Scientific Objections: Even on the purely biological plane there is a wide, unbridgeable chasm between man and beast, as illustrated by the following four considerations: 1  The human brain possesses qualities [G2, p. 115â130] that have no parallel in the animal world. One consequence is manâs explicit mental capabilities.
Olfactory System. The olfactory system is responsible for our sense of smell. This sense, also known as olfaction, is one of our five main senses and involves the detection and identification of molecules in the air. Once detected by sensory organs, nerve signals are sent to the brain where the signals are processed. Our sense of smell is closely linked our sense of taste as both rely on the perception of molecules. It is our sense of smell that allows us to detect the flavors in the foods we eat. Olfaction is one of our most powerful senses. Our sense of smell can ignite memories as well as influence our mood and behavior. Olfactory System Structures. Our sense of smell is a complex process that depends on sensory organs, nerves, and the brain. Structures of the olfactory system include:
The human sense of smell. Although the human sense of smell is feeble compared to that of many animals, it is still very acute. We can recognise thousands of different smells, and we are able to detect odours even in infinitesimal quantities. Our smelling function is carried out by two small odour-detecting patches â made up of about five or six million yellowish cells â high up in the nasal passages. For comparison, a rabbit has 100 million of these olfactory receptors, and a dog 220 million. Humans are nonetheless capable of detecting certain substances in dilutions of less than one part in several billion parts of air.