other senses: taste (gustation) module 9: sensation
Post on 14-Dec-2015
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Taste• On average, adults have about 7,500 taste buds.
• These receptor cells are located in the tongue and in the mouth.
• When food dissolves on these receptors, TRANSDUCTION occurs
• Damaged taste receptor cells are replaced within a few days to 2 weeks
Taste• Substances dissolved by saliva
activating the taste buds
• Cheeks, roof of mouth, throat, tongue
Nontasters
• People with a minimum of taste receptors
• Taste with less intensity than the rest of the population
• Approximately 25% of the population
Smell• Smell is a chemical sense.
• Olfactory cells in the upper nasal passages detect molecules in the air.
• Taste and smell interact to produce flavor.
Touch
• Touch receptors are on the skin
• Four basic skin senses are
–Pain, warmth, cold, and pressure
• All skin sensations are a combination of these four basic senses
Sensitivity of Diff body to PAIN
Most Sensitive
• Back of knees
• Neck region
• Bend of elbow
Least Sensitive
• Tip of the Nose
• Sole of foot
• Ball of thumb
Gate Control Theory
•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.
Kinesthetic Sense•The system for sensing
the position and movement of individual body parts
•Relies on receptor cells from the muscles and joints
•One’s leg “falling asleep” is a disruption of the kinesthetic sense
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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