Detailed Information About Muscle Relaxants
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The function of the muscles. Muscles are the organs of the body, consisting of muscle tissue capable of Contracting under the influence of nerve impulses. They are an active element of the musculoskeletal system, as they provide a variety of movement of man in space, maintaining balance, breathing movements, reducing the walls of internal organs, voice, etc. the structure of the muscles. Muscle consists of bundles of striated muscle fibers connected by loose connective tissue into bundles of the first order. They, in turn, are combined into bundles of the second order, etc. In the end, the muscle bundles of all orders combined connective sheath, forming the muscle belly. Connective tissue layer between the muscle bundles at the ends of the abdomen, go to the tendon part of the muscle attached to the bone. During a contraction is the shortening of the muscle belly and the convergence of its ends. Thus, the reduced muscle via tendon pulls the bone, which acts as a lever. So things are a variety of movements.
Each mists is holistic (individual) body having a certain shape, structure and function, development and position in the body. Muscles are richly supplied with blood vessels and nerves. Each movement involves several muscles. Muscles acting together in one direction and causing a similar effect, called synergists, and performing the opposite movement —antagonists. For example, a flexor of the elbow joint is the biceps muscle of the arm (biceps) and extensor — triceps (triceps)- Contraction of muscles-flexors of the elbow joint accompanied by a relaxation of the muscles-extensors. However, at a constant stress on the joint (for example, if you hold the weights horizontally at arm's length) of muscles-flexors and extensors of the elbow joint are not as antagonists, but as synergists. Thus, the action of the muscles cannot be reduced to only one function, as they are multifunctional. Because every movement involves the muscles of both one and the other group, our movements precise and smooth.
The scope of basic movements and the action on the joint of the following types of muscles: flexors and extensors, adductor and abductor, rotator, lift and lower etc. there are also facial, masticatory and respiratory muscles.
Nervous regulation of activity of the muscles. In most movements involve many muscles, and the contraction and relaxation of various muscle groups occurs in a specific order and with a certain force. This consistency of movement is called coordination. It is the nervous system. Skeletal muscles are innervated by somatic division of the nervous system. To every muscle fits one or more nerves, penetrating in its thickness and branching into many small branches, which reach the muscle fibers. Nerves through communication of the muscles with the Central nervous system, which regulates any motor acts (walking, running, food movements, etc.) and long-term muscle tension — the tone of supporting a certain position of the body in space. The muscles is reflex in nature. Muscle reflex can be triggered with stimulation of receptors located in the muscle or in the tendons or irritation visual, auditory, olfactory, tactile receptors.
In the regulation unconditional reflex movements involved the cerebellum. It coordinates movement, regulation of muscle tone, helps maintain balance and body posture. In lesions of the cerebellum its regulatory of motor functions are impaired.
Contracting, the muscle acts on the bone as a lever and produces mechanical work. For the implementation of the working muscle requires energy, which is formed by decomposition and oxidation of organic substances entering into the muscle cell. The main source of energy is ATP. The blood gives your muscles nutrients and oxygen and carries away the resulting products of dissimilation (carbon dioxide, etc.). After prolonged use, comes fatigue and decreased performance of the muscles that occur due to a mismatch between blood supply and the increased need for nutrients and oxygen. In addition, fatigue occurs as a result of the processes occurring in the nervous centres.
Muscle performance depends on the size of the load and the rhythm of work. Choosing their optimal ratio, it is possible to achieve high performance of the muscles. I. M. Sechenov also found that muscle fatigue takes place, and recovers much more quickly as a result of new activities, not total inactivity. Exercise of muscles increases their mass, strength and performance. Excessive work leads to fatigue and inactivity — atrophy.
A systematic muscular activity increases the blood supply in mice and the bones to which they attach. This leads uvelicheniyu muscle mass and enhanced bone growth. Strong muscles can easily cope with the maintenance of the body in the desired position, oppose to the development of stooped posture, curvature of the spine.
Hygiene of the musculoskeletal system s. Man is born with a very flexible skeleton. Therefore, in children especially careful to monitor the posture of the child, the posture of the pupil at the Desk. Underdeveloped muscles and incorrect posture of the child can lead to the development of spinal curvature, stoop, that disrupt the normal activity of the organs of the chest cavity and digestion. To prevent flat feet (flattening of the arch of the foot) is not in the active growth period of a man wearing tight shoes, and also long-term to wear high-heeled shoes. On the formation of the musculoskeletal system of the body have a positive impact an active lifestyle, outdoor games, regular physical training and sports.