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Taste, Smell and more….
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After quiz have journals ready
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Students will be able to… Demonstrate their understanding of the senses
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What is your favorite food to eat? Why? Explain with detail.
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How do you know where sound is coming from? Difference in time it takes to reach each ear
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What’s the difference? Key Terms Low pitch v. medium to high pitch Nerve impulse rate to brain v. vibration on the basilar membrane
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Where is it located? Above the cochlea – inner ear What do the semicircular canals do? Filled with fluid that moves in response to movement of head Hair Cells respond to the movement What is its function? Maintaining balance
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What is it? Sensory mismatch between info form vestibular system (head movement and eye sees no movement) What are the symptoms? Nausea, dizziness What is Meniere’s disease Malfunction of canals – viral infection of the inner ear Symptoms – spinning and buzzing sounds What is Vertigo? Malfunction of canals Dizziness and nausea
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Taste test…. Explain everything that happens when you are tasting the candy in your journal. Include all of your senses at work and anything that comes to mind…including memories.
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Taste Tongue 5 basic tastes – Sweet, salty, sour, bitter, umami Surface of Tongue Chemicals breakdown stimuli into molecules Mix with saliva and run into trenches on surface Stimulate taste buds Taste buds Look like onions Produce nerve impulses that reach parietal lobe Brain transforms into sensations of taste Replaced every 10 days Flavor Combo of taste and smell
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Stimulus Smell volatile substance (molecules in air) Olfactory cells Receptors in 1 inch square patch of tissue in uppermost part of nasal passages Covered in mucus which dissolves molecules and stimulates cells Cells trigger nerve impulses that travel to brain which interprets the smell
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Sensation memories We can identify as many as 10,000 different odors Adaptation goes into effect Functions To intensify the taste of food Warn of dangerous foods Elicit strong memories/feelings
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Pressure, temperature and pain Half-dozen miniature sensors that are receptors Change the pressure into nerve impulses and send to brain
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Skin Outer layer Thin film of dead cells, no receptors Different shapes and functions Hair Middle layer Free nerve endings wrap around base of each hair follicle Follicles fire with a burst of activity when first bent Sensory adaptation Free nerve endings Near bottom of skin Nothing protecting them Pacinian corpuscle In fatty layer Largest touch sensor Highly sensitive to touch Responds to vibrations and adapts quickly
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What causes pain? unpleasant sensory and emotional experience from tissue damage, thoughts, beliefs, or environmental stressors results from many different stimuli
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How does the mind stop pain? Gate control theory of pain Nonpainful nerve impulses compete with pain impulses in trying to reach the brain Creates a bottleneck or neutral gate Shifting attention or rubbing an injured area decreases the passage of painful impulses Result: pain is dulled
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Chemicals produced by the brain and secreted in response to injury or severe physical or psychological stress similar to those of morphine Brain produces in situations that evoke great fear, anxiety, stress, or bodily injury as well as intense aerobic activity
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Connected to pain centers in brain Acupuncture Thin needles inserted in various points on body’s surface – twirl needle 10 – 20 mins reduction in pain for some
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Identify and memorize the definitions of perception and sensation On your worksheet label each image with an P if it is more of a Perception or an S if it is more of a Sensation. If it is more of a perception explain what the illusion is and what is producing it.
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Essay – will count as 25 points towards your combined quizzes, worth 75pts, to make a test grade out of 100. No Reading for homework…stepping away from book next week! SEE YOU MONDAY!
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