Dominic Stone
The human body contains over 600 muscles, which are responsible for everything from moving the body to breathing and keeping us alive. The muscular system is responsible for the movement of the human body. There are three types of muscle tissue: visceral, cardiac, and skeletal. Visceral muscle is found inside organs like the stomach, intestines, and blood vessels. Skeletal muscles are attached to the bones of the skeletal system and make up roughly half of a person's body weight. Cardiac muscle makes up the middle layers of the heart, which is a hard-working muscle that beats thousands of times a day to keep us alive.
| Characteristics | Values |
|---|---|
| Number of muscles in the human body | 600-700 |
| Muscle tissue types | Visceral, cardiac, skeletal, smooth |
| Skeletal muscle composition | Skeletal muscle tissue, connective tissue, nerve tissue, blood or vascular tissue |
| Skeletal muscle fibres | Thousands of fibres, red and white, striped |
| Skeletal muscle shape | Cylindrical |
| Skeletal muscle size | Vary from tiny strands to large masses |
| Skeletal muscle functions | Movement, eating, breathing, maintaining posture and balance, protecting vital organs |
| Cardiac muscle functions | Rhythmic contractions of the heart, pumping blood through the cardiovascular system |
| Smooth muscle functions | Involuntary control, found in walls of blood vessels, urinary bladder, intestines, stomach |
| Voluntary muscles | Skeletal |
| Involuntary muscles | Cardiac, smooth |
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What You'll Learn
The heart is a muscle
The human body contains more than 600 muscles, which help us do everything from moving our bodies to breathing and staying alive. The muscular system is responsible for the movement of the human body. There are three types of muscle tissue in the human body: visceral, cardiac, and skeletal.
Cardiac muscle, or myocardium, makes up the middle layers of the heart. It is only found in the heart and does not exist anywhere else in the body. Cardiac muscle fibres are striated, or striped, like skeletal muscles, but unlike smooth muscles. Cardiac muscle fibres contract and relax involuntarily, without conscious thought, to pump blood through the cardiovascular system.
Like any other muscle in the body, the heart needs to be exercised, nourished, and rested, and protected from toxins. Physical activity, a healthy diet, and managing stress can all contribute to maintaining a healthy heart and cardiovascular system.
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Skeletal muscles
The health and strength of skeletal muscles are important to maintain. Skeletal muscles are susceptible to various conditions, from mild injuries to serious myopathies. In addition, muscle mass and strength tend to decrease with age, and certain factors like inactivity, malnutrition, and disease can accelerate this process, leading to muscle atrophy or sarcopenia.
To maintain muscle health, individuals can focus on building and strengthening their skeletal muscles through exercise and physical activity. This is particularly important for older adults, as muscle mass decreases with age. Additionally, a well-balanced diet that provides sufficient calories and nutrients can support muscle health and overall body function.
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Involuntary muscles
The heart is an example of an involuntary muscle. It beats thousands of times a day to keep you alive. Cardiac muscles are striated and found on the wall of the heart, contracting and relaxing at regular intervals. The muscles in and around your organs, like the heart, move involuntarily to keep your body working properly.
Other examples of involuntary muscles include those found in the stomach and intestines, which help with digestion. Involuntary muscles are also present in the walls of the digestive system, blood vessels, bronchi, uterus, and bladder. They perform different functions such as enabling the body to maintain posture and body position, stabilize and strengthen joints, and produce heat to maintain normal body temperature.
Diseases that affect the involuntary muscles include occlusion (blockage) of the coronary arteries caused by atherosclerosis and/or thrombosis. Problems can lead to myocardial infarction (heart attack), depending on the severity of the condition. Certain viruses can also lead to myocarditis (inflammation of the myocardium).
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Visceral muscles
The human body is made up of more than 600 muscles that help us do everything from moving our bodies to breathing and staying alive. The muscular system is responsible for the movement of the human body. There are three types of muscle tissue: visceral, cardiac, and skeletal.
Visceral muscle tissue, or smooth muscle, is tissue associated with the internal organs of the body, especially those in the abdominal cavity. It is found inside organs like the stomach, intestines, bladder, uterus, and blood vessels. The weakest of all muscle tissues, visceral muscle makes organs contract to move substances through the organ. Visceral muscle is controlled by the unconscious part of the brain, and is therefore known as an involuntary muscle, which cannot be directly controlled by the conscious mind.
Smooth muscle is grouped into two types: single-unit smooth muscle, also known as visceral smooth muscle, and multi-unit smooth muscle. Most smooth muscle is of the single-unit type, and is found in the walls of most internal organs. In single-unit smooth muscle, a single cell in a bundle is innervated by an autonomic nerve fiber (myogenic). An action potential is propagated through neighbouring muscle cells due to the presence of many gap junctions between the cells. This allows single-unit bundles to form a syncytium that contracts in a coordinated fashion, making the whole muscle contract or relax.
Smooth muscle is found in the walls of hollow organs, including the digestive tract, the urinary tract, and the respiratory, reproductive, and lymphatic systems. Smooth muscle is also found in the eyes, where the ciliary muscles, iris dilator muscle, and iris sphincter muscle are types of smooth muscles.
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Smooth muscles
Smooth muscle is one of the three main types of muscle in the human body, along with skeletal and cardiac muscles. It is found throughout the body and serves a variety of vital functions, ranging from blood pressure and circulation to vision and digestion. Smooth muscle movements are involuntary and occur without conscious thought.
Smooth muscle consists of thick and thin filaments that are not arranged into sarcomeres, resulting in a non-striated pattern. It has greater elastic properties than striated muscle and can be classified into two types: single-unit and multi-unit. Single-unit smooth muscle comprises multiple cells connected through connexins, allowing for synchronous contraction. On the other hand, multi-unit smooth muscle has finer control, with each cell receiving its synaptic input.
One of the key roles of smooth muscle is passage width control. It manages the width of passages inside the body, including blood and lymph vessels, airways, and the digestive tract. Smooth muscle can flex together to push substances through tubelike passages. For example, in the gastrointestinal system, it helps with motility and nutrient collection. Additionally, in the urinary system, smooth muscle aids in toxin removal and electrolyte balance.
Smooth muscle is also involved in gatekeeping functions. While most muscles remain relaxed and flex only when needed, smooth muscle in sphincters, such as the bladder or anus, stays flexed and only relaxes when necessary. Smooth muscle in the ciliary body of the eye controls how the eyes focus by pulling on zonules. It also regulates pupil dilation and constriction. Furthermore, smooth muscle contractions in the uterus occur during labour.
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Frequently asked questions
Skeletal muscles are attached to bones and are therefore not contained within organs. However, they are considered organs of the muscular system.
Cardiac muscles make up the middle layers of the heart and are therefore contained within the heart.
Smooth muscles are found in the walls of blood vessels, the urinary bladder, the intestines, and the stomach.
Visceral muscles are found inside organs like the stomach, intestines, and blood vessels.
