Question

Where are the receptors for smell located in the nose?
A. Olfactory foramina
B. Olfactory bulb
C. Olfactory epithelium
D. None of the above

Answer 1

Receptors are related to sensory organs. The receptors for smell are settled within the olfactory tissue within the nose or nasal chamber so, no matter what the subject of one's nose is we can at once sense its smell.

Complete answer: Olfactory receptors are additionally referred to as smell receptors, supermolecules capable of binding odor molecules that play a central role within the sense of smell (olfaction). These receptors are common in arthropods, terrestrial vertebrates, fish, and different animals. In terrestrial vertebrates, as well as humans, the receptors are set on receptor cells that are present in terribly massive numbers (millions) and are clustered among a tiny low space within the back of the cavum, forming olfactory epithelium. Every receptor cell encompasses a single external method that extends to the surface of the animal tissue and offers rise to a variety of long, slender extensions referred to as cilia. The cilia are lined by the secretion of the cavum, facilitating the detection of and response to odor molecules by olfactory receptors.
Hence, C i.e. olfactory epithelium is the correct option.

Additional Information:
Within the semipermeable membrane, modality receptor proteins are bound in such a simplest way that one finish comes outside the cell and therefore the alternative finish comes within the cell. This makes it potential for a chemical outside the cell, like a molecule of associate odorant, to speak with and manufacture changes within the cellular machinery while not coming into the cell.

Note: The outer and inner ends of receptor proteins involved in smell are connected by a sequence of amino acids. As a result of the chain loops seven times through the thickness of the membrane, it's the same to possess seven transmembrane domains.