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Striped muscle, also known as striated muscle, is a type of contractile tissue that is marked by transverse striations. It is responsible for moving skeletal parts to which it is usually attached. Striated muscle tissue has repeating functional units called sarcomeres, which are visible along muscle fibres, giving a striated appearance to the tissue. The two types of striated muscle are skeletal muscle and cardiac muscle. Skeletal muscle is the most common type of muscle in the body, comprising 30% to 40% of total body mass. It is a voluntary muscle, meaning we control how and when it works. Cardiac muscle, on the other hand, is found in the walls of the heart and is under involuntary control.
| Characteristics | Values |
|---|---|
| Definition | Striped muscle, or striated muscle, is a type of contractile tissue that is marked by transverse striations. |
| Appearance | Striated muscle has a striped appearance due to light and dark bands that appear in an alternate fashion. |
| Types | There are three types of striated muscle: skeletal, cardiac, and smooth. |
| Function | Striated muscle is responsible for creating force and contracting. |
| Control | Skeletal muscle is voluntary, meaning you control how and when it works. Cardiac and smooth muscle are involuntary. |
| Structure | Striated muscle is composed of long strands of proteins called actin and myosin that twist around each other in a helical shape. |
| Regeneration | Skeletal muscle can regenerate better than cardiac muscle due to the presence of satellite cells. |
| Percentage of Body Mass | Skeletal muscle comprises 30% to 40% of total body mass. |
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What You'll Learn
Skeletal muscle is a type of striated muscle
Skeletal muscles are made up of multiple tissues, including blood vessels, nerve fibres, and connective tissue sheaths. The outermost sheath of connective tissue covering each muscle is called the epimysium. Each muscle is made up of groups of muscle fibres called fascicles, surrounded by a connective tissue layer called the perimysium. The perimysium organises the muscle fibres, which are encased in collagen and endomysium, into fascicles. Each muscle fibre contains sarcolemma, sarcoplasm, and sarcoplasmic reticulum.
The contractile elements of skeletal muscle fibres are made up of actin and myosin myofilaments, which are arranged in a striated pattern to form the dark A band, the light I band, and the fundamental unit of contraction, or sarcomere. The sarcomere consists of a central M line, with thick myosin myofilaments attached to either side. The sarcomere is the functional unit of a muscle fibre, and each muscle cell contains myofibrils composed of actin and myosin myofilaments repeated as a sarcomere.
Signals from motor neurons cause skeletal muscle fibres to depolarise and release calcium ions from the sarcoplasmic reticulum. The calcium drives the movement of myosin and actin filaments, causing the sarcomere to shorten and the muscle to contract. Skeletal muscles connect to bones via tendons, and their contractions enable breathing, movement, and posture maintenance.
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Striated muscles can contract and relax independently
Striated muscles are muscles that can contract and relax independently. They are composed of long strands of proteins called actin and myosin that twist around each other in a helical shape. When these two proteins work together, they create a contraction force that pulls on the fibres within the muscle cell. This causes the muscle to contract. The actin filaments are attached to the Z-line, which is found in the middle of the I-bands. The area between two Z-lines forms a functional unit called the sarcomere.
The two types of striated muscle are skeletal muscle and cardiac muscle. Skeletal muscles are attached to the skeleton and are under voluntary control. They are responsible for a wide range of movements and functions, such as breathing, movement, and posture maintenance. Skeletal muscles can regenerate better than cardiac muscles due to satellite cells, which are dormant in healthy skeletal muscle tissue.
Cardiac muscles, on the other hand, are found exclusively in the muscular walls of the heart. They are under involuntary control and help in the contraction of the heart walls and the pumping of blood throughout the body. Cardiac muscle cells have a complex branching pattern and are smaller than skeletal muscle cells.
Striated muscles get their name from their striped appearance, which is caused by alternating light and dark bands. These bands are composed of densely packed myofibrils, which are the functional units of muscle fibres. The bright bands are called isotropic (I-) bands, while the dark bands are called anisotropic (A-) bands. In the centre of the A-bands is the M-line, where the myosin filaments are anchored.
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Striated muscles are composed of myofibrils
Striated muscles, also known as skeletal muscles, are muscles in the body that have a striped appearance. This striated pattern is caused by the presence of alternating light and dark bands. These muscles are attached to the bones and are part of the musculoskeletal system, helping the body with balance, posture, and
Sarcomeres are the basic functional units of muscle fibres and are responsible for the striated appearance of the tissue. Under a microscope, sarcomeres can be visualised along the muscle fibres, appearing as alternating light and dark bands. The actin filaments are attached to the Z-line, found in the middle of the I-bands, and the area between two Z-lines forms a sarcomere.
The contraction of striated muscles occurs when the myosin filaments bind to the actin filaments through cross-bridges, and the ATP-dependent rowing motion of the myosin heads causes a shift in the actin filaments. This motion results in the shortening of the sarcomere, leading to muscle contraction. In skeletal muscles, this contraction transfers force to the surrounding structures, allowing for movement and function.
The regeneration process of skeletal muscle involves three phases: the inflammatory response, the activation and differentiation of satellite cells, and the maturation and remodelling of newly formed myofibrils. This process is facilitated by macrophages, which induce phagocytosis of cell debris and secrete anti-inflammatory cytokines to resolve inflammation.
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Striated muscles are made up of skeletal and cardiac muscles
Striated muscle tissue is a muscle tissue that features repeating functional units called sarcomeres. Under a microscope, sarcomeres are visible along muscle fibres, giving a striated appearance to the tissue. Striated muscles are made up of skeletal and cardiac muscles.
Skeletal muscles are attached to the skeleton and are under voluntary control. They comprise 30% to 40% of the human body's total mass. Skeletal muscles are the most common type of muscle in the body and are used for breathing, eating, and moving bones. They are also called striated muscles because they look striated or striped under a microscope. Skeletal muscle fibres are red and white and are made up of skeletal muscle fibres, blood vessels, nerve fibres, and connective tissue. Skeletal muscle cells have many nuclei, unlike cardiac and smooth muscle cells, which have only one nucleus.
Cardiac muscles, on the other hand, are located in the walls of the heart and are under involuntary control. Contractions in cardiac muscle tissue are due to a myogenic response of the heart's pacemaker cells. These contractions pump blood throughout the body. Cardiac muscles are also striated, meaning they have a striped appearance under a microscope. Both skeletal and cardiac muscles are types of striated muscles.
Skeletal muscle is able to regenerate far better than cardiac muscle due to satellite cells, which are dormant in all healthy skeletal muscle tissue. There are three phases to the regeneration process: the inflammatory response, the activation, differentiation, and fusion of satellite cells, and the maturation and remodelling of newly formed myofibrils. This regeneration process is not possible in adult humans for cardiac muscle tissue, which can lead to scarring and heart failure.
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Striated muscles are responsible for the voluntary movements of bones
Striated muscle tissue is a type of muscle tissue that features repeating functional units called sarcomeres. Under a microscope, the sarcomeres are visible along the muscle fibres, giving the tissue a striated appearance. The two types of striated muscle are skeletal muscle and cardiac muscle. Skeletal muscle is the most common type of muscle in the body, comprising 30% to 40% of total body mass. These muscles are attached to the bones and are responsible for a wide range of movements and functions.
Skeletal muscles are voluntary muscles, meaning that an individual has control over how and when they work. They are part of the musculoskeletal system and help the body with balance, posture, and movement. Skeletal muscles are connected to the bones by collagen-rich tendons. When an individual wants to move a part of their body, the nerves in their somatic nervous system send signals to the skeletal muscles, causing them to contract or relax.
The skeletal muscles then transfer the contraction or relaxation to the tendons and the periosteum (a coating on the bone), ultimately causing the bone to move. This process is essential for various movements, such as reaching for a book on a shelf, which involves the contraction of skeletal muscles in the neck, arm, and shoulder.
The ability of striated muscles to contract and relax independently is due to their unique structure. The muscle fibres are composed of long strands of proteins called actin and myosin, which twist around each other in a helical shape. When these proteins run together, they create a contraction force that pulls on the fibres within the muscle cell. This contraction force is essential for the overall movement of the bones to which the skeletal muscles are attached.
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Frequently asked questions
Striped muscle, also known as striated muscle, is a type of contractile tissue that is marked by transverse striations. The two types of striated muscle are skeletal muscle and cardiac muscle. Skeletal muscle is the most common type of muscle in the body.
Under a microscope, the individual muscle fibres of the striped muscle can be seen running along its length. The light and dark bands that appear in an alternate fashion give the muscle its striped appearance.
Striped muscle is responsible for creating force and contracting. In skeletal muscle, contractions enable movement, breathing, and posture maintenance. In cardiac muscle, contractions pump blood throughout the body.
