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The human body is estimated to have around 600 to 700 muscles, which are responsible for movement, posture, and balance. The study of muscles, or myology, is a complex field that involves understanding the different types of muscles, their functions, and how they work together with other systems in the body. Smooth muscle, skeletal muscle, and cardiac muscle are the three primary types, each with distinct characteristics and functions. Smooth muscle, also known as visceral muscle, is found in the walls of internal organs and blood vessels, aiding in digestion and blood flow. Skeletal muscles, attached to bones by tendons, enable voluntary movements and support posture. Cardiac muscle, unique to the heart, facilitates rhythmic contractions, pumping blood throughout the body. Recent studies have also explored the link between muscle activity and nerve growth, suggesting potential exercise-based therapies for nerve repair. Learning about muscles can be challenging due to their vast number and intricate functions, but interactive resources, diagrams, and quizzes can make the process more engaging and effective.
| Characteristics | Values |
|---|---|
| Number of muscles in the human body | 600-700 |
| Muscle composition | Thousands of small fibres woven together |
| Types of muscle tissue | Visceral, cardiac, and skeletal |
| Function | Movement, posture, and balance |
| Involuntary muscles | Visceral and cardiac |
| Voluntary muscles | Skeletal |
| Muscle movement | Contraction of muscle fibres |
| Muscle studies | Quizzes, labelled diagrams, and interactive 3D anatomy models |
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What You'll Learn
Muscle anatomy
The human body has over 600 muscles, which help us do everything from breathing to running. These muscles are attached to the bones of the skeletal system and make up roughly half of a person's body weight. Each muscle is a discrete organ constructed of skeletal muscle tissue, blood vessels, tendons, and nerves.
There are three types of muscle tissue: visceral, cardiac, and skeletal. Visceral muscle, also known as smooth muscle due to its smooth appearance under a microscope, is the weakest of all muscle tissues. It is found inside organs like the stomach, intestines, and blood vessels, and serves to move substances through the organ. Cardiac muscle, on the other hand, is responsible for pumping blood throughout the body and is found only in the heart. Cardiac muscle tissue, along with visceral muscle, is considered an involuntary muscle as it cannot be controlled consciously.
The skeletal muscle, the third type of muscle tissue, attaches to the bone by tendons and together they produce all body movements. Skeletal muscle fibres are crossed with a regular pattern of fine red and white lines, giving them a distinctive striated appearance. The individual bundles of muscle fibres in a skeletal muscle are known as fasciculi, and they are wrapped together by connective tissue sheaths. The outermost connective tissue sheath surrounding the entire muscle is called the epimysium, while the innermost sheath surrounding individual muscle fibres is called the endomysium.
Many muscles derive their names from their anatomical region or the bones they are attached to. For example, the rectus abdominis and transverse abdominis are found in the abdominal region, while the tibialis anterior is named after the tibia bone it is attached to.
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Muscle movement
The human body has over 600 muscles, which are pieces of soft tissue that help us move, breathe, swallow, and survive. Muscle movement is facilitated by muscle contractions, which are based on two variables: length and tension. Tension within a muscle can be produced without any change in its length, such as when holding a dumbbell or a sleeping child in your arms. Once a muscle contraction terminates, muscle relaxation occurs, with the muscle fibres returning to a low-tension state.
There are three types of muscles: skeletal, cardiac, and smooth. Skeletal muscles are attached to bones and give the body structure and strength. There are around 700 skeletal muscles, which make up about half of a person's body weight. They are responsible for the movement of the human body. Cardiac muscle comprises the walls of the heart and allows blood to be pumped through the vasculature. Smooth muscle is found throughout the blood vessels, gastrointestinal tract, bronchioles, uterus, and bladder.
The prime mover, or agonist, is the muscle that provides the primary force driving a movement. An antagonist muscle opposes the prime mover by providing resistance or reversing a movement. Synergists are muscles that assist the prime mover, while stabilisers keep bones immobile when needed, such as when keeping your posture sturdy.
The term "smooth muscle" is often used to describe visceral muscle, which has a smooth, uniform appearance under a microscope. This contrasts with the banded appearance of cardiac and skeletal muscles. Cardiac muscle tissue stimulates itself to contract and is considered autorhythmic or intrinsically controlled.
Recent studies have shown that exercising muscle can promote nerve growth at the cellular level. This could inform exercise-related therapies for repairing damaged nerves and restoring mobility for those with neurodegenerative diseases.
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Muscle types
The human body has over 600 muscles, which make up about half of a person's body weight. These muscles are responsible for movement and facilitating various functions that help keep us alive. There are three types of muscles in the human body: skeletal, smooth, and cardiac.
Skeletal muscles are attached to the bones of the skeletal system via tendons. They are the most common type of muscle tissue in the body and consist of highly elongated, multinucleate, non-branching cells arranged in parallel. Each skeletal muscle is made up of thousands of bundled muscle fibres, which, when viewed under a microscope, form a striped pattern. This is why skeletal muscles are also referred to as striated muscles. Skeletal muscles are voluntary, meaning that their movement can be controlled consciously. They are involved in various movements, including those that occur at a subconscious level, such as breathing.
Smooth muscle, also known as visceral muscle, is found in many different organ systems of the body, including the digestive, reproductive, and respiratory systems. Unlike skeletal muscles, smooth muscles do not form a striped pattern and are thus non-striated. They are controlled by the unconscious part of the brain, making them involuntary muscles.
Cardiac muscle tissue is found in the heart and is responsible for pumping blood throughout the body. It cannot be controlled consciously and is, therefore, an involuntary muscle. The cells of cardiac muscle are X or Y-shaped and are connected by intercalated discs, which help them resist high blood pressure and the strain of pumping blood.
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Muscle injuries
Muscle strains, or pulled muscles, are one of the most common types of muscle injuries. They occur when the muscle fibres tear, either suddenly or gradually. Acute muscle strains are typically sports injuries caused by sudden movements like sprinting, twisting, or jumping. They can also result from collisions or tackles in contact sports such as football, rugby, and basketball. On the other hand, chronic or overuse injuries develop over time due to repetitive movements or overtraining without adequate rest.
The severity of muscle strains can vary from mild to severe. A grade 1 strain involves a partial tear of a few muscle fibres, while a grade 3 strain results in a complete tear of the muscle. In most cases, pulled muscles can be treated at home with rest, ice, compression, and elevation. However, severe tears may require medical care or even surgery to stitch the muscle back together.
Contusions are another type of muscle injury, resulting from compressive forces, often occurring in contact sports. Lacerations, bruises, and degenerative diseases, such as muscular dystrophies, can also cause muscle injuries. Bruises are caused by internal bleeding into the interstitial tissues, leading to pain and, in some cases, more severe complications. Muscle cramps are sudden, involuntary muscle contractions that can also cause discomfort.
Understanding and studying muscle injuries is crucial for developing effective treatments and rehabilitation strategies. Recent studies have also explored the link between muscle injuries and nerve damage, suggesting that stimulating muscle tissue may help repair damaged nerves and restore mobility.
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Muscle and nerve interaction
The muscular system is responsible for the movement of the human body. There are about 700 named muscles in the human body, making up roughly half of a person's body weight. Each of these muscles is a discrete organ constructed of skeletal muscle tissue, blood vessels, tendons, and nerves.
The nerve-muscle interaction was first recognized by Galen in the second century. He observed that the contraction of a muscle only occurred if the nerves supplying that muscle were intact. He concluded that the shortening of a muscle was controlled by the central nervous system, while the extension of a muscle could occur without innervation. Galen's theory of "animal spirits" posited that nerves transported these spirits to the muscles, causing contraction. However, with the historical discovery of Galvani, it was found that muscles could be stimulated electrically, and nerves and muscles were themselves sources of electrical energy.
Today, it is well-established that nerves conduct electrically, and the transmission from nerve to muscle is mediated by chemicals. In vertebrates, this chemical is acetylcholine (ACh). While the concept of "spirits" has been replaced, the idea of substances transported through nerves that control muscle function remains relevant. These substances are now understood to regulate various muscle characteristics and maintain structural integrity.
Recent studies have further advanced our understanding of nerve-muscle interaction. Research by MIT has shown that exercising muscle can promote nerve growth at the cellular level. This discovery could have significant implications for repairing damaged nerves and restoring mobility in individuals with neurodegenerative diseases. The study found that regular exercise stimulated the grafted muscle to produce biochemical signals that promote nerve and blood vessel growth. Additionally, this research highlights the potential of targeted muscle stimulation as a therapeutic approach for nerve injuries.
Furthermore, nerve-muscle interaction is integral in the development of skeletal muscle. The absence of skeletal muscle during development can lead to the sequential ablation of motor neurons in the spinal cord and brain. Reinnervation and the depletion of adult satellite cells can also impact the regeneration and morphology of the neuromuscular junction (NMJ). The NMJ is a critical player in the physiopathologic interplay between muscle and nerve, facilitating their functional dialogue and survival.
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Frequently asked questions
Muscles are pieces of soft tissue throughout your body that help you do everything from holding your body still to running a marathon. There are over 600 muscles in the human body, and they are made of thousands of small fibres woven together.
There are three types of muscle tissue: visceral, cardiac, and skeletal. Visceral muscle is found inside organs like the stomach and intestines, and is also known as smooth muscle. Cardiac muscle is found in the heart, and skeletal muscle is attached to the bones of the skeletal system.
The study of muscles is called myology.
