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Other Senses

Other Senses. Chapter 4 Section 4. Smell. Substances are detected through receptor neurons in each nostril. These receptors send information about the odors to the brain via the olfactory nerve . Dogs use 7 times as much of their cerebral cortex for smell as people do.

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Other Senses

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  1. Other Senses Chapter 4 Section 4

  2. Smell • Substances are detected through receptor neurons in each nostril. These receptors send information about the odors to the brain via the olfactory nerve. • Dogs use 7 times as much of their cerebral cortex for smell as people do. • Without the sense of smell, you would not be able to taste as much as you do. • Sense of smell adapts rapidly and we lose awareness

  3. Taste • Taste is sensed through receptor neurons in the taste buds of the tongue. • Flavor of food is vey complex and also relies on temperature, odor, and texture. • Taste cells may be damaged by hot foods or scraping your tongue, but reproduce rapidly (usually a week) and it is very rare for someone to lose their sense of taste • 4 taste qualities- sweet, salty, sour, bitter • Some are more sensitive to different tastes that others • Dogs taste sweetness and cats do not

  4. Skin Senses A combination of pressure, temperature, and pain. Pressure- sensory receptors around the roots of hair cells fire when the skin is touched and other structures beneath the skin are sensitive to pressure.

  5. Skin Senses Temperature – normal body temperature is 98.6 receptors just beneath the skin help control temperature and adapt to increases and decreases in temperature occur.

  6. Skin Senses Pain – Not all areas of the body are equally sensitive to pain. The more pain receptors in a certain area the more sensitive that area is. prostaglandins – chemicals that help the body transmit pain messages to the brain (ibuprofen, aspirin, etc. curbs production of prostaglandins) Gate theory- rubbing or scratching an injured area transmits sensation to the brain that compete with the pain messages for attention and neurons cannot get their pain messages to the brain. Phantom limbs – feeling pain or sensations in limbs that are no longer present. This is activated by neural circuits that have memories connected with the amputated limb.

  7. Body Senses • Vestibular Sense – tells you whether you are physically upright without having to use your eyes. Also makes you aware of falling and change in acceleration. • Sensory organs in your ears monitor position and gravity

  8. Kinesthesis – informs one of the position and motion of their body. • Sensory organs in the joints, tendons, and muscles send this information to the brain

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