竹森 重 ９‐３１／９‐３１
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2 成城 経済研究 第１ ９ ５号 ２ ０ １ ２年１月 働きかけたりするためにこの骨格筋の収縮を利用します 骨格筋は私たち の頭脳とともに 私たち動物をして動物たらしめる欠くことのできない装 置であり このことが骨格筋を私たちにとってそもそも魅力的な存在にし ています 筋節の構造に見られますように 骨格筋は収縮を実現する主役のアクチ ンとミオシンという二種類のタンパク質を高い濃度でお行儀よく配列し 筋肉の長さ方向に縮もうとする強い力を発生しながら 許されれば実際に 筋肉の長さを縮ませます 長さ変化する素材として私たちの身の回りには ゴムやバネがありますが しっかりした力を支えられるゴムやバネは長さ 変化をさせにくく 伸び縮み自由なゴムやバネが支える力は頼りないこと をご存じでしょう 骨格筋はゴムやバネとは全く趣の異なる筋節構造のお かげで 力強さと自由な長さ変化とを両立させる性質を備えています ど 図１ 骨格筋細胞中の筋節構造の電子顕微鏡写真 ウシガエル縫工筋 図の一つの 筋節の長さは一ミリメートルの１０ ０ ０分の２ ５ ２ ５ミクロン に相当する １０
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