Victor Forge
Muscle composition refers to the structure and arrangement of muscles in the human body. There are three main types of muscles: skeletal, smooth, and cardiac. Skeletal muscles are attached to bones and enable movement, while smooth muscles are found in internal organs like the digestive tract and blood vessels, causing involuntary movements. Cardiac muscle is unique to the heart, contracting and relaxing without our conscious control. Skeletal muscles are composed of muscle fibres, connective tissue, and fat, with each muscle fibre being a single cylindrical cell. These fibres are bundled together, surrounded by connective tissue sheaths called the endomysium, perimysium, and epimysium, which provide support and protection. The composition of muscle fibres varies depending on species, breed, gender, age, physical activity, and other factors. Maintaining muscle health involves regular exercise and a balanced diet, including protein, carbohydrates, and fat.
| Characteristics | Values |
|---|---|
| Number of muscles in the human body | 600 |
| Types of muscles | Skeletal, Smooth, Cardiac |
| Skeletal muscle composition | 90% muscle fibres, 10% connective and fat tissues |
| Connective tissue | Endomysium, Perimysium, Epimysium |
| Muscle disorders | Weakness, Pain, Paralysis |
| Muscle pain treatment | RICE method (Rest, Ice, Compression, Elevation) |
| Nutrients for muscle building | Protein, Carbohydrates, Fat |
| Muscle-strengthening exercises | Lifting weights, Resistance bands, Everyday chores |
| Skeletal muscle functions | Maintaining posture, Producing movement, Thermogenesis, Metabolism |
| Muscle contraction | Caused by the brain sending a message to the motor neurons |
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What You'll Learn
Skeletal muscle composition
Skeletal muscle is the most common type of muscle in the human body, comprising approximately 40% of body weight and containing 50-75% of all body proteins. Skeletal muscles are attached to bones by tendons and allow us to perform a wide range of movements and functions. They are under voluntary control, meaning we can decide how and when they work.
Skeletal muscle is composed of bundles of muscle fibres called myofibers, which contain several myofibrils. Each myofibril is made up of actin (thin filaments), myosin (thick filaments), and support proteins. The arrangement of actin and myosin gives skeletal muscle its microscopic striated appearance and creates functional units called sarcomeres. When viewed under a microscope, these sarcomeres appear as transverse bands, giving skeletal muscle its striated appearance.
The connective tissue in skeletal muscle is divided into the endomysium, perimysium, and epimysium. The endomysium is the innermost layer, surrounding each individual muscle fibre. The perimysium surrounds bundles of muscle fibres, and the epimysium surrounds the muscle as a whole. The connective tissue consists of cells and an extracellular matrix (ECM) that primarily consists of a composite network of collagen fibres wrapped in a matrix of proteoglycans (PGs).
The development of skeletal muscle begins during embryogenesis, when the paraxial mesoderm undergoes stepwise differentiation to generate muscle tissue. The paraxial mesoderm differentiates into somites, which then differentiate into dermomyotome and sclerotome under the influence of regulatory factors such as Wnt, Shh, and BMP4 proteins. The dermomyotome then further differentiates to form the skeletal muscles in the body, with the dorsomedial aspect forming back muscles and the ventrolateral aspect forming muscles of the body wall.
To maintain healthy skeletal muscles, it is important to engage in regular exercise and consume a nutritious, balanced diet. Muscle-strengthening exercises, such as lifting weights or using resistance bands, are recommended for major muscle groups at least twice a week. Additionally, adequate protein, carbohydrates, and fat are necessary for building and maintaining skeletal muscle mass.
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Connective tissue
Muscle composition refers to the structure and arrangement of muscles in the body. It involves the combination of muscle fibres, connective tissues, and fat tissues. Connective tissue is one of the basic tissue types in the body, comprising various tissues that connect, support, and help bind other tissues. It can be categorised into two primary types: connective tissue proper and specialised connective tissue.
Specialised connective tissues include adipose, cartilage, bone, blood, and reticular tissues. These tissues are diverse as they are made up of different specialised cells and ground substances. Reticular fibres, a type of collagen fibre, are present in basement epithelial tissue, adipose cells, Schwann and muscle cells, lymphoid tissue, and the endothelium of hepatic sinusoids.
Within skeletal muscle, there are three distinct ECM structures that make up the intramuscular connective tissue (IMCT): the epimysium, perimysium, and endomysium. Each individual muscle is surrounded by the epimysium, which is an outer ECM layer. The perimysium is a continuous network of connective tissue structures that divides the muscle internally into fascicles or bundles of muscle fibres. The endomysium is a collagenous basement membrane that connects each muscle cell to other muscle cells at a molecular level.
IMCT plays a critical role in muscle development, growth, and function. It acts as a scaffold for muscle fibre development and growth and as a carrier for blood vessels and nerves to the muscle cells. The variability in the amount and composition of IMCT between different muscles contributes to variations in their active and passive mechanical properties.
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Muscle fibres
Skeletal muscle fibres are classified into two types: type 1 and type 2. Type 1 fibres utilize oxygen to generate energy for movement and have a higher density of mitochondria, giving them a darker appearance. Type 2 fibres can be further divided into subtypes: Type 2A, which can also use oxygen to generate energy but contains less mitochondria, and Type 2B, which does not use oxygen and instead stores energy for short bursts of movement. Type 2B fibres have the lowest amount of mitochondria and appear white.
The number of slow-twitch (type 1) and fast-twitch (type 2) fibres in the body varies between individuals and is determined by genetics. People who excel at endurance sports tend to have a higher number of slow-twitch fibres, while sprinters have a higher number of fast-twitch fibres. Training can influence both types of fibres, improving power in slow-twitch fibres and endurance in fast-twitch fibres. However, it is important to note that the number of muscle fibres cannot be increased through exercise. Muscles grow larger through muscle cell growth, the addition of new protein filaments, and the contribution of satellite cells.
The connective tissue surrounding muscle fibres and fibre bundles is a loose connective tissue composed of cells and an extracellular matrix (ECM) of collagen fibres and proteoglycans (PGs). This connective tissue is essential for enclosing and supporting muscle fibres, fascicles, and the muscle as a whole.
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Muscle abnormalities
Congenital Muscle Abnormalities
Some individuals are born with congenital muscle abnormalities, where muscles or groups of muscles are not properly developed. These abnormalities can vary in severity and may be an isolated issue or part of a broader syndrome. In some cases, congenital muscle abnormalities can lead to muscle weakness, affecting the individual's strength and mobility.
Neuromuscular Disorders
Neuromuscular disorders are a common type of muscle abnormality that affects the nerves controlling voluntary muscles and the communication of sensory information back to the brain. When nerve cells (neurons) become unhealthy or die, it leads to a breakdown in communication between the nervous system and muscles. As a result, muscles weaken and atrophy (waste away). Neuromuscular disorders can be inherited or caused by spontaneous gene mutations or immune system disorders. They can cause muscle weakness, twitching, cramps, aches, and pains. Currently, there is no cure for neuromuscular disorders, but treatments such as medications, physical therapy, and occupational therapy can help manage symptoms and enhance patients' quality of life.
Muscular Dystrophy
Muscular dystrophy is a group of inherited diseases that cause muscle weakness and the wasting away of muscle tissue. There are multiple types of muscular dystrophy, each affecting different muscles and progressing at different rates. The most common type is Duchenne muscular dystrophy, followed by Becker muscular dystrophy. These conditions lead to a loss of strength, increasing disability, and possible deformity.
Muscle Weakness
Muscle weakness can arise from problems with the nervous system, impairing the transmission of messages between the brain and muscles. It is often associated with upper or lower motor neuron dysfunction or conditions such as myasthenia gravis, which affects the nerve-muscle junction. Stroke, spinal cord compression, and multiple sclerosis can also lead to muscle weakness. In such cases, a doctor will assess muscle strength and may order additional tests to identify the underlying cause.
Pain and Injury
Muscle pain may indicate an injury or infection. Minor muscle injuries can often be treated using the RICE method (Rest, Ice, Compression, and Elevation). However, extreme and unexplained muscle pain, especially with difficulty breathing, requires immediate medical attention.
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Muscle pain and treatment
Muscle pain, or myalgia, is usually temporary and not serious. However, it can sometimes be a symptom of a long-term condition. It can be caused by muscle stress from overuse, including repetitive strain injuries, or traumatic injuries, including sports injuries and accidents. If the pain is localised, it is more likely to be related to an injury or recent stress on that muscle group. If the pain is diffuse, it is more likely to be caused by a disease.
If you are experiencing muscle pain, you should first determine whether it is serious. If you are experiencing extreme and unexplained muscle pain, especially if you are also experiencing difficulty breathing, seek medical attention immediately. You should also seek medical attention if your pain is accompanied by fever, chest pain, muscle weakness, numbness, loss of bladder control, or worsening pain.
If your pain is not serious, there are several treatments you can try at home. If your pain is caused by tension or physical activity, you can lower your risk of developing muscle pain in the future by stretching before and after engaging in physical activity, incorporating a warm-up and cool-down into your exercise routine, staying hydrated, engaging in regular exercise, and stretching regularly if you work in an environment that puts you at risk of muscle strain.
You can also try complementary therapies, such as massage, acupuncture, and meditation, for additional relief and relaxation. For pain caused by injuries or overuse, you can rest the affected area, apply a cold compress to relieve inflammation, and take a pain reliever, such as ibuprofen. After 3 days, switch to applying heat to the affected area.
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Frequently asked questions
Muscles are made of thousands of elastic fibres bundled tightly together. Each bundle is wrapped in a thin, transparent membrane called a perimysium. Each muscle fibre is made of blocks of proteins called myofibrils, which contain myoglobin and other molecules that provide the oxygen and energy required for muscle contraction.
There are three main types of muscle: skeletal, smooth, and cardiac. Skeletal muscles are attached to bones and allow movement. Smooth muscles are located in various internal structures such as the digestive tract, uterus, and blood vessels. Cardiac muscle is specific to the heart.
Skeletal muscle is the largest body-composition component in humans, accounting for more than 40% and 30% of total body mass in men and women, respectively. It is responsible for maintaining an upright posture and producing movement. Skeletal muscle consists of muscle fibres, connective tissue, and fat.
To maintain healthy muscles, it is important to get regular exercise and eat a nutritious, balanced diet. Muscle-strengthening exercises for the major muscle groups are recommended at least twice a week. Protein, carbohydrates, and fat are necessary for building muscles.
