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myofibril

American  
[mahy-uh-fahy-bruhl, -fib-ruhl] / ˌmaɪ əˈfaɪ brəl, -ˈfɪb rəl /

noun

Cell Biology.
  1. a contractile fibril of skeletal muscle, composed mainly of actin and myosin.


Etymology

Origin of myofibril

First recorded in 1895–1900; myo- + fibril

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Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Both the Z disc and the M line hold myofilaments in place to maintain the structural arrangement and layering of the myofibril.

From Textbooks • Jun. 9, 2022

Thick filaments occur only in the A band of a myofibril.

From Textbooks • Jun. 9, 2022

A myofibril is composed of many sarcomeres running along its length; thus, myofibrils and muscle cells contract as the sarcomeres contract.

From Textbooks • Jun. 19, 2013

The sarcomere itself is bundled within the myofibril that runs the entire length of the muscle fiber and attaches to the sarcolemma at its end.

From Textbooks • Jun. 19, 2013

The coordinated contractions of many sarcomeres in a myofibril leads to contraction of the entire muscle cell and ultimately the muscle itself.

From Textbooks • Apr. 25, 2013

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