now let’s talk about our other senses…. our essential question how do we get information from...
TRANSCRIPT
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Now let’s talk about our other senses…
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Our Essential Question
• How do we get information from our world, not using our eyes or ears?
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Other Senses: Taste
(Gustation)
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Taste• Taste is a chemical sense
• The receptor cells for taste are the taste buds
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Taste
• ~ 7,500 taste buds • Food dissolves (saliva) on these
receptors TRANSDUCTION occurs• Damaged taste receptor cells
replaced within a few days to 2 weeks
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• Taste Sensations
–sweet
–sour
–salty
–bitter
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Supertasters
• People with an abundance of taste receptors
• Approximately 25% of the population– More likely women,
Asians, Africans
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Nontasters
• People with a minimum of taste receptors
• Taste with less intensity than the rest of the population
• Approximately 25% of the population
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Other Senses: Smell
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Smell
• Chemical
• Taste and smell interact Temporal lobe
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Olfactory Cells
• The chemical receptor cells for smell
• Located in the nasal passages
• Detect molecules in air
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Smell
Smell
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Time to do an Experiment
• Please get two pack of starburst
• Wait for instructions
• What did you discover??
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Other Senses: Touch
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Touch• Touch receptors are on the skin• 4 basic skin senses
–Pain, warmth, cold and pressure• skin sensations = combination of
these 4 basic senses• Somotosensory cortex
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Sensitivity of Diff Body Parts to PAIN
Most Sensitive
• Back of knees
• Neck region
• Bend of elbow
Least Sensitive
• Tip of the Nose
• Sole of foot
• Ball of thumb
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Gate-Control Theory of Pain
• Pain messages travel on one set of nerve fibers containing pain gates– The gates are open when pain is felt
• Other sensory messages go through another set of fibers– The non-pain fibers can close the pain gates
to stop the sense of pain– http://www.youtube.com/watch?
v=1VkwYcSYhs4
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Other Senses: Vestibular
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Vestibular Sense
• Sense of balance and body position
• Receptor cells: hair cells in inner ear
• Motion sickness = overstimulation
• Parietal lobe
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The last sense….
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Kinesthetic Sense
• Sense of the position and movement of individual body parts
• Receptor cells in muscles and joints
• Your leg “falling asleep”
• Parietal lobe
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Let’s Review
• Name the senses
• How many are there?
• Think again…
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The senses
1. Vision
2. Hearing
3. Tasting
4. Touching
5. Smelling
6. Vestibular
7. Kinesthetic
Now briefly describe what each one does
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How do the senses interact?
Identify the physiological features common across all
sensory systems.