Logan Steele
Voluntary muscles, also known as skeletal muscles, are those under conscious control. They are attached to bones and allow you to perform a wide range of movements and functions. These muscles make up 30-40% of your total body mass and are located throughout your body. Examples of voluntary muscles include those in your neck, arms, legs, back, and trunk. These muscles are responsible for movements such as flicking your thumb or sprinting around a track.
| Characteristics | Values |
|---|---|
| Definition | Voluntary muscles are those under conscious control, like neck and leg muscles that a person chooses to move. |
| Types | Skeletal muscles are voluntary muscles. |
| Location | Voluntary muscles are found in the arms, legs, neck, back, and trunk. |
| Control | Voluntary muscles are controlled by the somatic nervous system. |
| Function | Voluntary muscles allow for a wide range of movements and functions. |
| Composition | Skeletal muscles are composed of muscle fibers that contract to allow for movement. |
| Mass | Skeletal muscles comprise 30% to 40% of total body mass. |
| Health | Weakness or inability to control voluntary muscles can signal health issues such as neuromuscular disorders or electrolyte imbalances. |
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What You'll Learn
Voluntary muscles are under conscious control
Voluntary muscles are controlled by the somatic nervous system, which sends signals to make them function. For example, when reaching for a book on a shelf, skeletal muscles in the neck, arm, and shoulder are used. The skeletal muscles are also responsible for movements like chewing and swallowing, as well as expanding and contracting the chest cavity for breathing.
Voluntary muscles are composed 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, and these fibres contract (tighten) to allow the muscles to move bones and perform different movements. Some muscle fibres contract quickly and use short bursts of energy, like the hamstring muscles, while others move slowly, like the back muscles that help with posture.
Voluntary movements are actions that are consciously controlled. These movements can be as simple as flicking a thumb to scroll through a phone or as complex as sprinting around a track. The efferent leg of the peripheral nervous system conveys commands to the muscles and is responsible for voluntary movement. The majority of muscle activity is volitional, resulting from complex interactions between various areas of the brain.
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Skeletal muscles are voluntary muscles
Skeletal muscles make up around 30% to 40% of your total body mass, and they are the most common type of muscle in your body. They are composed of flexible muscle fibers that range in diameter from less than half an inch to just over 3 inches. Each muscle can contain thousands of fibers, and these fibers contract, allowing the muscles to move the bones so you can perform different movements.
The tissue of skeletal muscle is striated, meaning it has a striped appearance due to the arrangement of sarcomeres. Skeletal muscle cells are much longer than other types of muscle tissue and are also known as muscle fibers. These muscle fibers are formed from the fusion of developmental myoblasts in a process called myogenesis, resulting in long multinucleated cells.
Skeletal muscles are part of the voluntary muscular system, and they are typically attached to bones by tendons. Skeletal muscles are controlled by the somatic nervous system, which sends signals to make them function. Weakness or an inability to control voluntary skeletal muscles can signal a health issue, such as a neuromuscular disorder or electrolyte imbalance.
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Cardiac muscle is involuntary
Voluntary muscles are those under conscious control, such as the skeletal muscles in the neck and legs. They make up 30% to 40% of the human body and are attached to bones, allowing for a wide range of movements.
In contrast, cardiac muscle is involuntary. It is one of the three types of muscle tissues in the body, with the other two being skeletal and smooth muscle. Cardiac muscle is composed of cardiac muscle cells, also known as cardiomyocytes, which are the contractile myocytes of the heart. These cells work together to pump blood from the heart.
Cardiac muscle is found only in the heart and constitutes the main tissue of the heart wall. It forms a thick middle layer, or myocardium, between the outer layer of the heart wall (the pericardium or epicardium) and the inner layer (the endocardium). The myocardium is composed of individual cardiac muscle cells joined by intercalated discs and encased by collagen fibres and other substances that form the extracellular matrix.
The cardiac muscle contracts and releases involuntarily, keeping the heart pumping blood around the body. This process is controlled by both the autonomic nervous system and its own specialized cardiomyocytes known as pacemaker cells, which set the rhythm of the heart contractions. The pacemaker cells generate electrical impulses that tell the cardiac muscle cells to contract and relax, controlling the heart rate and determining how fast the heart pumps blood.
Cardiac muscle is striated, like skeletal muscle, but its contractions are automatic and rhythmic due to the influence of the pacemaker cells. These pacemaker cells are connected to other cardiac muscle cells, allowing them to pass along signals and create a wave of contractions that result in a heartbeat.
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Smooth muscle is involuntary
Voluntary muscles are those under conscious control, like neck and leg muscles. They are also known as skeletal muscles, which are the most common type of muscle in the body, comprising 30% to 40% of total body mass.
In contrast, smooth muscle is involuntary. It is one of the three major types of vertebrate muscle tissue, the others being skeletal and cardiac muscle. Smooth muscle is found throughout the body and serves a variety of functions. It is present in the walls of hollow organs, including the stomach, intestines, bladder, and uterus. It is also found in the urinary system, where it helps to rid the body of toxins and maintain electrolyte balance.
Smooth muscle is also present in the cardiovascular system, where it plays a vital role in regulating blood pressure and tissue oxygenation. It is derived from both mesoderm and neural crest cells, and its development is influenced by neural crest cells, which play a role in determining the location and presentation of vascular diseases.
Smooth muscle has a unique cellular structure, with thick and thin filaments that do not form striations or bands. It contains large amounts of actin and myosin, the proteins responsible for muscle contraction. This structure gives smooth muscle greater elastic properties than skeletal muscle, allowing it to maintain tone for extended periods.
Smooth muscle is controlled by the autonomic nervous system and can contract without input from a motor neuron, particularly in the case of single-unit smooth muscle. This type of smooth muscle makes up the majority and can be found in the walls of most internal organs, lining blood vessels, the urinary tract, and the digestive tract. Multi-unit smooth muscle, on the other hand, is found in the trachea, the iris of the eye, and lining large elastic arteries.
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Voluntary muscles are controlled by the somatic nervous system
Voluntary muscles are those under conscious control, such as the neck and leg muscles. They are also known as skeletal muscles, which are attached to bones and allow you to perform a wide range of movements. Skeletal muscles make up a significant portion of total body mass, ranging from 30% to 40%. These muscles are composed of flexible muscle fibres that contract and tighten, enabling the movement of bones.
The somatic nervous system, specifically the nerves within it, plays a crucial role in facilitating voluntary movements. When an individual decides to perform an action, the somatic nervous system sends signals to the voluntary muscles, instructing them to contract or relax accordingly. This results in coordinated movements that allow for various physical activities and sports.
Neuromuscular junctions, which are spaces between nerve cells and muscle fibres, are essential for the communication between the somatic nervous system and voluntary muscles. Neurotransmitters are released at these junctions, facilitating the transmission of signals from nerves to muscles. However, neuromuscular disorders or damage to these junctions can disrupt this communication, leading to significant muscle weakness, atrophy, or pain.
Maintaining the health of voluntary muscles is crucial, as they are essential for daily physical activities and sports. This involves keeping them strong and healthy through exercise and ensuring proper nutrition to support muscle function. Additionally, understanding the role of the somatic nervous system in controlling these muscles highlights the importance of overall nervous system health for optimal voluntary muscle performance.
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Frequently asked questions
Voluntary muscles are found in the neck, arms, shoulders, legs, back, trunk, and head. They are also found in the tongue, pharynx, eyes, and ears.
Voluntary muscles are those under conscious control, meaning you decide when and how they move.
Flicking your thumb, sprinting, and any other movements needed in sports or physical activity are all examples of voluntary movements.
Involuntary muscles are those not under conscious control, such as the heart muscle and muscles in the urinary system.
Your heart beating, breathing, and muscles in and around your organs moving to keep your body working are all involuntary movements.
