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Description: WHY DO WE SNEEZE ? | AMAZING FACTS ABOUT SNEEZING SUBSCRIBE CHANNEL - youtube.com/channel/UCl6T... ---------------------------------------------------------------------------- LIKE THE FACEBOOK PAGE facebook.com/Jigyaasa-Cur... CONNECT ON INSTAGRAM instagram.com/seekenjigyasa ---------------------------------------- SOURCES: scientificamerican.com/article/why-do-we-sneeze sciencefocus.com/the-human-body/if-we-only-have-one-trachea-why-do-we-have-two-nostrils emedicine.medscape.com/article/835585-overview ncbi.nlm.nih.gov/pmc/articles/PMC3018978 --------------------------------------------------- Two eyes, two ears, two nostrils. We need our doubles for stereoscopic vision, stereo sound, and super smelling. Our nostrils are separated by a septum, in effect giving us two noses. Most of the time, one nostril allows less air to pass through than the other, with the nasal flow switching every few hours. The slower airflow is caused by the tissue inside swelling with increased blood flow. We smell using sensory cells high up in the nose, and some odour chemicals need more time than others to bind to these receptors. So a low-airflow nostril gives slow-acting odours more time to be detected, giving us a greater range of smell. The olfactory sense could have unbelievable attributes if we consider its' capacity to modulate human behaviors. It has determinant roles in the evolution of human habitat, in the way of preparing food and, most important of all, in the social behavior. The odor is thought to be essential in defining human inner ego as an indispensable attribute of sophistication and complexity. The odor can even allow tracing the limits between professions, races, or diseases. Back in the ancient times, perfumes used to play a part in defining sexuality consciously contributing to the unconscious effect of pheromone–like chemicals on the vomeronasal organ. The smell is linked to taste and appetite in the same way emotions are associated with arts and normal social life requires intense participation of all the five senses in variable proportions, depending on the situation The olfactory system represents one of the oldest sensory modalities in the phylogenetic history of mammals. As a chemical sensor, the olfactory system detects food and influences social and sexual behavior. The specialized olfactory epithelial cells characterize the only group of neurons capable of regeneration. Activation occurs when odiferous molecules come in contact with specialized processes known as the olfactory vesicles. Ultimately, the nerve ending stimulation leads to activation of a reflex inside the brain. The nervous impulse travels up the sensory nerves and down the nerves controlling muscles in the head and neck, and that leads to the rapid expulsion of air. The high velocity of the airflow is achieved by the buildup of pressure inside the chest with the vocal chords closed. Sudden opening of the cords allows the pressurized air to flow back up the respiratory tract to expel the irritants. This helps to remove offending particles in the nose. However, in infected individuals, it also allows for the spread of the common cold, as innumerable viral particles are contained within each droplet of mucus expelled. Various medications are available to help control this reaction. Antihistamines act principally by blocking the action of histamine at receptors located on the blood vessels in the nose. Some prescription antihistamines are nonsedating, compared with their over-the-counter counterparts. Decongestants stimulate receptors located on the same vessels to cause constriction and lessen the congestion. Topical nasal steroids are used in allergic patients to reduce the number of inflammatory cells and ultimately inhibit the release of histamine.