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The nose is responsible for smell. Mucous membranes line the nose cavity. The cavity has smell receptors linked to the olfactory nerve. Smells consist of vapors and a range of other substances. Smell receptors come into contact with vapor molecules and send out the sensations to the central organ, the brain. The olfactory system in the brain processes olfaction. Molecules have a variety of features which excite particular receptors less or more strongly. The interactions of excitatory signals from diverse receptors comprise what humans perceive as the molecule's smell. Different from other neurons, the olfactory receptor neurons in the nose are different from most other neurons since die and redevelop on a regular basis. The sense of smell can be temporarily lost when an individual has a cold (Serres Cheap Vinny Curry Jersey , 2008).
Taste
Taste is the ability to the taste of different substances. Humans receive tastes through buds as the sensory organs. Buds are found in numbers on the upper surface of the tongue. There are also located near the pharynx in the roof of the mouth. There are numerous tastes including bitter, sweet, sour and salty. The buds can detect "umami Cheap Chandler Catanzaro Jersey ," a sensation caused by amino acids. The buds at the end of the tongue are responsive to sweet tastes while those in the back are responsive to bitter tastes. Buds located at the top and on the sides are sensitive to sour and salty tastes. The nerves at the base of each taste bud send the sensations to the brain. The quantities of taste buds vary considerably from a person to another. The higher the number of taste buds, the greater the sensitivity (Serres, 2008)
Touch
Touch results from the activation of neural receptors. It is distributed throughout the body. The skin has hair follicles that are attached to nerve endings. The nerve endings transmit sensation to the brain. There are four kinds of sensations that are identifiable including heat Cheap Ryan Jensen Jersey , cold, pain and contact. Hair follicles amplify the sensitivity and pressure the receptors to respond to variations in sensitivity. Individuals may lose or impair their ability to feel a sense of touch that may result from temporary or permanent nerve damage (Banes & Lepecki, 2012).
Hearing
The ear is responsible for sound perception. The sound is made up of vibrations propagating through a medium such as air. The outer ear conveys vibrations to the inner ear through malleus Cheap Beau Allen Jersey , incus, and stapes. The inner ear is covered on the inside by nerve fibers that respond to the vibrations and convey impulses to the brain through the auditory nerve. The three semicircular canals are responsible for spatial orientation and the sense of balance. The inner ear is also filled with a thick fluid and small particles with calcium carbonate. The movements of calcium carbonate particles over hair cells. Mechanoreceptors are found in the inner ear turn motion into electrical nerve pulses. The brain integrates the input of both ears to establish the distance a