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- Electrical_tuning abstract "Electrical tuning is a mechanism by which vertebrates such as frogs and reptiles, which lack a long cochlea, discriminate sound. Mammals have long cochleae, and are able to distinguish different sounds by mechanisms such as mechanical tuning, in which the stiffness and length of hair cells’ stereocilia makes a given cell best suited to respond to a certain type of stimulus. The basilar membrane of animals with long cochleae also vibrates at different locations along the membrane in response to different frequency sounds. Since the reptilian ear lacks a long cochlea, electrical tuning provides an alternative mechanism for perceiving differences in sound.With a combination of voltage-gated calcium channels and calcium sensitive K+ channels, the cells set up an oscillation in voltage and oscillate in response to a depolarizing stimulus. Ca++ enters the cell and depolarizes it, opening K+ channels which allow K+ to leave and hyperpolarize the cell. Since the exit of K+ from the cell is delayed, the voltage increases, but then with the exit of the K+ the cell overshoots the membrane potential and hyperpolarizes. Different cells have different delays for K+ leaving and thus the voltage oscillates at different frequencies. The delays can be as short as 0.7 ms or as long as 150 ms, whereas the Ca++ entry always occurs within about 1 ms (Fettiplace, 1987). Thus by varying the length of delay for K+ to leave, cells' ion concentrations can oscillate at specific frequencies. Cells with higher oscillating frequencies respond best to higher-frequency sounds, while those with lower frequencies respond best to lower frequency ones. Which cells resonate best with a given sound tells the brain what the frequency of the sound is. Hair cells that respond to high frequency stimuli send information to specific neurons, and the information remains segregated in the brain. Thus, information about sound frequency is preserved, rather than being lost as it would if all information from different hair cells converged on the same neuron or group of neurons.".
- Electrical_tuning wikiPageExternalLink 2460.
- Electrical_tuning wikiPageID "3915756".
- Electrical_tuning wikiPageLength "2805".
- Electrical_tuning wikiPageOutDegree "24".
- Electrical_tuning wikiPageRevisionID "364241971".
- Electrical_tuning wikiPageWikiLink Basilar_membrane.
- Electrical_tuning wikiPageWikiLink Brain.
- Electrical_tuning wikiPageWikiLink Calcium_in_biology.
- Electrical_tuning wikiPageWikiLink Category:Auditory_system.
- Electrical_tuning wikiPageWikiLink Cell_(biology).
- Electrical_tuning wikiPageWikiLink Cochlea.
- Electrical_tuning wikiPageWikiLink Concentration.
- Electrical_tuning wikiPageWikiLink Depolarization.
- Electrical_tuning wikiPageWikiLink Frequency.
- Electrical_tuning wikiPageWikiLink Frog.
- Electrical_tuning wikiPageWikiLink Hair_cell.
- Electrical_tuning wikiPageWikiLink Mammal.
- Electrical_tuning wikiPageWikiLink Mechanical_tuning.
- Electrical_tuning wikiPageWikiLink Millisecond.
- Electrical_tuning wikiPageWikiLink Oscillation.
- Electrical_tuning wikiPageWikiLink Potassium.
- Electrical_tuning wikiPageWikiLink Potassium_channel.
- Electrical_tuning wikiPageWikiLink Reptile.
- Electrical_tuning wikiPageWikiLink Sound.
- Electrical_tuning wikiPageWikiLink Stereocilia.
- Electrical_tuning wikiPageWikiLink Stimulus_(physiology).
- Electrical_tuning wikiPageWikiLink Vertebrate.
- Electrical_tuning wikiPageWikiLink Voltage.
- Electrical_tuning wikiPageWikiLink Voltage-dependent_calcium_channel.
- Electrical_tuning wikiPageWikiLink Voltage-gated_calcium_channel.
- Electrical_tuning wikiPageWikiLinkText "Electrical tuning".
- Electrical_tuning wikiPageWikiLinkText "electrical tuning".
- Electrical_tuning hasPhotoCollection Electrical_tuning.
- Electrical_tuning wikiPageUsesTemplate Template:Auditory_system.
- Electrical_tuning subject Category:Auditory_system.
- Electrical_tuning hypernym Mechanism.
- Electrical_tuning type Organisation.
- Electrical_tuning comment "Electrical tuning is a mechanism by which vertebrates such as frogs and reptiles, which lack a long cochlea, discriminate sound. Mammals have long cochleae, and are able to distinguish different sounds by mechanisms such as mechanical tuning, in which the stiffness and length of hair cells’ stereocilia makes a given cell best suited to respond to a certain type of stimulus.".
- Electrical_tuning label "Electrical tuning".
- Electrical_tuning sameAs m.0b6m_v.
- Electrical_tuning sameAs Q5357750.
- Electrical_tuning sameAs Q5357750.
- Electrical_tuning wasDerivedFrom Electrical_tuning?oldid=364241971.
- Electrical_tuning isPrimaryTopicOf Electrical_tuning.