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Humans have over 600 muscles in their bodies, which are used for a variety of functions, from eating and breathing to playing the piano and running. The human body has three types of muscles: skeletal, smooth, and cardiac. The color of human muscles is not uniform and varies depending on the type of muscle and its location in the body. Smooth muscles, which are found in the stomach, intestines, bladder, and uterus, are pale pink. In contrast, skeletal and cardiac muscles have a red-brown color due to the presence of myoglobin.
| Characteristics | Values |
|---|---|
| Number of muscles in the human body | Over 600 |
| Muscle composition | Actin and myosin filaments, myofibrils, sarcomeres, proteins, lipids, amino acids, metabolites, small RNAs |
| Muscle weight in the human body | 35%-40% of total body weight |
| Muscle colour | Red-brown (striated muscle), pale pink (smooth muscle) |
| Muscle types | Skeletal muscle, cardiac muscle, smooth muscle |
| Muscle functions | Movement, maintaining body posture, controlling body temperature, stabilizing joints, producing endocrine secretions |
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What You'll Learn
The human body has over 600 muscles
There are three main types of muscle: skeletal, smooth, and cardiac. Skeletal muscle, also known as muscle fibre, is the specialised tissue that is attached to bones and allows movement. It accounts for over 600 or even 650 muscles in the human body. Skeletal muscles can be found all over the body and make up around 35-40% of body weight in healthy young adults. They are typically attached by tendons to bones of a skeleton. Skeletal muscle cells are much longer than the other types of muscle tissue and are also known as muscle fibres. The tissue of skeletal muscle is striated, having a striped appearance due to the arrangement of the sarcomeres.
Smooth muscle, on the other hand, is located in various internal structures, including the digestive tract, uterus, and blood vessels such as arteries. It is arranged in layered sheets that contract in waves along the length of the structure. Smooth muscle does not have a significant amount of myoglobin and is pale pink in colour, unlike skeletal and cardiac muscle, which are red-brown.
Cardiac muscle is a special type of muscle tissue found only in the heart. It is organised into fibres and has a striated appearance. Individual cardiac muscle cells are closely connected to each other, enabling the heart to beat in a coordinated fashion. Cardiac muscle contracts in response to electrical impulses created by a special type of cell in the heart.
The colour of muscles and other tissues in the human body is the result of complex biochemical reactions that produce biological pigments. For example, red-brown cytochromes and porphyrins are found in blood, the liver, spleen, kidneys, and striated muscle. Brown-black melanins are found in the skin, brain nuclei, and other organs. Dark-brown lipochromes are associated with ageing organs.
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Smooth muscles are pale pink
Human muscles can be classified into three categories: skeletal muscles, cardiac muscles, and smooth muscles. Skeletal muscles can be further categorized into red and white muscles. Red muscles are dense with capillaries and are rich in myoglobin and mitochondria, giving them a characteristic red appearance. White muscles, on the other hand, have fewer mitochondria and lower levels of myoglobin, resulting in a whitish colour.
Smooth muscles, which are found in organs such as the stomach, intestines, bladder, and uterus, are pale pink in colour. This is in contrast to skeletal and cardiac muscles, which have a significant amount of myoglobin and are typically red or brown. The pale pink colour of smooth muscles is due to the absence of a significant amount of myoglobin, a pigment that is present in higher concentrations in skeletal and cardiac muscles.
Myoglobin is a protein that plays a crucial role in oxygen storage and transportation in muscles. It is responsible for the red colour observed in skeletal and cardiac muscles. However, smooth muscles have a lower demand for oxygen and, therefore, do not require high levels of myoglobin. As a result, they exhibit a paler pink hue compared to the more intensely coloured red and white skeletal muscles.
The colour of human muscles is determined by the presence of various biological pigments, including myoglobin, cytochromes, and melanins. These pigments are the result of complex biochemical reactions that occur within the body. While smooth muscles are typically pale pink, it is important to note that the colour of muscles can vary slightly between individuals and may be influenced by additional factors such as blood flow, oxygen concentration, and the presence of other pigments or compounds.
In summary, smooth muscles exhibit a distinct pale pink colour due to their lower myoglobin content compared to skeletal and cardiac muscles. This colour differentiation reflects the varying physiological functions and oxygen requirements of different muscle types in the human body.
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Skeletal muscles are red-brown
The human body has more than 600 skeletal muscles, making up around 35%-40% of body weight in healthy young adults. They are part of the voluntary muscular system and are attached by tendons to the bones of the skeleton. They are responsible for producing movement, maintaining body posture, controlling body temperature, and stabilizing joints.
The colour of skeletal muscles is distinct from that of smooth muscles, which are found in organs such as the stomach, intestines, bladder, and uterus. Smooth muscles have a pale pink colour due to their lower myoglobin content.
The red-brown colour of skeletal muscles is a result of their high energy demands and diverse fibre composition. The presence of myoglobin, a protein that stores oxygen in muscles, contributes to the red-brown hue. This colouration is also observed in cardiac muscle, highlighting the unique characteristics of skeletal and cardiac muscles compared to smooth muscles.
Additionally, the colour of skeletal muscles can vary depending on their state. For example, when muscles are exercised regularly, they may appear more defined and have a slightly darker tone due to increased blood flow and oxygenation. Conversely, a lack of exercise or disuse can lead to muscle atrophy, resulting in a decrease in muscle size and a potential change in their colour appearance.
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Extraocular muscles are linked to neurogenic and myogenic disease
Human muscles are reddish, with colours ranging from red-brown to dark red, depending on the volume of circulating blood and oxygen concentration. Smooth muscles, such as those found in the stomach, intestines, bladder, and uterus, are pale pink.
Extraocular muscles (EOMs) are highly specialized skeletal muscles that control eye movements. They are distinct from other skeletal muscles and have unique properties that make them selectively vulnerable or resistant to certain disorders. EOMs are selectively spared in Duchenne muscular dystrophy and motor neuron disease, but they are targeted in chronic progressive external ophthalmoplegia (CPEO), myasthenia gravis, and Graves' ophthalmopathy.
EOMs exhibit resistance to muscle dystrophies and sarcopenia due to their endowment of different types of myogenic cells, which have excellent regenerative potential. These myogenic cells are influenced by neurotrophins, which promote myoblast proliferation, enhance myogenic fusion rates, and protect myotubes from inflammatory stimuli. Studies have shown that EOM-derived cells express higher levels of neurotrophins and their receptors than other cranial and limb muscles. This suggests that intrinsic trophic differences may explain the higher proliferative and fusion rates, as well as the better regenerative properties of EOM-derived myogenic progenitors.
The neuromuscular junction (NMJ) is a highly developed synapse that links motor neuron activity with muscle contraction. Neurological presentations are among the most common clinical phenotypes associated with mtDNA deletions, which can impact the onset and severity of various diseases, including neurogenic and myogenic disorders. While single clonal mtDNA deletions have been associated with human disease, the interpretation of extraocular muscular pathology remains challenging. Myopathic changes in the extraocular muscles have been observed in conjunction with, or as a result of, chronic denervation.
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Muscle fibres are composed of actin and myosin filaments
The human body is made up of more than 600 skeletal muscles, which comprise around 40% of body weight in healthy young adults. Skeletal muscles are bundles of muscle fibres, which are single large cells formed by the fusion of many individual cells during development. Each muscle fibre is composed of several hundred to several thousand myofibrils, which are cylindrical bundles of two types of filaments: thick filaments of myosin and thin filaments of actin.
The contraction of skeletal muscle is triggered by nerve impulses, which stimulate the release of calcium ions from the sarcoplasmic reticulum, a specialised network of internal membranes that store high concentrations of calcium ions. The increased concentration of calcium ions in the cytosol signals muscle contraction via the action of two accessory proteins bound to the actin filaments: tropomyosin and troponin. Tropomyosin is a fibrous protein that binds lengthwise along the groove of actin filaments, while troponin is a protein complex that binds to calcium ions. These proteins control when the actin-binding sites are exposed for binding to myosin, initiating the cross-bridge cycling that causes skeletal muscle contraction.
The structure of the sarcomere includes the M line, where myosin filaments are anchored together, and the H band, which contains the M line and is the central region of the sarcomere containing only myosin filaments. The A band is a larger portion of the sarcomere that includes regions of actin and myosin overlap, while the I band covers the terminal regions of two adjacent sarcomeres and contains only actin filaments. During contraction, the H and I bands shorten while the A band remains a constant length due to the sliding of the filaments over each other.
The colour of human muscles is not a result of the actin and myosin filaments, but rather the result of complex biochemical reactions that produce biological pigments. The pigments responsible for the colour of skeletal muscle are red-brown cytochromes and porphyrins.
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Frequently asked questions
Human muscles are not typically visible, but the smooth muscles in human organs (such as the stomach, intestines, bladder, and uterus) are pale pink.
The colors of human organs are the result of complex biochemical reactions that produce biological pigments.
Biological pigments include red-brown cytochromes and porphyrins, brown-black melanins, and dark-brown lipochromes.
