Do Now
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Transcript of Do Now
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DO NOW
• Get into a group of 3 with the people who have the same Case # as you on their Do Now paper.
• Read the article and summarize it as a group. Choose someone to speak for your group!
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OBJECTIVES
• Identify and explain the different types of sensory receptors.• Explain referred and phantom pain.• Compare and contrast acute and chronic pain.
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SPECIAL SENSES
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PHANTOM PAIN
• The sensation of pain in a limb that has been amputated.• Causes aren’t completely understood• damaged nerve endings, scar tissue at the site of the
amputation and the physical memory of pre-amputation pain in the affected area
http://www.youtube.com/watch?v=YL_6OMPywnQ
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DO NOW
• What is phantom pain?• What causes it?• What is mirror therapy?• How else could someone alleviate this pain?
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OBJECTIVES
• Identify and explain the different types of sensory receptors.• Explain referred and phantom pain.• Compare and contrast acute and chronic pain.
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PHANTOM PAIN
• http://www.youtube.com/watch?v=hlQZmNlPdHQ
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RECEPTORS & SENSATIONS
Sensation• formed based on the sensory input from receptors• how brain interprets it
• Projection • Brain sends the sensation back to its point of origin• person can pinpoint the area of stimulation
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RECEPTIVE FIELDS
• Remember the 2 point discrimination in the lab? • Which part of your body had a larger receptive field?
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SENSORY ADAPTATION
• Before reading this sentence, could you feel your clothes on your skin? • The ability to ignore unimportant stimuli is called
sensory adaptation.
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RECEPTOR CATEGORIES
• Somatic senses • touch, pressure, pain
Specialized senses
smell, taste, hearing, equilibrium, vision
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SOMATIC RECEPTORS
• Chemoreceptors• Thermoreceptors• Photoreceptors• Mechanoreceptors• Pain receptors (Nociceptors)
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CHEMORECEPTORS
• respond to changes in chemical concentrations• Ex: Monitor CO2 levels in blood and pH
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THERMORECEPTORS
• Respond to changes in temperature
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THERMORECEPTOR ACTIVITY
• Place your pointer finger on your right hand in cold water and the same finger on your left hand in warm water. • Leave them in there for 1 minute• Now place them both in the room temperature
water.•
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PHOTORECEPTORS
• Responds to light• Rods- respond to light• Cones- respond to colors
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PHOTORECEPTOR ACTIVITY
• Hold the ends of a pencil, one in each hand. Hold them horizontally facing each other at arms-length from your body. • 2. With one eye closed, try to touch the end of
the pencils together. • 3. Now try with two eyes.• What did you experience?
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MECHANORECEPTORSFree nerve endings• common in epithelial tissues• simplest receptors• sense itchingMeissner’s corpuscles• abundant in hairless portions of
skin; lips• detect fine touch; distinguish
between two points on the skinPacinian corpuscles• common in deeper subcutaneous
tissues, tendons, and ligaments• detect heavy pressure and
vibrations
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PAIN RECEPTORS
• “Nociceptors”- • found on free nerve endings • Respond to tissue damage
Pain receptor clip: http://www.nlm.nih.gov/medlineplus/ency/anatomyvideos/000054.htm
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ACUTE VS. CHRONIC PAIN
• Acute pain fibers: • Relatively thin, myelinated• Rapid impulse conduction, causing sharp pain
• Chronic pain fibers:• Thin, unmyelinated• Conduct impulses slowly, produce a dull aching sensation
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REFERRED PAIN
• may occur due to sensory impulses from two regions following a common nerve pathway to brain • Ex:• Someone experiencing
a heart attack may feel pain in their left shoulder
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REVIEW
• What receptors detect deep pressure?• What is the difference between acute and chronic
pain?• Where do you have the most receptive fields?
**Monday- bring your books and notes to class! We are going to start reviewing for midterms.