Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 1956 Jul 25;2(4 Suppl):157-62.
doi: 10.1083/jcb.2.4.157.

The ultrastructure of striated muscle at various sarcomere lengths

D SPIRO

The ultrastructure of striated muscle at various sarcomere lengths

D SPIRO. J Biophys Biochem Cytol. .

Abstract

1. Rest and equilibrium length muscle sarcomeres are composed of thin filaments (actin) which traverse the sarcomeres from the Z membranes up to the H band; at this level the filaments are considerably thicker and less numerous. 2. Shortening of muscle is associated with a transformation of thin into thick filaments in the A band. 3. These observations are discussed in terms of interaction of actin and myosin to form a supercoiled structure as the basis of contraction.

PubMed Disclaimer

References

    1. J Exp Med. 1951 Jul 1;94(1):9-20 - PubMed
    1. Am J Physiol. 1951 Oct;167(1):276-83 - PubMed
    1. J Exp Med. 1952 Mar;95(3):285-98 - PubMed
    1. Am J Anat. 1953 Jul;93(1):61-105 - PubMed
    1. Nature. 1953 Sep 19;172(4377):530-2 - PubMed