Belonging Essay

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Smell, Taste and Touch Smell * You detect a smell when a few tiny chemical particles enter your nose and dissolve in its moist lining. * The dissolved substance triggers nerve cells in the upper nasal cavity called olfactory cells. * Electrical impulses in the olfactory nerve sends messages to the brain so you can smell the substance. * When you chew, food releases chemicals that immediately travel up into your nose and trigger the olfactory receptors. * The typical nose can detect around 2000 smells and can be trained to detect up to 10 000. * Sneezing is a reflex action that removes irritating dust or other foreign particles from the nasal passages. * A sneeze can travel at 160km/hr. Taste * Taste - the sensation of flavour perceived in the mouth and throat when the substance chemically reacts with the receptors of the taste buds. * The surface of your tongue is covered with thousands of bumps called papillae. * More than 10 000 taste buds are embedded between the papillae. * Humans can detect five primary taste sensations: sweet, sour, salty, bitter and umami. * Umami is the savoury taste found in glutamate found in processed meats, cheeses and monosodium, commonly known as MSG. * Each primary taste sensation has its own type of taste bud that detects it. * Saliva in your mouth must first dissolve samples of food so that the taste receptors on our taste buds can detect them and send messages to the brain. * Taste buds have very sensitive microscopic hairs called microvilli which send messages to the brain about how something tastes. * Taste buds provide info on the intensity and level of pleasantness of the taste. * Although all areas of the tongue can detect all taste sensations, some areas are more sensitive to a certain taste. Flavour * As you eat, your senses of smell and taste word

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