly relate to the detection of odor molecules.
**Option C:** Incorrect because, although related to the sense of smell, it is not the specific location of the odor receptors.
**Clinical Pearl / High-Yield Fact**
The **olfactory epithelium** is located in the **nasal cavity**, and damage to this area can lead to **anosmia**, the loss of the sense of smell. This highlights the importance of the nasal cavity in odor detection.
**Correct Answer:** D. Nasal cavity