Dominic Stone
The human body is made up of an estimated 600 muscles, with some experts claiming there are as many as 840. The number varies because anatomists have different ways of deciding whether a given muscle is one muscle with multiple parts or if it should be considered multiple distinct muscles. There are three main types of muscle: skeletal, smooth and cardiac.
| Characteristics | Values |
|---|---|
| Total number of muscles in the human body | Between 600 and 840 |
| Number of named skeletal muscles | Over 650 |
| Number of smooth muscle cells | Billions |
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What You'll Learn
There are over 600 muscles in the human body
The number of muscles in the human body is not entirely clear, with some experts saying the body has close to 600 muscles and others saying it may be as many as 840. This discrepancy exists because anatomists have different ways of deciding whether a given muscle is one muscle with multiple parts or if it should be considered multiple distinct muscles.
Adding to the confusion is the fact that researchers occasionally discover new muscles, such as a newly defined muscle in the jaw identified in a 2022 study. Because of such factors, most sources report on the safe side that there are at least 600 muscles in the human body.
The muscles of the human body perform a variety of vital functions, including facilitating movement, moving food through the digestive tract, and working to allow the heart to pump blood.
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There are three main types of muscle: skeletal, smooth and cardiac
There are about 600 muscles in the human body, with some experts estimating that there could be as many as 840. There are three main types of muscle: skeletal, smooth and cardiac.
Skeletal muscles are attached to bones by tendons and are responsible for movement. There are over 650 named skeletal muscles in the human body.
Smooth muscles are found in the walls of organs and structures such as the stomach, bladder, and blood vessels. They are not under conscious control and function involuntarily. There are billions of smooth muscle cells in the human body.
Cardiac muscles are found in the heart and are responsible for the heart's contraction and relaxation, facilitating the pumping of blood around the body.
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Muscles work by contracting or relaxing to cause movement
There are over 600 muscles in the human body, with some estimates ranging up to 840. The three main types of muscle are skeletal, smooth, and cardiac. The brain, nerves, and skeletal muscles work together to cause movement, and this is known as the neuromuscular system.
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 muscles in our digestive tract move food along without us having to think about it.
The human body has over 650 named skeletal muscles, and billions of smooth muscle cells. Smooth muscle tissue occurs on a cellular level.
The muscles in our body perform a variety of vital functions, such as facilitating movement, pumping blood, and supporting movement. Glucose from carbohydrates in our diet fuels our muscles.
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The brain, nerves and skeletal muscles work together to cause movement
The human body has around 600 muscles, although some estimates put the number as high as 840. The three main types of muscle are skeletal, smooth and cardiac.
A typical muscle is serviced by between 50 and 200 branches of specialised nerve cells called motor neurones. These plug directly into the skeletal muscle. The tip of each branch is called a presynaptic terminal. The point of contact between the presynaptic terminal and the muscle is called the neuromuscular junction.
The brain sends a message to the motor neurones. This triggers the release of the chemical acetylcholine from the presynaptic terminals. The muscle responds to acetylcholine by contracting. This movement may be voluntary (meaning the movement is made consciously) or done without our conscious awareness (involuntary).
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There are over 650 named skeletal muscles in the human body
The three main types of muscle include skeletal, smooth, and cardiac. The brain, nerves, and skeletal muscles work together to cause movement – this is collectively known as the neuromuscular system. The muscles of the human body perform a variety of vital functions, such as facilitating movement, moving food through the digestive tract, and working to allow the heart to pump blood.
Muscles work by either contracting or relaxing to cause movement. This movement may be voluntary, meaning the movement is made consciously, or done without our conscious awareness (involuntary). Glucose from carbohydrates in our diet fuels our muscles.
In addition to the over 650 named skeletal muscles, there is also other muscle tissue, such as smooth muscle, which typically occurs on a cellular level. This means that you can actually have billions of smooth muscle cells in your body.
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Frequently asked questions
There are around 600 muscles in the human body, but some estimates put the number at 650 or even 840.
There are three main types of muscle: skeletal, smooth and cardiac.
Muscles have a range of functions, from pumping blood and supporting movement to lifting heavy weights or giving birth.
Muscles work by either contracting or relaxing to cause movement. This movement may be voluntary (made consciously) or involuntary (done without our conscious awareness).
Glucose from carbohydrates in our diet fuels our muscles.
