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The: Can You Smell That

An odor American English or odour British English ; see spelling differences is caused by one or more volatilized chemical compounds that are generally found in low concentrations that humans and animals can perceive by their sense of smell. An odor is also called a "smell" or a "scent", which can refer to either a pleasant or an unpleasant odor.

While "odor" can refer to pleasant and unpleasant odors, the terms "scent", "aroma", and "fragrance" are usually reserved for pleasant-smelling odors and are frequently used in the food and cosmetic industry to describe floral scents or to refer to perfumes. In the United Kingdom and other Commonwealth, English-speaking nations, "odour" refers to scents in general—without positive or negative connotations; Smmell in the United States, and for many non-native English speakers around the world, "odor" generally has a negative Can You Smell That as a synonym for "stink".

The perception of odors, or sense of smell, is mediated by the olfactory nerve. The olfactory receptor OR cells are neurons present in the olfactory epitheliumwhich is a small patch of tissue at the back of the nasal cavity. There are millions Can You Smell That olfactory read more neurons that act as sensory signaling cells. Each neuron has cilia in direct contact with the air. Odorous molecules bind to receptor proteins extending from cilia and act as a chemical stimulus, initiating electric signals that travel along the olfactory nerve's axons to the brain. When an electrical signal reaches a threshold, the neuron fires, which sends a signal traveling along the axon to the olfactory bulba part of the limbic system of the brain.

Interpretation of the smell begins there, relating the smell to past experiences and in relation to the substance s inhaled.

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The olfactory bulb acts as a relay station connecting the nose to the olfactory cortex in the brain. Olfactory information is further processed and forwarded to link central nervous system CNSwhich controls emotions and behavior as well as basic thought processes.

Odor sensation usually depends on the concentration number of molecules available to the olfactory receptors. A single odorant is usually recognized by many receptors. Different odorants are recognized by combinations of receptors.

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The patterns of neuron signals help SSmell identify the smell. The olfactory system does not interpret a single compound, but instead the whole odorous mix. This does not correspond to the concentration or intensity of any single constituent. Most odors consist of organic compoundsalthough some simple compounds not containing carbon, such as hydrogen sulfide and ammoniaare also odorants. The perception of an odor effect is a two-step process. First, there is the physiological part.

This is the detection of stimuli by receptors in the nose. The stimuli are recognized by the region of the human brain which handles olfaction. Because of this, an objective and analytical measure of odor is impossible. While odor feelings are personal perceptionsindividual reactions are usually related.

They relate to things such as genderclick, state of health, and personal history. The ability to identify odor varies among people and decreases with age. Studies show there are sex differences in odor discriminationand women usually outperform men. Pregnant women have increased smell sensitivity, sometimes resulting in abnormal taste and smell perceptionsleading to food cravings or aversions. Chronic smell problems are reported in small numbers for those in their mid-twenties, with numbers Can You Smell That steadily, with overall sensitivity beginning to decline in the second decade of life, and then Thah appreciably as age increases, especially once over 70 years of age.

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For most untrained individuals, the act of smelling acquires little information concerning the specific ingredients of an odor. Their smell perception primarily offers information that elicits an emotional response. Odor perception is a primary evolutionary sense.]