肌原纤维和肉瘤之间的差异

这关键区别在肌原纤维和肉瘤之间肌原纤维是肌肉的收缩单位，而肉瘤是肌原纤维的小重复单元。

骨骼肌由肌原纤维组成。它们是从心肌细胞。骨骼肌的重复单位是肌原纤维。同样，肌原纤维的重复单元是肌膜。肌节在肌肉收缩和放松过程中起作用。它们在运动过程中活跃，在久坐条件下活跃。

CONTENTS

1。概述和关键差异
2。什么是肌原纤维
3。什么是肉瘤
4。肌原纤维和肉瘤之间的相似之处
5。Side by Side Comparison – Myofibrils vs Sarcomeres in Tabular Form
6。Summary

什么是肌原纤维?

肌原纤维是肌肉细胞的结构单位。它们是杆状结构。肌细胞产生肌原纤维。肌发生是形成肌肉组织和肌原纤维的过程。它发生在胚胎开发期间。不同的蛋白质，包括肌动蛋白，肌球蛋白和钛，形成肌原纤维。但是，肌动蛋白和肌球蛋白在肌原纤维中起主要的结构作用。肌原纤维还具有将主蛋白结合在一起的辅助蛋白。

肌原纤维中有两种类型的肌膜。它们是薄而厚的肌膜。细丝是肌动蛋白丝，而厚细丝是肌球蛋白丝。他们安排重复的单元，称为肌膜，该单元在骨骼和心肌收缩过程中起作用。因此，肌原纤维的关键功能是借助钙，肌钙蛋白和肌动蛋白促进肌肉的收缩。它通过神经冲动的传播发生。ATP对于此过程至关重要。因此，肌肉收缩是一个消耗的过程。

什么是肉瘤?

Sarcomeres are the repeating units of myofibrils. They structurally provide the striated appearance to the skeletal as well as心肌。观察有两个重要的蛋白质纤维that slide past each other during relaxation and contraction. They are the actin filaments and the myosin filaments. In the sarcomere, the actin filaments form thin bands, and the myosin filaments form thick bands. They are only present in cardiac and skeletal muscles and are absent in smooth muscles.

Each sarcomere in the myofibril is separated from each other at the Z line. The Z line is the anchorage point for actin filaments. Next to the Z line, the I band is present. Here, the I band only consists of thin filaments. It does not have any superimposed thick filaments. The A band lies next to the I band. The A band only consists of thick filaments as well as thin filaments. Following the A band, the H zone is the zone that consists only of thick filaments. The M line within the H zone forms cross-connecting elements of the cytoskeleton. Thus, the main function of the sarcomere is the facilitate muscle contraction and relaxation in skeletal and cardiac muscles.

What are the Similarities Between Myofibrils and Sarcomeres?

• Both consist of proteins, such as actin and myosin.
• 它们在肌肉收缩中很重要。
• Both require Calcium and ATP for the process of contraction.
• Moreover, they are important in movement and locomotion.

What is the Difference Between Myofibrils and Sarcomeres?

肌原纤维是肌肉细胞的结构单元，而肉瘤是肌原纤维的结构单元。因此，这是肌原纤维和肉瘤之间的关键区别。同样，尽管它们执行相同的功能，但在电子显微镜下外观的肌原纤维和肉瘤之间存在差异。

此外，肌原纤维概括为所有三种类型的肌肉细胞，而肉瘤仅在心脏和骨骼肌中发现。此外，肉瘤的存在在这些肌肉中提供了横纹外观。

这below infographic presents more information regarding the difference between myofibrils and sarcomeres.

Summary – Myofibrils vs Sarcomeres

肌原纤维是形成肌肉的肌肉纤维的结构和功能单位。在骨骼和心脏肌肉中，肉瘤形成交叉条纹，它们也是肌原纤维的重复单元。他们一起，借助钙，ATP和其他结合蛋白来执行肌肉收缩和放松的过程。他们的作用是神经源的。因此，这总结了肌原纤维和肉瘤之间的差异。

参考：

1.“肌肉细胞结构和生理学。”Biol 237课程 - 肌肉细胞和肌肉生理，在这里可用。

图片提供：

1。“Blausen 0801 SkeletalMuscle” By BruceBlaus. When using this image in external sources it can be cited as:Blausen.com staff (2014). “Medical gallery of Blausen Medical 2014”. WikiJournal of Medicine 1 (2). DOI:10.15347/wjm/2014.010. ISSN 2002-4436. – Own work（CC由3.0）通过下议院维基梅迪亚
2.用户：Sameerb - EN：WP；作者用户：英语WP中的Sameerb，版权免费使用）下议院维基梅迪亚