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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/unesp/361010
Title: 
Hair cells from bullfrog saccule B: video showing hair bundle deflection
Author(s): 
Language: 
nau
Description: 
  • Presente a live hair cell from the inner ear of a bullfrog (Rana catesbeiana), deflected by a glass probe. Protruding from the apical surface of each hair cell is a hair bundle, comprising 50-60 stereocilia and a single kinocilium (identified by its bulbous ending) to which the probe is attached. Stereocilia have stiff cores of cross-linked actin filaments and taper where they insert into the apical surface, so that they remain straight and pivot at their bases. Stereocilia are held together near their tips, in a manner that prevents separation but allows sliding. The molecular basis of this sliding adhesion is not understood. Extending between the tip of each stereocilium and the side of its taller neighbor is an extracellular 'tip link,' not visible in light microscopy. Deflection of a hair bundle towards the tallest stereocilia increases tension in tip links and pulls open mechanosensitive ion channels in the tips of stereocilia. Ion influx then depolarizes the hair cell to create a neural signal. scale: tallest stereocilia are 8 micrometers in height
  • Componente Curricular::Educação Superior::Ciências Biológicas::Biologia Geral
Issue Date: 
  • Jun-2007
  • 20-May-2009
  • 20-May-2009
  • 20-May-2009
  • 2-Oct-2008
Publisher: 
The American Society for Cell Biology, ASBC Image & Video Library
Keywords: 
  • Cell
  • Educação Superior::Ciências Biológicas::Biologia Geral
Notes: 
To show hair cell from the inner ear of a bullfrog (Rana catesbeiana), deflected by a glass probe
Credits: 
Duração: 4 s. Original resource created in 1991. To visualize this source its necessary the instalation of Quick time. Available at: <http://www.apple.com/pt/quicktime/>
Source: 
http://objetoseducacionais2.mec.gov.br/handle/mec/10308
URI: 
http://acervodigital.unesp.br/handle/unesp/361010
Rights: 
You may use the Images only for research and educational purposes in an educational institution. Images may be stored on a network server, hard drive or removable media, but only while this Agreement remains in effect. All of the Images you use must be accompanied by a notice stating, "© [Date and Author's or Owner's Name]. All rights reserved. Reprinted under license from The American Society for Cell Biology." The notice shall appear with the Images or on a credits page. "Educational purposes" means (i) non-commercial instruction or curriculum based teaching by educators to students at nonprofit educational institutions, (ii) planned non-commercial study, investigation or research directed toward making a contribution to a field of knowledge, or (iii) presentation of research findings at non-commercial peer conferences, workshops or seminars, but in any event there must be express written permission from ASCB before an Image can be published. "Educational institutions" include K-12 schools, colleges and universities. Libraries, museums, hospitals, research institutes and other nonprofit organizations are considered educational institutions when they engage in nonprofit instructional, research or scholarly activities for educational purposes.
Type: 
vídeo
Appears in Collections:MEC - Objetos Educacionais (BIOE) - OE

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