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Human muscles are one of the four basic types of animal tissue, made of thousands of small fibres woven together to move the body and its organs. There are about 600 muscles in the human body, and they make up about 40% of its total weight. Muscles perform voluntary and involuntary movements, and are classified into three types: skeletal, smooth, and cardiac. Skeletal muscles are attached to bones and allow movement, smooth muscles are located in various internal structures such as the digestive tract, and cardiac muscles encompass the heart.
| Characteristics | Values |
|---|---|
| Number of muscles in the human body | 600 |
| Muscle composition | Thousands of small fibres woven together |
| Types of muscle tissue | Skeletal, cardiac, smooth |
| Skeletal muscle composition | Actin and myosin fibres, tendons, perimysium |
| Skeletal muscle movement | Voluntary |
| Cardiac muscle composition | Actin and myosin fibres |
| Cardiac muscle movement | Involuntary |
| Smooth muscle composition | Actin and myosin fibres |
| Smooth muscle movement | Involuntary |
| Muscle function | Contraction and relaxation |
| Muscle movement types | Voluntary, involuntary |
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What You'll Learn
Humans have over 600 muscles
Skeletal muscles are attached to bones and enable movement and posture control. They are also known as voluntary muscles as they are under conscious control. Skeletal muscles work with bones, tendons, and ligaments to support body weight and facilitate movement. Tendons attach skeletal muscles to bones, and these muscles contract voluntarily, under the influence of the central nervous system.
Cardiac muscle, or myocardium, makes up the middle layers of the heart. It is an involuntary, striated muscle that contracts to pump blood and propel it through the body, ensuring proper oxygenation and maintenance of cells. Cardiac muscle cells are located in the walls of the heart and exhibit a striped appearance.
Smooth muscle is found in the walls of various hollow organs, such as the liver, pancreas, intestines, lungs, reproductive organs, and blood vessels. It is also present in the gastrointestinal, reproductive, urinary, vascular, and respiratory systems. Smooth muscle is arranged in layered sheets that contract in waves, and its movement occurs involuntarily without conscious awareness.
The human body's ability to move and function is made possible by the intricate interplay of these three types of muscle tissues, each with its unique structure, function, and control mechanism.
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Skeletal muscle
There are over 600 skeletal muscles in the human body, making up around 30% to 40% of body weight in healthy young adults. Skeletal muscles are voluntary muscles, meaning that you consciously control how and when they move and work. They are attached to bones by tendons and are part of the musculoskeletal system. They support your bones, maintain your posture, and allow you to perform a wide range of movements and functions.
There are two major classifications of skeletal muscle: Type I (slow oxidative) and Type II (fast-twitch). The diversity in the makeup of skeletal muscle leads to variations in the speed and length of contractions in different muscle groups, depending on their specific function. Skeletal muscles also contribute to energy metabolism and act as a storage source for amino acids that different organs of the body can use for synthesizing organ-specific proteins.
The development of skeletal muscles begins during embryogenesis, with the para-axial mesoderm undergoing stepwise differentiation to generate muscle tissue. After birth, satellite cells act as stem cells and are responsible for further growth and development. The skeletal muscle is supplied with blood by a primary artery, which gives off tributaries known as feed arteries. The terminal arteriole, along with the capillaries that it supplies, is known as a microvascular unit, which is the smallest unit in the skeletal muscle where blood flow can be regulated.
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Smooth muscle
The human body has over 600 muscles, which help us move, breathe, and perform other vital functions. There are three major types of muscle tissue: skeletal, cardiac, and smooth. This text will focus on smooth muscle, its structure, functions, and the systems it is involved in.
Additionally, smooth muscle has specific roles in different parts of the body. For example, it causes goosebumps when hairs stand on end due to cold temperatures or fear. In the eyes, smooth muscle controls how the pupils dilate or constrict and helps adjust the shape of the lens for proper focus. During labour, smooth muscle contractions occur in the uterus. Smooth muscle is also present in the skin, reproductive organs, blood vessels, gastrointestinal tract, respiratory system, and urinary system.
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Cardiac muscle
Human muscles are pieces of soft tissue that help the body to move and perform various functions. There are three types of muscle tissue in the human body: skeletal, smooth, and cardiac.
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Voluntary and involuntary movements
Human muscles are pieces of soft tissue that help the body perform a variety of functions, from moving the body to breathing and even keeping the body alive. There are over 600 muscles in the human body, constituting around 40% of total body weight. These muscles are made up of thousands of small fibres woven together, allowing them to stretch and press together to move the body and its organs.
Muscles are broadly classified into three types: skeletal, smooth, and cardiac. Skeletal muscles are attached to bones and help with movement and posture. They are under voluntary control, meaning that they move when you consciously decide to move that part of your body. For example, the muscles in your arms and legs are under your conscious control.
Smooth muscles, on the other hand, are found inside organs like the blood vessels, stomach, intestines, liver, pancreas, and reproductive organs. They are under involuntary control and help with the movement of substances through these organs. Smooth muscles also contribute to the contraction and tone of the vascular system.
Cardiac muscles are found only in the heart and are responsible for pumping blood throughout the body. They are also involuntary muscles, meaning they beat automatically without conscious control. The heart is a vital involuntary muscle, as its continuous function is essential for keeping the human body alive.
While most muscles are either voluntary or involuntary, some actions, like breathing, can be both. Voluntary muscles require conscious effort and energy and can get tired, whereas involuntary muscles are designed to work continuously without tiring.
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Frequently asked questions
Muscles are pieces of soft tissue that help the body perform various functions, from pumping blood and supporting movement to lifting heavy weights or giving birth.
There are about 600 muscles in the human body.
There are three types of muscle tissue: skeletal, smooth, and cardiac. Skeletal muscles are attached to the skeleton and are responsible for voluntary movements. Smooth muscles are located in the walls of many organs and carry out involuntary movements. Cardiac muscles are the involuntary muscles that make up the heart.
Muscles work by contracting or relaxing to cause movement. Individual muscle fibres are made up of proteins called myofibrils, which contain a specialised protein called myoglobin. These fibres receive signals to contract, shortening the length of the muscle fibre and, in turn, shortening the entire muscle.
