Difference Between Skeletal Muscle and Cardiac Muscle

Thekey difference在骨骼肌和心肌之间skeletal muscle is under voluntary control while cardiac muscle is under involuntary control.

Muscle tissue是动物体内存在的四种组织之一。它具有收缩的能力，以促进身体的不同部位的运动。因此，肌肉组织是收缩组织. It originates from the mesoderm layer of embryonic germ cells. Based on the function, there are three main types of muscle tissues as skeletal muscle, cardiac muscle andsmooth muscle.Among three different types, smooth muscle and cardiac muscle work involuntarily since their contraction occurs without conscious thought. In contrast, skeletal muscle works voluntarily as their contraction occurs with conscious thought. Moreover, cardiac muscle is present in the heart walls of vertebrates while skeletal muscle facilitates movements of our body by anchoring to the bones by肌腱.

内容

1.Overview and Key Difference
2.What is Skeletal Muscle
3.什么是心肌
4.Similarities Between Skeletal Muscle and Cardiac Muscle
5。并排比较 - 表格形式的骨骼肌与心肌
6。概括

What is Skeletal Muscle?

骨骼肌是由称为肌腱的胶原纤维束固定在骨骼上的横纹肌肉。骨骼肌完全在体细胞神经系统的自愿控制下工作。它促进了身体的运动，面部表情，姿势和其他自愿运动。心肌细胞或肌肉细胞是骨骼肌的基本结构单位。肌肉细胞被组织成肌肉纤维。肌肉纤维是由肌细胞融合形成的长，圆柱形的多核细胞。

Figure 01: Skeletal Muscle

肌肉纤维含有由厚和薄的肌膜组成的肌原纤维。细丝是肌动蛋白丝，而厚细丝是肌球蛋白丝。在显微镜视图下，这两个细丝在骨骼肌中显示为独特的带状图案。除这两种外，肌肉纤维还含有肌钙蛋白和肌动蛋白，这对于肌肉收缩至关重要。肌动蛋白和肌球蛋白被排列在一个称为肌膜的重复单元中。它是肌肉纤维的基本功能单元，负责横纹外观。此外，肌动蛋白和肌球蛋白的相互作用负责肌肉收缩。

什么是心肌？

Cardiac muscle is one of the three types of muscle tissue present in the walls of the heart, especially in the myocardium of the heart. Similar to skeletal muscle, cardiac muscle is also a striated muscle. But, it works involuntarily unlike the skeletal muscle. Cardiomyocytes or cardiac muscle cells are the cells that make the cardiac muscle. These cells have one, two or rarely three or four nuclei. Cardiac muscle cells depend on the blood supply to deliver oxygen and nutrients as well as to remove the waste products. Due to the coordinated contraction of heart muscle cells, blood circulation takes place in the circulatory system. For efficient functioning of the heart, cardiac muscles have a large number of mitochondria, numerous myoglobins, and good blood supply.

Difference Between Skeletal Muscle and Cardiac Muscle

Figure 02: Cardiac Muscle

心脏的肌肉也表现出横条纹的lternating thick and thin filaments. Under the electron microscope view, actin filaments appear as thin bands while myosin filaments appear as thick and darker bands. Cardiac muscle fibres are mostly branched. T-tubules in the cardiac muscle are larger, broader and run along the Z-Discs. Intercalated discs connect cardiac myocytes to an electrochemical syncytium and are responsible for force transmissions during muscle contraction. T-tubules play an important role in excitation-contraction-coupling (ECG).

骨骼肌和心肌之间有什么相似之处？

Skeletal muscle and cardiac muscle are two of the three types of muscles present in our body.
Both are striated muscles.
Therefore, they contain myofibrils and sarcomeres.
Moreover, they are packed into highly regular arrangements of bundles.
两种肌肉类型都包含大量线粒体。

What is the Difference Between Skeletal Muscle and Cardiac Muscle?

Skeletal muscle is the type of muscle attached to the skeleton by tendons while cardiac muscle is the muscle found in the walls of the heart. Thus, this is the key difference between skeletal muscle and cardiac muscle. Furthermore, skeletal muscle works under the voluntary control of the somatic nervous system while cardiac muscle works under involuntary control. Moreover, skeletal muscles are present in almost all part of the animal body while cardiac muscles are present only in the myocardium of the heart. This is another important difference between skeletal muscle and cardiac muscle.

The below infographic summarizes the difference between skeletal muscle and cardiac muscle.