Intracellular calcium movements during excitation–contraction coupling in mammalian slow-twitch and fast-twitch muscle fibers

Author:

Baylor Stephen M.1,Hollingworth Stephen1

Affiliation:

1. Department of Physiology, University of Pennsylvania, Philadelphia, PA 19104

Abstract

In skeletal muscle fibers, action potentials elicit contractions by releasing calcium ions (Ca2+) from the sarcoplasmic reticulum. Experiments on individual mouse muscle fibers micro-injected with a rapidly responding fluorescent Ca2+ indicator dye reveal that the amount of Ca2+ released is three- to fourfold larger in fast-twitch fibers than in slow-twitch fibers, and the proportion of the released Ca2+ that binds to troponin to activate contraction is substantially smaller.

Publisher

Rockefeller University Press

Subject

Physiology

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