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Muscles are the parts of the body that allow us to move and show how strong we are. There are two types of skeletal muscle: fast twitch and slow twitch. Skeletal muscles are also known as striated muscles because they have a striped appearance. This is due to the light and dark parts of the muscle fibres. The musculoskeletal system is made up of the body's muscles and skeleton. Muscles come in a variety of shapes, including triangular, saw-like, and diamond-shaped. The size of a muscle can also be used to distinguish between two muscles in the same region. For example, the gluteal region contains three muscles: the gluteus maximus, gluteus medius, and gluteus minimus. Facial muscles are unique in that they do not attach directly to the bone but instead attach under the skin, allowing for a wide range of expressions.
| Characteristics | Values |
|---|---|
| Shape | Delta or triangular (deltoids), serrated or saw-like (serratus muscles), rhombus or diamond (rhomboid major), etc. |
| Size | Gluteal region contains three muscles differentiated by size: gluteus maximus (large), gluteus medius (medium), and gluteus minimus (smallest) |
| Type | Skeletal muscles (striated), fast-twitch, slow-twitch |
| Colour | Red (due to tiny blood vessels called capillaries) |
| Facial muscles | Attach under the skin, allowing for small movements and a wide range of facial expressions |
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What You'll Learn
- Skeletal muscles are striped, with light and dark parts
- The deltoids are triangular, the serratus muscles are serrated, and the rhomboid major is diamond-shaped
- Facial muscles attach under the skin, allowing for a wide range of expressions
- Muscles are made up of lots of tiny blood vessels called capillaries, which make them look red
- To look big, focus on bulking out your biceps and abs
Skeletal muscles are striped, with light and dark parts
Skeletal muscles are the ones that show how strong you are and let you kick a football. They are also known as striated muscles because they have light and dark parts that make them look striped. This is the kind of muscle you think of when you think of muscles. They are voluntary muscles, which means you can control what they do.
Skeletal muscles are classified into two broad types: fast twitch and slow twitch. They have lots of tiny blood vessels called capillaries, which make them look red, and they have many mitochondria, which are sites of energy production. They also have lots of myoglobin, which is the oxygen-transporting and storage protein of the muscle.
The size of a skeletal muscle can be used to distinguish between two muscles found in the same region. For example, the gluteal region contains three muscles differentiated by size: the gluteus maximus (large), gluteus medius (medium), and gluteus minimus (smallest). The direction in which the muscle fibres run can also be used to identify a muscle. In the abdominal region, there are several sets of wide, flat muscles. The muscles whose fibres run straight up and down are the rectus abdominis, the ones running transversely (left to right) are the transverse abdominis, and the ones running at an angle are the obliques.
Facial muscles are another type of skeletal muscle. Unlike other skeletal muscles, they don't all attach directly to bone. Instead, many of them attach under the skin, which allows you to contract your facial muscles just a tiny bit and make dozens of different kinds of faces.
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The deltoids are triangular, the serratus muscles are serrated, and the rhomboid major is diamond-shaped
The shape of a muscle can be used to distinguish between two muscles found in the same region. For example, the deltoids are triangular, the serratus muscles are serrated, and the rhomboid major is diamond-shaped. The gluteal region contains three muscles differentiated by size: the gluteus maximus (large), gluteus medius (medium), and gluteus minimus (smallest). In the abdominal region, the rectus abdominis muscles run straight up and down, the transverse abdominis run transversely (left to right), and the obliques run at an angle.
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Facial muscles attach under the skin, allowing for a wide range of expressions
Skeletal muscles are the ones that show how strong you are and are sometimes called striated muscles because the light and dark parts of the muscle fibres make them look striped. They are voluntary muscles, which means you can control what they do. Your face also has plenty of muscles, and many of them attach under the skin, rather than directly to bone. This allows you to contract your facial muscles just a tiny bit and make dozens of different kinds of faces. Even the smallest movement can turn a smile into a frown.
The shape of muscles varies depending on their type. For example, the deltoids have a triangular shape, the serratus muscles feature a serrated or saw-like shape, and the rhomboid major is a rhombus or diamond shape. The size of the muscle can also be used to distinguish between two muscles found in the same region. For example, the gluteal region contains three muscles differentiated by size: the gluteus maximus (large), gluteus medius (medium), and gluteus minimus (smallest).
To get a highly muscled look, you need to bulk out certain muscles, such as the biceps and abs. Skeletal muscle is classified into two broad types: fast twitch and slow twitch. It has lots of tiny blood vessels called capillaries (and so looks red), many mitochondria (sites of energy production), and lots of myoglobin (the oxygen-transporting and storage protein of the muscle).
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Muscles are made up of lots of tiny blood vessels called capillaries, which make them look red
The size of the muscle can be used to distinguish between two muscles found in the same region. For example, the gluteal region contains three muscles differentiated by size: the gluteus maximus (large), gluteus medius (medium), and gluteus minimus (smallest). The direction in which the muscle fibres run can also be used to identify a muscle. In the abdominal region, there are several sets of wide, flat muscles. The muscles whose fibres run straight up and down are the rectus abdominis, the ones running transversely (left to right) are the transverse abdominis, and the ones running at an angle are the obliques.
Skeletal muscle is classified into two broad types: fast twitch and slow twitch. It has lots of tiny blood vessels called capillaries, which make it look red. It also has many mitochondria (sites of energy production) and lots of myoglobin (the oxygen-transporting and storage protein of the muscle).
Facial muscles don't all attach directly to bone like they do in the rest of the body. Instead, many of them attach under the skin. This allows you to contract your facial muscles just a tiny bit and make dozens of different kinds of faces. Even the smallest movement can turn a smile into a frown.
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To look big, focus on bulking out your biceps and abs
Your skeletal muscles are the ones that show how strong you are. They are also known as striated muscles because they have light and dark parts that make them look striped. Skeletal muscles are voluntary, meaning you can control what they do.
The size of a muscle can be used to distinguish between two muscles found in the same region. For example, the gluteal region contains three muscles: the gluteus maximus (large), gluteus medius (medium), and gluteus minimus (smallest).
In the abdominal region, there are several sets of wide, flat muscles. The rectus abdominis run straight up and down, the transverse abdominis run transversely (left to right), and the obliques run at an angle.
Skeletal muscle is classified into two types: fast twitch and slow twitch. It has lots of tiny blood vessels called capillaries, which make it look red, and many mitochondria, which are sites of energy production.
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Frequently asked questions
Muscles are striated, meaning they have light and dark parts that make them look striped.
Muscles can be distinguished by their size and shape. For example, deltoids are triangular, serratus muscles are serrated or saw-like, and rhomboid major is a rhombus or diamond shape.
Muscles are red due to the presence of many tiny blood vessels called capillaries.
Yes, facial muscles attach under the skin, rather than directly to the bone, allowing for a wide range of expressions.
Skeletal muscles are the muscles that show how strong you are. They are voluntary, meaning you can control what they do.
