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Muscle tissue is broadly classified into three types: skeletal, smooth, and cardiac. Striated muscle tissue is a type of muscle tissue that features repeating functional units called sarcomeres, which give the tissue a striated appearance under a microscope. The two types of striated muscle are skeletal muscle and cardiac muscle. Skeletal muscle is the most common type of muscle tissue found in the body and is responsible for voluntary movements of bones. Cardiac muscle, on the other hand, is found only in the heart and is responsible for heart contractions. Smooth muscle, unlike skeletal and cardiac muscle, is not striated due to the absence of sarcomeres. So, is visceral muscle striated? Well, visceral muscle refers to the muscles of the gastrointestinal system, including the walls of hollow visceral organs such as the intestines, pancreas, liver, and gallbladder. Since smooth muscle is found in the walls of hollow structures like the intestines, it can be concluded that visceral muscle is not striated.
| Characteristics | Values |
|---|---|
| Muscle Tissue Classification | Striated or non-striated/smooth |
| Striated Muscle Subdivisions | Skeletal Muscle, Cardiac Muscle |
| Skeletal Muscle Cell Characteristics | Elongated, multinucleate, non-branching, arranged in parallel |
| Skeletal Muscle Cell Size | Several centimeters or tens of centimeters in length |
| Skeletal Muscle Biological Classification | Syncytia |
| Skeletal Muscle Composition | Skeletal muscle fibers, blood vessels, nerve fibers, connective tissue |
| Skeletal Muscle Wrapping | Epimysium |
| Skeletal Muscle Fiber Arrangement | Wrapped in endomysium, forming fascicles |
| Skeletal Muscle Fiber Thickness | 20-100 µm |
| Skeletal Muscle Fiber Length | Up to 20 cm |
| Cardiac Muscle Location | Walls of the heart |
| Cardiac Muscle Cell Composition | Intercalated discs |
| Smooth Muscle Location | Walls of intestines, blood vessels, hollow visceral organs (e.g., intestines, pancreas, liver, gallbladder) |
| Smooth Muscle Cell Characteristics | Spindle-like with tapered ends |
| Striated Muscle Composition | Actin, myosin, sarcomeres |
| Sarcomere Composition | Actin filaments, myosin filaments, bright (I-) bands, dark (A-) bands, M-line |
| Sarcomere Function | Muscular contraction |
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What You'll Learn
Skeletal muscle is a type of striated muscle tissue
Muscle tissue is classified as either striated or non-striated/smooth based on the presence or absence of stripes or furrows seen at a microscopic level. Striated muscle, also known as skeletal muscle, is the most common type of muscle in the body. It is one of the three types of vertebrate muscle tissue, the others being cardiac muscle and smooth muscle. Skeletal muscle is located between the bones of the skeletal system throughout the body and is attached by tendons to the bones of a skeleton.
Skeletal muscle is composed of highly elongated, multinucleate, non-branching cells, known as muscle fibres, which are arranged in a parallel manner. These cells are formed by the fusion of several smaller, mononuclear cells, known as myoblasts. Skeletal muscle cells are much longer than other types of muscle tissue cells and are often several centimetres or tens of centimetres in length. Each muscle can contain thousands of fibres, and the number of nuclei contained within a cell is proportional to its length. The nuclei are referred to as myonuclei and are located along the inside of the cell membrane.
The cytoplasm of each skeletal muscle fibre is largely occupied by subunits known as myofibrils, which extend the length of the cell. When bundled together, myofibrils form a unique striated pattern, creating sarcomeres, which are the fundamental contractile unit of skeletal muscle. The two most significant myofilaments are actin and myosin filaments, which are arranged to form various bands on the skeletal muscle. The arrangement of these filaments within each sarcomere contributes to the formation of distinct striations of dark A bands and light I bands when viewed under a light microscope. Myosin is visible as the A band of the sarcomere, while actin filaments are anchored to a structure known as the Z disc, located at either end of the sarcomere.
Skeletal muscle is often referred to as 'voluntary' muscle, as its contraction is believed to be under conscious control. However, this is a misconception, as skeletal muscle is involved in various movements that occur at a subconscious level, such as chewing and swallowing. Skeletal muscle serves many vital functions, including providing structural support, maintaining posture, and acting as a storage source for amino acids and energy during starvation.
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Striated muscles are made up of individual muscle fibres
Muscle tissue is categorised into three types: skeletal, smooth, and cardiac. Skeletal muscles, also known as striated muscles, are the most common type of muscle in the human body. They are attached to the skeleton and are responsible for various functions, including breathing, eating, and movement.
The cytoplasm of each skeletal muscle fibre is occupied by structures called myofibrils, which are composed of repeating contractile units called sarcomeres. Sarcomeres are formed by the arrangement of actin and myosin filaments, creating distinct striations or stripes when viewed under a microscope. These actin and myosin filaments are responsible for muscle contraction, driven by the release of calcium ions from the sarcoplasmic reticulum.
The number of muscle fibres in a striated muscle cannot be increased through exercise. Instead, muscles grow larger through muscle cell growth and the addition of new protein filaments, along with mass provided by undifferentiated satellite cells. Factors such as hormone signalling, developmental factors, strength training, and disease can induce muscle growth.
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Striated muscles are responsible for voluntary movements of bones
Striated muscles, also known as skeletal muscles, are responsible for the voluntary movements of bones. They are attached to bones via tendons and are found throughout the body, making up between 30% and 40% of total body mass. Skeletal muscles are composed of highly elongated, multinucleate, non-branching cells arranged in a parallel manner. These cells, known as myocytes, contain a high abundance of actin and myosin filaments, which contribute to the formation of distinct striations or stripes when viewed under a microscope.
The actin and myosin filaments within skeletal muscle cells are arranged in a regular pattern, creating functional units called sarcomeres. Sarcomeres consist of dark A bands and light I bands, with the M line at the centre and the Z disc or Z line at the terminal boundary. This arrangement of filaments allows for the contraction and expansion of skeletal muscles, enabling a wide range of movements.
Skeletal muscles serve various functions in the body, including producing movement, sustaining body posture and position, maintaining body temperature, storing nutrients, and stabilizing joints. They are involved in both conscious and subconscious movements, such as chewing and swallowing during digestion, and expanding and contracting the chest cavity for inhalation and exhalation.
The fibres of skeletal muscles contract and tighten, allowing for the movement of bones. Each muscle can contain thousands of fibres, which are surrounded by different types of sheaths or coverings, including the epimysium and perimysium. Skeletal muscles also play a role in converting chemical energy into mechanical energy, generating force and power for physical activities.
In summary, striated muscles, or skeletal muscles, facilitate the voluntary movements of bones through their unique structure and function. Their ability to contract and expand in response to stimuli allows for the wide range of movements that we perform on a daily basis.
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Cardiac muscle is a type of striated muscle tissue
Muscle tissue is categorised as either striated or non-striated/smooth. Striations, or stripes, are formed by the arrangement of actin and myosin filaments within the myocyte. There are three types of muscle tissue: skeletal, smooth, and cardiac. Cardiac muscle, also known as myocardium, is one of the three major muscle categories found in the human body. It is a type of striated muscle tissue.
Cardiac muscle cells are located in the heart's walls and appear striated or striped. They are under involuntary control, meaning they work without conscious thought. The heart is made up of three layers: the pericardium, myocardium, and 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 is a fibrous sac that surrounds the heart and consists of the epicardium, pericardial space, parietal pericardium, and fibrous pericardium.
Cardiac muscle cells, or cardiomyocytes, are striated, branched, and contain many mitochondria. Each cardiomyocyte contains a single, centrally located nucleus surrounded by a cell membrane called the sarcolemma. The sarcolemma of cardiac muscle cells contains voltage-gated calcium channels, which are specialised ion channels that skeletal muscle cells do not possess. The t-tubules in the sarcolemma are highly branched invaginations that play a role in excitation-contraction coupling, action potential initiation and regulation, maintaining resting membrane potential, and signal transduction.
Cardiac muscle cells contain branched fibres connected via intercalated discs that contain gap junctions and desmosomes. These interconnections allow the cardiomyocytes to contract together synchronously, enabling the heart to work as a pump. The functional unit of cardiomyocyte contraction is the sarcomere, which consists of thick myosin and thin actin filaments. The interaction between these filaments forms the basis of the sliding filament theory.
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Smooth muscle tissue is not striated
Muscle tissue is classified as either striated or non-striated/smooth based on the presence or absence of stripes or furrows. These stripes are formed due to the arrangement of actin and myosin filaments within the myocyte. The two types of striated muscle are skeletal muscle and cardiac muscle. Skeletal muscle is the most common type of muscle in the body and is often referred to as 'voluntary' muscle as its contraction is under conscious control. However, this is a misconception as skeletal muscle is also involved in various movements that occur at a subconscious level.
Smooth muscle tissue, unlike skeletal and cardiac muscle tissue, is not striated as it lacks sarcomeres. Smooth muscle is found in hollow structures such as the walls of intestines or blood vessels. It gets its name from its smooth appearance, which is distinct from most other types of muscle. Smooth muscle cells have a different structure from skeletal muscle cells, which are long and cylindrical, giving them a grooved surface. Smooth muscle movements occur involuntarily and are responsible for various automated functions in the body, including blood pressure, circulation, vision, and digestion.
While skeletal muscle cells have many nuclei, smooth muscle cells have a single nucleus. The fibres of striated muscle are cylindrical with blunt ends, while those in smooth muscle are spindle-shaped with tapered ends. Striated muscle tissue also contains more mitochondria than smooth muscle tissue. The main function of striated muscle tissue is to create force and contract, enabling breathing, movement, and posture maintenance. Smooth muscle, on the other hand, is involved in essential automatic processes that occur without conscious thought.
Smooth muscle is one of the three main types of muscle, along with skeletal and cardiac muscle. It is a key component of various body systems, including the airway muscles and the zonule fibres that focus the eyes. Smooth muscle plays a crucial role in maintaining optimal body functions, and any conditions affecting it can be severe. While smooth muscle tissue is not striated, it is an essential component of the body's intricate systems, working quietly behind the scenes to support vital functions.
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Frequently asked questions
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. The two types of striated muscle are skeletal muscle and cardiac muscle.
Striated muscle tissue is made up of skeletal and cardiac muscle. Non-striated muscle tissue, or smooth muscle tissue, is found in the walls of hollow structures such as the intestines or blood vessels. Smooth muscle tissue does not contain sarcomeres.
The main function of striated muscle tissue is to create force and contract. In cardiac muscle, these contractions pump blood throughout the body. In skeletal muscle, the contractions enable breathing, movement, and posture maintenance.
