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Senses! Did You Know?Senses are very useful.
SMELL Smell is a very direct sense. In order for you to smell something, molecules from that thing have to make it to your nose. Everything you smell, therefore, is giving off molecules -- whether it is bread in the bakery, onions, perfume, a piece of fruit or whatever. At the top of your nasal passages behind your nose, there is a patch of special neurons about the size of a postage stamp. These neurons are unique in that they are out in the open where they can come into contact with the air. They have hair-like projections called cilia that increase their surface area. An odor molecule binds to these cilia to trigger the neuron and cause you to perceive a smell.
Need for sense of smell! • Human Beings have the ability to smell more than 10,000 different types of smells. • We need to distinguish between the 10000 smells. • Smell also helps us in tasting different substances. • Smell helps us save our lives as we can smell smoke before we can see the fire. • It can help us choose between various fragrances.
TOUCH Touch is actually a grab bag of various somatic senses, including the sensations of: • Temperature • pressure • Pain • kinesthetic senses It give us a conception of our body in space (proprioception), and visceral senses such as stomach aches or nausea.
Touch! Touch information is processed in the postcentralgyrus, corresponding roughly to the top middle area of the brain. The postcentralgyrus, or parts of it, are often referred to as the primary somatosensory cortex. This area gets more direct sensory input information than any other in the brain.
Need for sense of touch • Animals use touch to navigate in complex environments. • They appraise their immediate. • They detect the presence of food. • It’s the most primitive.
TASTE The sense of taste begins with the taste buds, located on top of the fungiform papillae, or the large bumps on the tongue. Other taste receptor cells can be found on the palate and in the throat, but the tongue has the most. The fungiform papillae are shaped similar to mushrooms and sometimes swell a little when stimulated. Alongside the fungiform papillae are the filiform papillae, little brush-shaped protrusions that lack taste buds.
Need for sense of taste It is needed for tasting, if the substance is • sweet • sour • salty • Savory It is needed for recognizing the different tastes in the world.
