Concept in Definition ABC

The contractile organ that can be found and is part of the body structure of any human or animal is known as muscle.. The human body has approximately 650 muscles, which are made up of muscle tissue, that is, they are surrounded by a connective tissue membrane known as fascia.

The muscles They are the organs of greater adaptability that man has, that is, its content and form are modified more than any other. For example, a severe atrophy of one of these can return quietly and thanks to the training physical.

According to their nature or origin, we find three types of muscles, the striated or skeletal that make up 40% of the human body, the smooth or visceral and the cardiac, the latter two being the least proportion occupy in the body, about 10%.

Striated muscles make up the skeletal muscles of the body and are controlled by will. Its contraction turns out to be much faster than that of the smooth ones, for example and therefore they suffer much faster than these the effects of fatigue. The contractile unit of these is called the sarcomere and is made up of different bands and lines.

On the other hand, the smooth muscles, which bear this name because their fibers do not have striae unlike the ancestors, are those that form the walls of the viscera and are not under the dominion and control of the will. The contraction in this type of muscle is much longer lasting and its function is very important, since most of these are located in the gastrointestinal tract.

And the heart muscle, as its name already allows us to glimpse, is present only in the heart, being its striated and modified nature and involuntary control. Its contraction will be regulated by the Nervous systemAutonomous.

Among the main functions of the muscles we find the following: provide joint stability, provide protection, help in maintaining posture, production from movement, generation of mechanical energy for the transformation of the chemical energy, inform us about the physiological state of our body, for example, at the request of renal colic, the pains that the smooth muscle associated with this function will suffer, it gives the body a sense of posture and its position in space thanks to the nerve endings that muscle tissue has, it provides heat and stimulates blood vessels and lymphatics.