1. First I will discuss the first the functions as a whole, one it helps to produce movement which is the muscle contraction and help you to respond quickly.
2. Also, they help to maintain posture and this is because they make tiny adjustments which help us maintain our body posture or seated up.
3. These muscles help to maintain the stabilization of joints because the muscles pulling on bones causes movements and helps to strengthen and stabilize them.
4. Last it helps to generate heat because they contract which helps to maintain normal body temperature and it's the most important muscle type for generating the heat.
Now just for some individual structures of what they are:
Muscle- it consists of hundreds to thousands of muscle cells, plus connective tissue wrappings, blood vessels, and nerve fibers
Fascicle- is a portion of the muscle and is a discrete bundle of muscle cells, segregated from the rest of the muscle by a connective tissue sheath
Muscle fiber- is a elongated multinucleate cell; which has a banded appearance.
Myofibril or fibril- is a rodlike contracile element; they occupy most of the muscle cell volume; bands of adjacent myofibrils are aligned; and composed of sarcomeres arranged end to end.
Sarcomere- it's the contractile unit, composed of myofilaments made up of contractile proteins
Myofilament or filament- there are two types thick and thin the thick contain bundled mysoin molecules; and thin contain actin molecules.
This is an important part of the human body to me because of those top four functions: produce movement, maintain posture, stabilize joints, and help to maintain temperature. To me I would have to say it's extremely important without this there would be no life for us because not having movement would be the worst filling in the world and that's why to me.
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