フィットネスの勧め 語句解説    

語句解説 - か行

 

筋原線維 ( きんげんせんい、英:myofiber

 

 筋原線維とは

 

 
   

 以下は筋肉の構成要素を表した簡単な図となる。

 

 以下は「Wikipedia」の解説文となる。

「A myofibril (also known as a muscle fibril) is a basic rod-like unit of a muscle cell.[1] Muscles are composed of tubular cells called myocytes, known as muscle fibers in striated muscle, and these cells in turn contain many chains of myofibrils. They are created during embryonic development in a process known as myogenesis.
Myofibrils are composed of long proteins including actin, myosin, and titin, and other proteins that hold them together. These proteins are organized into thick and thin filaments called myofilaments, which repeat along the length of the myofibril in sections called sarcomeres. Muscles contract by sliding the thick (myosin) and thin (actin) filaments along each other.」

 

【 区 分 】

 筋原線維には縦方向に2つのの区分がある。

1
A帯暗帯

A band

電子顕微鏡で見たときに暗く見える部分

2
I帯明帯

I band

電子顕微鏡で見たときに明るく見える部分