Dominic Stone
Muscle strains, also known as pulled muscles, are a common but painful injury. They occur when a muscle is overstretched or torn, resulting in the stretching or tearing of muscle fibres. Strains can happen in any muscle, but they are most common in the lower back, neck, shoulder, and hamstring. The severity of a strain can be classified into three grades, with Grade I being a mild strain and Grade III being a severe, complete tear that may require surgery. Most muscle strains can be treated at home with rest, ice, compression, and elevation, but severe strains may need medical attention and physical therapy.
| Characteristics | Values |
|---|---|
| Types | Skeletal, Cardiac, Smooth |
| Skeletal Muscle Tissue | Striated, elongated, multinucleate muscle cells |
| Skeletal Muscle Fibers | Red and White |
| Contraction | Controlled by the central nervous system |
| Muscle Composition | Actin, Myosin, Troponin, Tropomyosin |
| Muscle Movement | Shortening their length, pulling on tendons, moving bones closer |
| Muscle Control | Voluntary |
| Muscle Groups | Chest, Leg, Back, Abductors, Flexors, Extensors |
| Muscle Types | Type I (Slow-Twitch), Type II (Fast-Twitch) |
| Muscle Strains | Most common muscle injury |
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What You'll Learn
Skeletal muscle is voluntary and makes up 30-40% of body mass
Skeletal muscle is the most common type of muscle in the human body, comprising 30-40% of total body mass. These muscles are attached to bones by tendons, allowing for a wide range of movements and functions. Skeletal muscles are voluntary, meaning an individual can control how and when they work. They are broadly classified into two fiber types: type I (slow-twitch) and type II (fast-twitch).
Slow-twitch muscle fibres, or type I, are dense with capillaries and rich in mitochondria and myoglobin, giving the muscle tissue its characteristic red colour. They move slowly and use endurance, such as back muscles that help with posture. On the other hand, fast-twitch fibres, or type II, contract quickly and use short bursts of energy. These fibres are used for rapid movements, such as those in sprinting.
Skeletal muscles are highly oxygen-consuming tissues, and they use more calories than other organs. They are also the only type of muscle that contracts voluntarily, under the influence of the central nervous system. Skeletal muscles are essential for producing movement, sustaining body posture and position, maintaining body temperature, storing nutrients, and stabilizing joints.
Skeletal muscle disorders can manifest as muscle weakness, and there are several types of disorders that have been studied, including muscular dystrophies, congenital myopathies, inflammatory disorders, and diseases affecting the neuromuscular junction. Maintaining skeletal muscle health is important for overall health and function.
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Cardiac muscle is involuntary and only found in the heart
Muscle is a soft tissue that enables movement in the body. There are three types of muscle tissue in vertebrates: skeletal, smooth, and cardiac.
Cardiac muscle, also known as myocardium, is a type of muscle tissue that forms the heart. It is one of three types of vertebrate muscle tissues, the others being skeletal muscle and smooth muscle. It is an involuntary, striated muscle that constitutes the main tissue of the heart wall. The cardiac muscle forms a thick middle layer between the outer layer of the heart wall (the pericardium) and the inner layer (the endocardium). The endocardium is not cardiac muscle, but rather simple squamous epithelial cells that form the inner lining of the heart chambers and valves. The pericardium, on the other hand, is a fibrous sac surrounding the heart.
Cardiac muscle tissue produces involuntary movements, meaning they are automatic and a person cannot control them. The heart also contains specialized types of cardiac tissue, including "pacemaker" cells, which contract and expand in response to electrical impulses from the nervous system. These pacemaker cells control heart rate and determine how fast the heart pumps blood.
Cardiac muscle cells, or cardiomyocytes, are the contractile myocytes of the cardiac muscle. They are surrounded by an extracellular matrix produced by supporting fibroblast cells. The cardiac muscle must contract with enough force and blood to supply the metabolic demands of the entire body. Regular aerobic exercise can help strengthen cardiac muscle tissue and lower the risk of heart attack, stroke, and other cardiovascular conditions.
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Smooth muscle is also involuntary and found in the walls of organs
There are three types of muscle tissue in vertebrates: skeletal, cardiac, and smooth. Skeletal muscles are attached to the bones and allow us to perform a wide range of movements and functions. They are voluntary muscles, meaning we control how and when they work. Cardiac muscle tissue is found only in the walls of the heart and is also involuntary.
Smooth muscle plays a vital role in the cardiovascular system, where it is used in vessels to maintain blood pressure and flow. It also opens and closes airways in the lungs and plays a role in motility and nutrition collection in the gastrointestinal system. Smooth muscle is present in all organ systems and is important for medical professionals to understand due to its wide distribution and unique properties. Smooth muscle is also involved in the disease process throughout the body, with many life-saving therapies directly targeting it.
Smooth muscle can be divided into two subgroups: single-unit (unitary) and multiunit smooth muscle. Within single-unit cells, the entire bundle or sheet contracts as a syncytium, while multiunit smooth muscle tissues innervate individual cells, allowing for fine control and gradual responses. Smooth muscle differs from skeletal muscle in several ways, including its ability to be contracted and controlled involuntarily. The nervous system uses smooth muscle to regulate many of the body's subsystems without conscious thought.
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Skeletal muscle fibres are red and white and look striated
Skeletal muscles are the most common type of muscle in the body, comprising 30% to 40% of total body mass. They are attached to bones by tendons and allow us to perform a wide range of movements. Skeletal muscles are voluntary, meaning we control how and when they work.
Skeletal muscle fibres are red and white and appear striated or striped. This is due to the repeating band pattern of sarcomeres, which are all of the same length, and the transverse alignment of myofibrils across the muscle fibre. These striations were first observed by Leeuwenhoek and further studied by William Bowman in 1840, who determined that they were a property of individual fibrillae inside a muscle fibre.
The red colour of skeletal muscle fibres is due to the presence of dense capillaries, mitochondria, and myoglobin. These red muscle fibres are also known as type I or slow-twitch fibres, which contract slowly and are used for posture. On the other hand, white muscle fibres, or type II or fast-twitch fibres, contract quickly and are used for short bursts of energy.
Keeping skeletal muscles strong and healthy is important as they are vital for everyday activities such as breathing, eating, and moving our bones. Muscle strains, or pulled muscles, are a common injury that occurs when the muscle fibres are stretched beyond their limit and tear. Rest, ice, compression, and elevation are recommended treatments for muscle injuries.
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Skeletal muscles are attached to bones by tendons
Skeletal muscles are a vital part of the musculoskeletal system. They are attached to bones by tendons, which are fibrous connective tissues. Tendons come in many shapes and sizes, and their shape often matches that of the enthesis, or attachment site. For example, the tendons of the pectoralis major and latissimus dorsi are flattened sheets of connective tissue that attach to the upper part of the humerus, while the more rounded tendons at the wrist attach to bones in a more limited fashion. Tendons can also link one region of a muscle to another, or they can be present on the surface of a muscle as aponeuroses, allowing one muscle to glide over another. In some cases, there may be many small intramuscular tendons attaching a muscle to the bone, rather than a single discrete tendon.
Skeletal muscles are the most common type of muscle in the body, comprising 30% to 40% of total body mass. They are voluntary muscles, meaning that they move when you consciously decide to move that part of your body. They are composed of flexible muscle fibres that contract, allowing the muscles to move bones and perform a wide range of movements. Each muscle can contain thousands of fibres, which are woven together like a quilt.
The fibres of skeletal muscles appear striated, or striped, due to the arrangement of contractile units called sarcomeres. These sarcomeres give skeletal muscles their characteristic appearance and are arranged in regular, parallel bundles. Skeletal muscles are broadly classified into two fibre types: type I (slow-twitch) and type II (fast-twitch). Type I muscles are dense with capillaries and are rich in mitochondria and myoglobin, giving them their red colour.
Skeletal muscles play an important role in everyday activities such as breathing, eating, and moving bones. They also help regulate blood sugar (glucose) levels by taking up glucose from the blood as fuel or storing it for later use. It is important to keep skeletal muscles strong and healthy through physical activity, which can maintain or increase muscle strength.
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Frequently asked questions
A muscle strain, also known as a pulled muscle, is when your muscle is overstretched or torn. This is usually the result of fatigue, overuse, or improper use of a muscle.
The key symptoms of a muscle strain include sudden pain, swelling and bruising, loss of strength and range of motion. Most muscle strains happen for one of two reasons: either the muscle has been stretched beyond its limits or it has been forced to contract too strongly.
For mild to moderate strains, home treatment should be enough. This includes rest, ice, compression, and elevation (RICE). Severe strains or tears may require medical treatment, including surgery in some cases.
