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The human body is an intricate system, housing over 600 muscles that support various functions, from pumping blood to giving birth. These muscles are soft tissues that enable movement, breathing, swallowing, and sustaining life. Skeletal muscles, the most common type, are attached to bones and respond to conscious control. Smooth muscles, found in organ walls, involuntarily contract to move substances through the body. Cardiac muscles, unique to the heart, pump blood and are also involuntary. Together, these three types of muscles work with the brain and nerves in the neuromuscular system to facilitate movement and support vital bodily functions.
| Characteristics | Values |
|---|---|
| Number of muscles in the human body | More than 600 |
| Muscle tissue types | 3 (Visceral/Smooth, Cardiac, and Skeletal) |
| Skeletal muscle composition | 30-40% of total body mass |
| Skeletal muscle fibres | Elongated, multinucleated cells ranging from 10 to 100 micrometers in diameter and several centimetres long |
| Muscle function | Movement, support, and control of organs |
| Muscle movement | Ipsilateral (towards contracting muscle) or contralateral (away from contracting muscle) |
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What You'll Learn
- Skeletal muscle, the most common type, is found throughout the body
- Cardiac muscle is responsible for pumping blood and is only found in the heart
- Smooth muscle is controlled by the unconscious part of the brain
- Visceral muscle is found inside organs like the stomach and intestines
- Muscle fibres work together to move your body and its organs
Skeletal muscle, the most common type, is found throughout the body
Skeletal muscle mass varies from person to person. Males generally have more skeletal muscle mass than females, and taller or overweight people also tend to have higher muscle mass. Muscle mass decreases with age. Skeletal muscles serve a variety of functions, including chewing and swallowing, as well as expanding and contracting the chest cavity for inhalation and exhalation.
Skeletal muscles are a vital part of the musculoskeletal system. They are involved in the secretion of myokines, a wide range of cytokines and other peptides that act as signalling molecules. Interleukin 6 (IL-6) is the most studied myokine, and other muscle contraction-induced myokines include BDNF, FGF21, and SPARC. Skeletal muscles also play a role in producing body heat, generating up to 85% of the body's heat as a by-product of muscular activity.
Skeletal muscles are susceptible to strains, which occur when the muscle fibres are stretched beyond their limit and tear. Maintaining muscle strength is important for overall health, and healthcare providers can guide individuals in building and maintaining muscle strength.
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Cardiac muscle is responsible for pumping blood and is only found in the heart
The human body is made up of more than 600 muscles that help us perform a variety of tasks, from holding our bodies still to running marathons. These muscles are made up of thousands of small fibres woven together, allowing us to move our organs and bodies.
One of the most important muscles in the human body is the heart, which is made of a special type of muscle tissue called cardiac muscle. This type of muscle tissue is only found in the heart and is responsible for pumping blood throughout the body. The heart beats thousands of times a day, keeping us alive.
Cardiac muscle cells, also called cardiomyocytes, are the contracting cells that allow the heart to pump blood. These cells are surrounded by an extracellular matrix produced by supporting fibroblast cells. They contract with enough force to pump blood into circulation and supply the metabolic demands of the entire body. This process is known as cardiac output and is influenced by the heart rate and stroke volume.
Cardiac muscle cells must also be able to generate and transfer electrical impulses from cell to cell. These electrical impulses, along with hormones and signals from the brain, adjust the rate of contraction. While the cardiac muscle is influenced by these external factors, it also stimulates itself to contract, demonstrating its involuntary nature. This means that the heart beats on its own without any conscious input from the individual.
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Smooth muscle is controlled by the unconscious part of the brain
The human body is made up of more than 600 muscles, which can be categorised into three types: skeletal, cardiac, and smooth muscle. Skeletal muscles are the most common type of muscle in the body and are the only voluntary muscles, meaning an individual can control how and when they move and work. They make up between 30% and 40% of a person's total body mass.
Smooth muscle, on the other hand, is an involuntary muscle that is controlled by the unconscious part of the brain. It is often used to describe visceral muscle because, when viewed under a microscope, it has a very smooth and uniform appearance. This is in contrast to the banded appearance of skeletal and cardiac muscles. Smooth muscle is found inside organs like the stomach, intestines, and blood vessels and is responsible for making organs contract to move substances through the organ.
The nervous system can use smooth muscle to tightly regulate many of the body's subsystems without any conscious thought. For example, a person does not need to actively think about their blood pressure for it to adapt to increasing oxygen demands from exercise. The nervous system instead uses hormones, neurotransmitters, and other receptors to control smooth muscle spontaneously. Smooth muscle also plays an important role in the disease process throughout the body. For instance, the use of bronchodilators to relax airway smooth muscle is a common and life-saving asthma treatment.
Cardiac muscle, which is found only in the heart, is also an involuntary muscle. While hormones and signals from the brain adjust the rate of contraction, cardiac muscle stimulates itself to contract and pump blood throughout the body. Cardiac muscle is considered intrinsically controlled.
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Visceral muscle is found inside organs like the stomach and intestines
Visceral muscle, also known as smooth muscle, is the most common type of muscle in the human body. It is found in the walls of hollow visceral organs such as the stomach and intestines, as well as the liver, pancreas, and blood vessels. Unlike skeletal or heart muscle, visceral muscle does not have a band-like appearance. Instead, it is composed of bundles of specialized cells that contract and relax to create movement, allowing food and other substances to pass through the body. These muscles are controlled by the unconscious part of the brain, making them involuntary muscles that cannot be controlled by the conscious mind.
Visceral muscle tissue is associated with the internal organs of the body, especially those in the abdominal cavity. It lines the blood vessels, stomach, digestive tract, and other internal organs. The muscle fibres are spindle-shaped and are anchored in dense bodies dispersed throughout the cytoplasm and attached to the muscle membrane.
The structure of visceral muscle differs from that of skeletal or cardiac muscle. Visceral muscle fibres do not have stripes and are not arranged in ordered sarcomeres. Instead, they contain actin and contractile myosin proteins, which interact to generate tension. This unique structure allows visceral muscles to produce slow and steady contractions, which are essential for the gradual movement of food and substances through the digestive tract.
As the weakest of all muscle tissues, visceral muscles have relatively low energy production to minimize energy requirements, as they need to work uninterrupted for extended periods. This muscle tissue is composed of nerves, blood vessels, connective tissue, and smaller strands called myofibrils, which contain interlaced filaments of muscle proteins.
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Muscle fibres work together to move your body and its organs
The human body has more than 600 muscles, which are used almost constantly and are essential to keep us alive. These muscles are made up of thousands of muscle fibres, which are single muscle cells. When grouped together, these muscle fibres work to generate movement in the body and its internal organs.
There are three types of muscle tissue in the body: skeletal, smooth, and cardiac. Skeletal muscles are attached to the bones and help with a wide range of movements and functions. They are voluntary muscles, meaning that we can control how and when they move. Skeletal muscles make up between 30% and 40% of our total body mass and consist of flexible muscle fibres that range from less than half an inch to just over 3 inches in diameter. These fibres contract, allowing the muscles to move bones. Each muscle can contain thousands of fibres, which are surrounded by different types of sheaths or coverings.
Smooth muscles are involuntary muscles, meaning we cannot control them. They are found in internal organs and eyes, and help with functions such as moving food through the digestive tract and changing pupil size. Cardiac muscles are also involuntary and are only found in the heart, where they contract to pump blood throughout the body. Cardiac muscle fibres are branched and interconnected, allowing for a coordinated contraction that beats the heart.
Muscle fibres work together to move the body and its organs through a process that involves a change in electric charge, known as depolarization. This can be initiated by a nerve impulse or, in the case of the heart, by pacemaker cells. This leads to a complex chain reaction within the muscle fibres, resulting in a release of energy and subsequent muscle contraction.
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Frequently asked questions
There are more than 600 muscles in the human body, making up around half of a person's body weight.
There are three types of muscle tissue: skeletal, smooth, and cardiac. Skeletal muscles are the most common, making up 30-40% of total body mass.
Muscles are responsible for the movement of the human body. They also support and move organs, such as the heart, which beats to keep you alive.
Muscles are made of thousands of small fibres woven together. These fibres are called myofibrils, which contain contractile units known as sarcomeres.
Occasional muscle soreness is normal, but long-term pain, weakness or trouble moving could be a sign of a more serious issue. Seek medical advice if symptoms persist for more than a week.
