Olfactory receptors also have to be replaced as they

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Olfactory receptors also have to be replaced as they naturally die off about every 5 to 8 weeks. Unlike taste buds, there are more than five types of olfactory receptors. There are actually at least 1,000 of them. The Olfactory Bulbs The olfactory bulbsare located right on top of the sinus cavity on each side of the brain directly beneath the frontal lobe. The olfactory receptors send their neural signals directly p to these bulbs by passing the thalamus, the relay center for all other senses. Somesthetic Senses: What the Body Knows What is thought of as the sense of touch is really several sensations, originating in several different places in and on the body. It's really more accurate to refer to these as the body senses, or somesthetic senses. The first part of the word, soma, means body. The second part, esthetic, mean feeling. There are three somesthetic sense systems: the skin senses(having to do with pressure, temp, and pain), the kinesthetic sense(having to do with the location of body parts in relation to the ground and to each other), and the vestibular senses(having to do with movement and body position). PERCEPTION OF TOUCH, PRESSURE, AND TEMPERATURE 3.7 what allows people to experience the sense of touch, pain, motion, and balance?
Skin is an organ. Its purposes include more than simply keeping bodily fluids in and germs out; skin also receives and transmits information from the outside world to the central nervous system. Information about light touch, deeper pressure, hot, cold, and even pain is collected by special receptors in the skin. Type of Sensory Receptors in the Skin There are about half dozen different receptors in the layers of the kin. Some of them will only respond to one kind of sensation. Ex. the pacinian corpuscles are just beneath the skin and respond to changes in pressure. There are nerve endings that wrap around the ends of the hair follicles, a fact people may be well aware of when they tweeze their eyebrows. These nerve endings are sensitive to both pain and touch. There are free nerve endings just beneath the uppermost layer of the skin that respond to changes in temperature and to pressure but not pain. There are pain nerve fibers in the internal organs as well as receptors for pressure. How else would people have stomach or intestinal pain? Or know when to pee? There are different types of pain. There are receptors that detect pain in the organs, a type of pain called visceral pain. But pain sensations in the skin, muscles, tendons, and joints are carried on large nerve fibers and are called somatic pain. Somatic pain is the body’s warning system that something is being, or is about to be, damaged and tends to be sharp and fast. Another type is slow and is normally felt in sches. This somatic pain acts as a reminder system that something has already been damaged. There are rare conditions in which people are born without the ability to feel pain (CIPA) PAIN: GATE-CONTROL THEORY The best explanation for how the sensation of pain works is called gate-control theory. In this theory, the pain signals must pass through a “gate” located into the spinal cord. The activity of

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