Olfaction
Olfaction is the function of smelling. Vertebrate has sensory cells in the nasal cavity and Invertebrate has antenna
for odor detection. Olfaction Humans occurs when odor molecules spread olfactory
receptor can sense specific sites. These receivers are used to detect the presence
of smell. They are joined at the glomerulus, a structure which transmits
signals to the olfactory bulb (cerebral structure directly above the nasal cavity
and below the frontal lobe). Many vertebrates, including most mammals and
reptiles have two separate systems: the main olfactory system, olfactory and
accessory olfactory system (mainly used to detect pheromones). For animals that
breathe air, the main olfactory system detects volatile chemicals and the accessory
olfactory system detects fluid phase chemicals. Olfaction, tasteful, is a form
of chemoreception. Themselves chemicals which activate the olfactory system,
generally at very low concentrations, are known odorants. Although the taste and
smell are separate sensory systems in terrestrial animals, organisms living in
water often have a chemical sense. Odorous volatile small molecules, proteins non-volatile
and non-volatile hydrocarbons can produce all olfactory sensations. Some species
of animal are able to sense carbon dioxide.
