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The human body contains around 600 muscles, which are responsible for a range of functions, from pumping blood and supporting movement to lifting heavy weights or giving birth. Muscles work by contracting or relaxing to cause movement, which may be voluntary or involuntary. The muscular system consists of various types of muscle, including striated muscle (or skeletal muscle), smooth muscle, and cardiac muscle. Smooth muscle is under involuntary control and is found in the walls of blood vessels and structures such as the urinary bladder, intestines, and stomach. Cardiac muscle, on the other hand, makes up the mass of the heart and is responsible for its rhythmic contractions. The muscular system is crucial for functions such as mobility, stability, posture, and circulation, allowing us to move, speak, chew, and control our heartbeat, breathing, and digestion.
| Characteristics | Values |
|---|---|
| Number of muscles in the human body | 600 |
| How muscles work | By contracting or relaxing to cause movement |
| Type of movement | Voluntary (made consciously) or involuntary (done without our conscious awareness) |
| What fuels muscles | Glucose from carbohydrates in our diet |
| What else muscles need to work properly | Particular minerals, electrolytes and other dietary substances such as calcium, magnesium, potassium and sodium |
| Types of muscle | Striated muscle (or skeletal muscle), smooth muscle, and cardiac muscle |
| Smooth muscle function | Under involuntary control and found in the walls of blood vessels and of structures such as the urinary bladder, the intestines, and the stomach |
| Cardiac muscle function | Makes up the mass of the heart and is responsible for the rhythmic contractions of that vital pumping organ; it too is under involuntary control |
| Muscular system functions | Mobility, stability, posture, circulation, and more |
| Muscles allow a person to | Move, speak, and chew |
| Muscles control | Heartbeat, breathing, and digestion |
| Other muscular system functions | Temperature regulation and vision |
| Largest muscle in the human body | Gluteus maximus in the buttocks |
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What You'll Learn
Types of muscle: striated, smooth, and cardiac
Human muscles function by contracting or relaxing to cause movement. This movement may be voluntary or involuntary. Muscles allow a person to move, speak, and chew. They control heartbeat, breathing, and digestion. They also help with temperature regulation and vision.
There are about 600 muscles in the human body. They can be divided into three types: striated muscle (or skeletal muscle), smooth muscle, and cardiac muscle. Striated muscle is under voluntary control and is concerned with movement, posture, and balance. Smooth muscle is under involuntary control and is found in the walls of blood vessels and structures such as the urinary bladder, the intestines, and the stomach. Cardiac muscle makes up the mass of the heart and is responsible for its rhythmic contractions. It is also under involuntary control.
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How muscles work: contracting and relaxing
Human muscles work by contracting and relaxing to cause movement. This movement may be voluntary (made consciously) or involuntary (done without our conscious awareness). There are about 600 muscles in the human body, accounting for around 40% of a person's weight. The largest muscle in the body is the gluteus maximus in the buttocks.
The muscular system consists of various types of muscle that play a crucial role in the function of the body. Muscles allow a person to move, speak, and chew. They control heartbeat, breathing, and digestion. They also have other functions, including temperature regulation and vision.
Muscles can be divided into striated muscle (or skeletal muscle), smooth muscle, and cardiac muscle. Smooth muscle is under involuntary control and is found in the walls of blood vessels and structures such as the urinary bladder, the intestines, and the stomach. Cardiac muscle makes up the mass of the heart and is responsible for its rhythmic contractions. With very few exceptions, the arrangement of smooth and cardiac muscle in humans is identical to that found in other vertebrate animals.
Multiple muscles in the back function specifically in movements of the back. For example, the erector spinae muscles extend and side bend the back. The small muscles of the vertebrae (the multifidi and rotators) help rotate, extend, and side bend the back. The quadratus lumborum muscle in the lower back side bends the lumbar spine and aids in the inspiration of air.
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Muscles and movement: voluntary and involuntary
The human body has about 600 muscles, which account for around 40% of a person's weight. Muscles have a range of functions, from pumping blood and supporting movement to lifting heavy weights or giving birth. They allow a person to move, speak, and chew. They also control heartbeat, breathing, and digestion.
Muscles work by either contracting or relaxing to cause movement. This movement may be voluntary, meaning the movement is made consciously, or involuntary, meaning it is done without our conscious awareness. For example, the erector spinae muscles extend the back (bend it backward) and side bend the back. The semispinalis dorsi and semispinalis capitis muscles also extend the back. The small muscles of the vertebrae (the multifidi and rotators) help rotate, extend, and side bend the back.
Smooth muscle and cardiac muscle are under involuntary control. Smooth muscle is found in the walls of blood vessels and structures such as the urinary bladder, the intestines, and the stomach. Cardiac muscle makes up the mass of the heart and is responsible for the rhythmic contractions of that vital pumping organ. With very few exceptions, the arrangement of smooth and cardiac muscle in humans is identical to the arrangement found in other vertebrate animals.
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Muscles and the skeletal system: posture and balance
The human body has about 600 muscles, which account for around 40% of a person's weight. Muscles work by contracting or relaxing to cause movement. This movement may be voluntary or involuntary. Muscles are responsible for a range of functions, including pumping blood, supporting movement, lifting heavy weights, giving birth, speaking, chewing, controlling heartbeat, breathing, and digestion.
The muscular system consists of various types of muscle, including striated muscle (or skeletal muscle), smooth muscle, and cardiac muscle. Smooth muscle is under involuntary control and is found in the walls of blood vessels and structures such as the urinary bladder, intestines, and stomach. Cardiac muscle makes up the mass of the heart and is responsible for its rhythmic contractions.
The muscles in the back are specifically responsible for movements of the back, such as extending, side-bending, and rotating the spine. For example, the erector spinae muscles extend and side bend the back, while the small muscles of the vertebrae (the multifidi and rotators) help rotate, extend, and side bend the back.
The skeletal system, which is worked by the muscles, is responsible for posture and balance. The largest muscle in the body is the gluteus maximus in the buttocks, which is part of the skeletal system and plays a crucial role in maintaining posture and balance.
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Muscles and digestion: chewing and breathing
The human body has about 600 muscles, which are responsible for a range of functions, from pumping blood and supporting movement to lifting heavy weights or giving birth. Muscles work by contracting or relaxing to cause movement, which may be voluntary (conscious) or involuntary (unconscious).
The muscular system consists of various types of muscle, including striated muscle (or skeletal muscle), smooth muscle, and cardiac muscle. Smooth muscle is under involuntary control and is found in the walls of blood vessels, the urinary bladder, the intestines, and the stomach. Cardiac muscle makes up the mass of the heart and is responsible for its rhythmic contractions.
Muscles are essential for breathing, chewing, and digestion. The erector spinae muscles, for example, extend and side bend the back, while the semispinalis dorsi and semispinalis capitis muscles also extend the back. The small muscles of the vertebrae (the multifidi and rotators) help rotate, extend, and side bend the back, which is important for maintaining posture and balance.
The quadratus lumborum muscle in the lower back aids in the inspiration of air through its stabilizing effects at the 12th rib. This muscle helps to expand the chest cavity, allowing for deeper breathing and increased oxygen intake.
Additionally, muscles in the face and jaw enable chewing and speaking. These muscles work together to open and close the jaw, grind food, and form words and sounds.
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Frequently asked questions
Human muscles function by contracting or relaxing to cause movement. This movement may be voluntary or involuntary.
Human muscle is divided into striated muscle (or skeletal muscle), smooth muscle, and cardiac muscle.
Striated muscle, or skeletal muscle, is under voluntary control and is concerned with movement, posture, and balance.
Smooth muscle is under involuntary control and is found in the walls of blood vessels and structures such as the urinary bladder, the intestines, and the stomach.
Cardiac muscle makes up the mass of the heart and is responsible for its rhythmic contractions. It is also under involuntary control.
