Where is the muscle tissue distributed? What constitutes and therefore can be generated

The basic tissue of an animal made up of specially differentiated muscle cells. There is a small amount of connective tissue between muscle cells, capillaries and nerve fibers. Muscle cells are elongated in shape, so they are also called muscle fibers.

The cell membrane of muscle cells is called the sarcoplasm, and its cytoplasm is called sarcoplasm. Sarcoplasm contains muscle filaments, which are the material basis for muscle cell contraction. According to the morphology and distribution of muscle cells, muscle tissues can be divided into three categories:

That is, skeletal muscle, cardiac muscle, and smooth muscle. Skeletal muscles are generally attached to bones through tendons, but there are exceptions, such as the muscles in the upper esophagus and facial expression muscles, which are not attached to bones. Myocardium is distributed in the heart and forms the myocardial layer on the walls of the atria and ventricles, and is also found on the walls of large blood vessels near the heart.

Smooth muscle is found in the visceral and blood vessel walls. The muscle fibers of skeletal muscle and cardiac muscle have striated lines, also known as striated muscles. Smooth muscle fibers are not striated.

Musculature has contractile properties and is the driving force behind the movement of the body and limbs, as well as physiological processes such as digestion, respiration, circulation, and excretion in the body**. The contraction of skeletal muscles is governed by the will and belongs to the voluntary muscles. Cardiac muscle and smooth muscle innervated by autonomic nerves are involuntary muscles.

Skeletal muscle fibers are generally long cylindrical, about 1 40 mm long and 10 100 μm in diameter. Each muscle fiber is surrounded by a thin layer of connective tissue called endomysium. It is composed of several to dozens of muscle fibers to form muscle bundles, and there is a thick connective tissue called perimysium outside the muscle bundle, which is composed of many muscle bundles to form a muscle, and the connective tissue on its surface is called epimysium, that is, deep fascia.

There are abundant blood vessels in all connective tissues, and there is a capillary network in the endomysium that surrounds the muscle fibers. There are afferent and efferent nerve fibers in the connective tissue of muscles, all of which are myelinated nerve fibers. The nerves that are distributed in the walls of blood vessels in the muscles are autonomic nerves and are unmyelinated nerve fibers.

Smooth muscle fibers are generally fusiformal, about 20 300 microns long, about 6 microns in diameter, the smooth muscle of the uterus during pregnancy can reach 500 microns long, and the nucleus is oblong-oval, located in the basal membrane of muscle fibers, attached to the muscle membrane. Smooth muscles are often arranged in bundles or layers. According to the way their nerve endings are distributed, they can be divided into two categories:

One is a few, the surface of muscle cells has nerve endings distributed, and its endings are swelled in the shape of a rosary, while most other smooth muscle cells do not have nerve endings, these cells transmit information through the suture connection of smooth muscle cells, so that nerve impulses spread, most of the smooth muscles in the body such as the smooth muscles distributed in the digestive tract and uterine wall belong to this category. The other type is the majority, where there are nerve endings distributed on the surface of each muscle cell, and each cell is directly controlled by the nerve, such as the pupillary sphincter and the open muscle of the eye. In addition, there are intermediate types.

In addition to its contractile function, smooth muscle also has the function of producing intercellular stoma.

The myocardial fibers are cylindrical in shape and have a diameter of about 15 to 20 microns. The myocardial fibers have branches that are connected to each other in a web, so the myocardium can contract at the same time. The physiology of the heart muscle is characterized by its ability to contract automatically and rhythmically.

A tissue made up of specially differentiated muscle cells.

It is widely distributed in the human body. According to the different morphology, function and location, it can be divided into three categories: the first type is the bony arm muscles attached to the bone.

The muscle fibers of this muscle can be seen under the microscope with light and dark striations, so they are also called striated muscles; And because this muscle can contract with the person's consciousness, it is also called a voluntary muscle. The second type is the visceral muscles that surround the walls of certain internal organs and blood vessels. This muscle fiber can be seen neatly and smoothly under the microscope, which is also called smooth muscle; And because this muscle is not governed by consciousness, it is also called involuntary muscle.

The third type is the myocardium that forms the walls of the heart. The muscles we usually refer to are the muscles of the bones. There are more than 600 bones and muscles in the whole body, about 40% of body weight

Various movements of the human body, such as walking, holding, swallowing, expression, etc.; The activities of various organs in the body, such as respiration, circulation, excretion, gastrointestinal peristalsis, etc., are all completed by muscle movements. Muscle movement relies on the contraction of muscle fibers, and muscles themselves have the ability to synthesize muscle proteins with nutrients, and the energy released by muscle protein decomposition becomes the driving force for muscle fiber contraction. Physical activity promotes muscle development and strengthening.

1. Skeletal muscle, muscle cells, contraction, diastole, exercise.

2. Nutritional tissue.

3. Vacuoles. 4. Organs.

Muscle tissue is mainly composed of muscle cells and can be divided into three types: smooth muscle, skeletal muscle, and cardiac muscle.

1. Muscle: Muscle is mainly composed of muscle tissue.

Muscle tissue is made up of muscle cells (muscle fibers) and connective tissue.

Muscle cells are elongated and fibrous in shape, so muscle cells are often called myofibers. The cells are rich in myomeral proteins, which are composed of fine and coarse myomerang. The cephalic muscles can be divided into two parts: the facial muscles (expression muscles) and the masticatory muscles.

The trunk muscles can be divided into dorsal, pectoral, abdominal, and diaphragm. The lower limb muscles are divided into hip muscles, thigh muscles, calf muscles, and foot muscles according to their location, all of which are thicker than upper limb muscles, which are related to weight support, upright and walking.

Second, the division of muscle and stuffy tissue structure.

The differences in muscle structure and function of the human body can be divided into three types: smooth muscle, cardiac muscle and skeletal muscle

1. Skeletal muscle: It is the type of muscle that can be seen and felt. When a gymper increases muscle strength through exercise, it is the skeletal muscles that are being exercised.

Skeletal muscles are attached to bones and occur in pairs: one muscle moves the bone in one direction and the other in the opposite direction.

These muscles usually contract at will, meaning that when they want to contract, the nervous system tells them to do so. Skeletal muscles can be contracted in a single contraction for a short time (twitching) or for a long time (tetanus).

2. Smooth muscle: found in the digestive system, blood vessels, bladder, respiratory tract and the uterus of women.

Smooth muscles are able to pull the hail nucleus for a long time and maintain tension. These muscles contract involuntarily, meaning that the nervous system automatically controls them without human consideration. For example, the muscles in the stomach and intestines perform tasks every day, but people generally don't notice it.

3. Myocardium: Only found in the heart, its biggest feature is endurance and firmness.

It can stretch in a limited way like smooth muscles or contract with force like skeletal muscles. It is just a twitching muscle and does not contract voluntarily. There are three basic forms of joint movement caused by muscle contraction and traction of bones, which act like a lever device.

1. Balance the lever movement, the fulcrum is between the key point and the force point, such as the head and head down movement carried out by the atlanto-occipital joint.

2. Labor-saving lever movement, the focus of which is bent between the fulcrum and the force point, such as the movement of the ankle joint when starting to raise the heel.

3. Speed lever movement, the force point is located between the key point and the fulcrum, such as the movement of the elbow joint when lifting heavy objects.

Every skeletal muscle is made up of a muscle, abdomen, and tendons....There are three types: smooth muscle, cardiac muscle, and skeletal muscle.

It is divided into skeletal muscle, smooth muscle, and cardiac muscle.

1. Skeletal muscles are distributed in the trunk and limbs, controlled by somatic nerves and consciousness, and contract quickly and forcefully, but they are easy to fatigue.

2. Smooth muscle is mainly distributed in the walls of internal organs and blood vessels, innervated by splanchnic nerves, not controlled by consciousness, and has automaticity, which can automatically produce excitation and contraction.

3. Myocardium, in the heart wall, also exists at the proximal end of the large blood vessels, is innervated by splanchnic nerves, is not controlled by consciousness, has slow contractions, rhythmic and long-lasting, and is not easy to fatigue.

4. Muscle tissue is divided into three categories: skeletal muscle, cardiac muscle, and smooth muscle. Skeletal muscle is innervated by somatic nerves as voluntary muscles, and cardiac and smooth muscles are innervated by autonomic nerves as involuntary muscles.

Skeletal muscle contraction, stretching bone around the axis of motion of the joint, or keeping the body in a certain position with the whole body, is the power source of the locomotor system. The myocardium is distributed in the proximal segment of the heart and the large blood vessels adjacent to the heart, and the myocardial contraction has an automatic rhythm, slow and long-lasting, not easy to fatigue, and maintains the orderly beating of the heart. Smooth muscle, also known as visceral muscle, contracts slowly and persistently, and the contraction causes the movement of internal organs and blood vessels.

The muscles of the human body can be divided into smooth muscle, cardiac muscle, and skeletal muscle according to their distribution, structure, and functional properties.

Smooth muscle: hollow nature mainly distributed in internal organs.

The organs, as well as the walls of blood vessels, contract slowly and persistently.

Myocardium: It is unique to the heart and constitutes the main part of the heart wall, and the contraction is rhythmic.

Skeletal muscles: Mainly distributed in the body, they contract quickly and forcefully, but they are easily fatigued.

Cardiac muscle and skeletal muscle belong to striated muscle, myocardium and smooth muscle are innervated by the internal organs, not controlled by the will, belong to involuntary muscle, skeletal muscle is innervated by the somatic nerve, directly subject to the control of human will, so it is called voluntary muscle or simply muscle.