Linked Life Data

14324996

Source:http://linkedlifedata.com/resource/pubmed/id/14324996

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:dateCreated
1965-11-1
pubmed:abstractText
Electrical and mechanical studies have been made of the deep abdominal extensor muscles, medial (DEAM) and lateral (DEAL), of crayfish and lobster. The medial muscle responds to direct (intracellular) and indirect stimulation with a transient membrane depolarization which exhibits the properties of a propagated non-decremental action potential but does not overshoot the zero level. The amplitude is about 30 mv in crayfish and 50 mv in lobster. It is followed by a fast all-or-none twitch whose duration at 20 degrees C is 30 to 50 msec. and whose developed tension is 500 gm/cm(2) or about half the tetanic value. Membrane potential is K(+)-dependent and immersion in high K(+) induces a brief transient tension rise as in other twitch-type muscles. The action potential and twitch are normal even if all external Na(+) is replaced with sucrose but vary with external Ca(++), the action potential increasing 8 to 10 mv for a twofold increase in Ca(++). The lateral muscle (DEAL) is much slower and responds to intracellular stimulation only with an electrotonic or a local response. Mechanical responses and relaxation speeds are slow with minimal duration of contraction of 0.5 to 2 seconds. Immersion in high K solutions induces large maintained tensions. Sarcomere length in the fast DEAM is uniform and about 2 micro at rest, but in the DEAL speed is less and sarcomere length is greater averaging about 4.5 micro but with a mixed population of fibers.
pubmed:commentsCorrections
http://linkedlifedata.com/resource/pubmed/commentcorrection/14324996-13062231, http://linkedlifedata.com/resource/pubmed/commentcorrection/14324996-13085338, http://linkedlifedata.com/resource/pubmed/commentcorrection/14324996-13576452, http://linkedlifedata.com/resource/pubmed/commentcorrection/14324996-13588564, http://linkedlifedata.com/resource/pubmed/commentcorrection/14324996-13588565, http://linkedlifedata.com/resource/pubmed/commentcorrection/14324996-13588566, http://linkedlifedata.com/resource/pubmed/commentcorrection/14324996-13714849, http://linkedlifedata.com/resource/pubmed/commentcorrection/14324996-13850234, http://linkedlifedata.com/resource/pubmed/commentcorrection/14324996-13940325, http://linkedlifedata.com/resource/pubmed/commentcorrection/14324996-14016765, http://linkedlifedata.com/resource/pubmed/commentcorrection/14324996-14107449, http://linkedlifedata.com/resource/pubmed/commentcorrection/14324996-14109756, http://linkedlifedata.com/resource/pubmed/commentcorrection/14324996-14165167, http://linkedlifedata.com/resource/pubmed/commentcorrection/14324996-14212147, http://linkedlifedata.com/resource/pubmed/commentcorrection/14324996-14482238
pubmed:keyword
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
OM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0022-1295
pubmed:author
pubmed:issnType
Print
pubmed:volume
48
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
919-31
pubmed:dateRevised
2010-6-22
pubmed:meshHeading
pubmed:year
1965
pubmed:articleTitle
ELECTRICAL AND MECHANICAL RESPONSES IN DEEP ABDOMINAL EXTENSOR MUSCLES OF CRAYFISH AND LOBSTER.
pubmed:publicationType
Journal Article