St._John's_University_Advanced_Human_Anatomy_and_Physiology_I_BIO_3100_Lecture_Sliding_Filament_Theo

This preview shows page 1 out of 1 page.

St. John’s UniversityDr. Emanuel J. PepitoneAdvanced Human Anatomy and Physiology I BIO 3100: Muscle ContractionSliding Filament Theory of Muscle Contraction ReviewWhen a muscle contracts,actinslides past themyosinfilaments bringing theZ-linescloser together, hence,shorteningthe sarcomere. The myofilamentsremain thesamelength, however, theI and H bands disappear. The A bandsremain the same width and theZ-linesare pulled closer to each other, and theentire sarcomere isshortenedinlength. When theaction potentialreaches thesarcolemma, it passes down to thetransverse tubules, which is aninvagination of thesarcolemma. The T-tubules have a close association with thesarcoplasmic reticulum (SR). The AP now passes over the T-tubules, reachesthe SR, and
End of preview. Want to read the entire page?

Upload your study docs or become a

Course Hero member to access this document

Term
Spring
Professor
Vladimir Poltrasky
Tags
Dr Emanuel J Pepitone

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture