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The human body has two types of striated muscles: skeletal muscles and cardiac muscles. Skeletal muscles are the most common muscles in the human body and are attached to the bones. They help the body with balance, posture, and
| Characteristics | Values |
|---|---|
| Types | Skeletal muscle, Cardiac muscle |
| Muscle Tissue | Features repeating functional units called sarcomeres |
| Appearance | Striped or striped appearance due to light and dark bands |
| Skeletal Muscle Function | Breathing, eating, movement, balance, posture, chewing, swallowing |
| Cardiac Muscle Function | Contraction of the heart walls, pumping of blood |
| Cardiac Muscle Cells | Unicellular, contain one nucleus, located centrally |
| Skeletal Muscle Cells | Multinucleated, contain satellite cells |
| Skeletal Muscle Mass | Varies from person to person, generally higher in males and taller/overweight people |
| Regeneration | Skeletal muscle regenerates better than cardiac muscle due to satellite cells |
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What You'll Learn
Skeletal muscle makes up 30-40% of body mass
Skeletal muscle, also known as striated muscle, is the most common type of muscle in the human body. Skeletal muscles make up between 30% and 40% of a person's total body mass. They are attached to the bones and allow us to perform a wide range of movements and functions. These include breathing, eating, and moving our bones, making them vital to our everyday activities.
Skeletal muscles are made up of flexible muscle fibres that range from less than half an inch to just over 3 inches in diameter. Each muscle can contain thousands of fibres. These fibres contract, allowing the muscles to move the bones so we can perform various movements. The fibres do not run parallel to each other but branch out in a complex pattern. Under a microscope, these fibres 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 muscles are voluntary muscles, meaning we control how and when they move and work. Nerves in our somatic nervous system send signals to make them function. For example, when reaching for a book on a shelf, we use skeletal muscles in our neck, arm, and shoulder.
In contrast, cardiac muscles are involuntary muscles controlled by the autonomic nervous system. They are found only in the heart and are responsible for heart contractions and pumping blood throughout the body. Cardiac muscle cells generally contain one nucleus, located in the central region, and are connected by intercalated discs.
It is important to maintain strong and healthy skeletal muscles as muscle mass decreases with age. Healthcare providers can advise on ways to build and maintain muscle strength, which can positively impact overall health.
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Cardiac muscle is striated and found in the heart
There are three types of muscle tissue in the human body: skeletal, smooth, and cardiac. Cardiac muscle, also known as myocardium or heart muscle, is a type of striated muscle that is found only in the heart.
Cardiac muscle is located between the outer layer of the heart wall (the pericardium) and the inner layer (the endocardium). It forms both the atria and the ventricles of the heart. The ventricles are thicker to allow for forceful contractions, while the atria are thinner. The cardiac muscle is responsible for the contractility of the heart, which is necessary for the pumping action. The pumping action of the heart is made possible by the contractions of the cardiac muscle, which pump blood throughout the body.
Cardiac muscle cells, also called cardiomyocytes, are the contractile myocytes of the cardiac muscle. They are striated, branched, and contain many mitochondria. Each myocyte contains a single, centrally located nucleus surrounded by a cell membrane known as the sarcolemma. The sarcolemma contains voltage-gated calcium channels, which are specialized ion channels that skeletal muscle does not possess.
Cardiac muscle cells are connected to each other by intercalated discs, which contain gap junctions and desmosomes. These interconnections allow the cardiomyocytes to contract together synchronously. The contractions in cardiac muscle are due to a myogenic response of the heart's pacemaker cells. These cells respond to signals from the autonomic nervous system to either increase or decrease the heart rate.
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Striated muscles have a striped appearance
Skeletal muscle and cardiac muscle are the two types of striated muscle. Striated muscle tissue features repeating functional units called sarcomeres, which are visible under a microscope and give the tissue its striated appearance.
Skeletal muscles are attached to some component of the skeleton and are under voluntary control. They are the most common type of muscle in the human body, accounting for 30% to 50% of total body mass. They are responsible for breathing, movement, and posture maintenance.
Cardiac muscles, on the other hand, are located in the walls of the heart and are under involuntary control. Their contractions pump blood throughout the body due to a myogenic response of the heart's pacemaker cells.
The striated appearance of these muscles is due to the presence of sarcomeres, which are composed of two types of protein: actin and myosin. These proteins form filaments that slide past each other during muscle contraction, creating a striped pattern. The various light and dark bands in the myofibril are identified by letters, with the thin, dark 'Z' line being the origin of the slender actin filaments and the thicker myosin filaments forming the 'A' band.
The sliding of the actin and myosin filaments past each other creates cross-bridges, resulting in muscle contraction. This contraction is essential for the functioning of both skeletal and cardiac muscles, allowing for movement, breathing, and the pumping of blood throughout the body.
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Skeletal muscle is voluntary and controlled by the brain
Skeletal muscle, one of the two types of striated muscle, is voluntary and controlled by the brain. It is attached to the skeleton and makes up between 30% and 40% of the human body's total mass. Skeletal muscles are made up of flexible muscle fibres that contract, allowing for movement. Each muscle can contain thousands of fibres. These fibres are red and white and are called striated muscles because they have a striped appearance under a microscope.
Skeletal muscles are connected to the bones by tendons, which are tough connective tissues. They are attached to some component of the skeleton, and their contractions enable breathing, movement, and posture maintenance. They also control the movement of food in the alimentary canal and play a role in the initial stages of digestion, such as chewing and swallowing.
The two types of striated muscle, skeletal and cardiac, have some structural similarities. Both types of muscle contain T-tubules, which enable the release of calcium ions from the sarcoplasmic reticulum. However, skeletal muscles are better able to regenerate than cardiac muscles due to the presence of satellite cells.
The voluntary nature of skeletal muscles means that their movement can be physically controlled, and they are directed by the nervous system. Nerves in the somatic nervous system send signals to make them function. For example, when reaching for a book on a shelf, the skeletal muscles in the neck, arm, and shoulder are activated.
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Striated muscles are required for whole-body oxygen supply
Striated muscles are a vital part of the human body's musculoskeletal system. They are responsible for various functions, including chewing, swallowing, breathing, and maintaining posture. The two types of striated muscles are skeletal muscle and cardiac muscle, both of which play a crucial role in ensuring the whole-body oxygen supply.
Skeletal muscles, also known as striated muscles, are the most common type of muscle in the human body, accounting for 30% to 40% of total body mass. They are attached to the bones through tendons, which are tough connective tissues. These muscles are under our voluntary control and are responsible for various movements. For example, when reaching for a book on a shelf, we use the skeletal muscles in our neck, arm, and shoulder. Skeletal muscles are also essential for breathing, as their contractions enable inhalation and exhalation by expanding and contracting the chest cavity.
Cardiac muscle, the other type of striated muscle, is found in the heart. It is responsible for the heart's contractions, which are essential for pumping blood throughout the body. These contractions are due to the myogenic response of the heart's pacemaker cells, which respond to signals from the autonomic nervous system to adjust the heart rate. The cardiac muscle cells contain many mitochondria and myoglobin, and they are connected by intercalated discs.
The striated muscles, both skeletal and cardiac, play a crucial role in ensuring the whole-body oxygen supply. During exercise, the transition from rest to physical activity requires remarkable adjustments in the cardiovascular system. This includes an increase in heart rate and cardiac contractility, leading to increased cardiac output. Additionally, the rate and depth of respiration increase, requiring enhanced blood flow to the respiratory muscles. The skeletal muscles also experience increased blood flow during exercise, ensuring optimal oxygen utilization.
The importance of striated muscles in whole-body oxygen supply is further emphasized by the adaptations that occur with long-term exercise training. These adaptations enhance blood flow capacity and improve oxygen diffusing capacity in the skeletal muscles. Additionally, the increase in oxygen extraction from the blood during exercise results in a higher arterio-venous oxygen content difference, ensuring that a larger proportion of the delivered oxygen is utilized by the active muscles.
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Frequently asked questions
Striated muscles are muscles in the body that have a striped appearance due to their light and dark bands. They are also known as skeletal muscles and are under voluntary control.
The two types of striated muscles are skeletal muscle and cardiac muscle. Skeletal muscles are attached to the bones and are part of the musculoskeletal system. Cardiac muscles are found exclusively in the muscular walls of the heart.
The main function of striated muscles is to create force and contract. Contractions in skeletal muscle enable breathing, movement, and posture maintenance. Contractions in cardiac muscle pump blood throughout the body.
Smooth muscles are not striated as they do not contain sarcomeres. Smooth muscles are found in the walls of hollow visceral organs such as the liver, pancreas, and intestines. On the other hand, striated muscles have a striped appearance due to the presence of sarcomeres, which are the basic contractile units.
