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The human body has more than 600 muscles, which are made up of thousands of small fibres. They do everything from pumping blood around the body to helping us lift heavy objects. Muscles can pull on bones, but they can't push them back to their original position, so they work in pairs of flexors and extensors. The human body has three different types of muscles: smooth, cardiac and skeletal.
| Characteristics | Values |
|---|---|
| Number of muscles in the human body | More than 600 |
| Muscle function | Pumping blood, lifting heavy objects |
| Muscle composition | Elastic tissue, thousands of small fibres |
| Muscle control | Some muscles are controlled consciously, others are not |
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What You'll Learn
There are more than 600 muscles in the human body
The human body has more than 600 muscles, which together account for about 40% of a person's weight. These muscles are made of thousands of small fibres woven together, and there are three different types: smooth muscles, cardiac muscles, and skeletal muscles. Smooth muscles are sometimes called involuntary muscles and are usually in sheets or layers, with one layer of muscle behind the other. Cardiac muscles are the muscles of the heart, and skeletal muscles are attached to bones by tendons. Muscles can pull on bones, but they can't push them back to their original position, so they work in pairs of flexors and extensors. The extensor muscle relaxes and stretches as the flexor muscle contracts to bend the joint. The flexor relaxes and the extensor contracts to straighten (or extend) the limb at the same joint. Muscles get their signals to contract and relax from the brain.
Healthcare providers usually only classify muscles based on the type of tissue they're made of, but it's common to group muscles together by their location (like chest muscles, leg muscles, or back muscles) or what kind of movement they perform (abductors, flexors, or extensors, for example). Some muscles move your body, while others help your internal organs keep you alive. You control some of your muscles, while others do their jobs without you thinking about them at all.
While most people associate muscles with strength, they do more than assist in lifting heavy objects. The 650 muscles in the body not only support movement but also help to maintain posture and circulate blood and other substances throughout the body, among other functions. Muscles are often associated with activities of the legs, arms, and other appendages, but muscles also produce more subtle movements, such as facial expressions, eye movements, and respiration.
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Muscles can pull on bones but can't push them back to their original position
Muscles are made up of thousands of small fibres. There are more than 600 muscles in the human body, which do everything from pumping blood around the body to helping us lift heavy objects.
The human body has three different types of muscles: smooth muscles, which are usually in sheets or layers; cardiac muscles, which are found in the heart; and skeletal muscles, which are attached to bones. Smooth and skeletal muscles are both able to contract and pull the tendons to move the bones.
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Muscles work in pairs of flexors and extensors
The human body has more than 600 muscles, which are constantly in use, whether you're aware of it or not. Some muscles you can see and feel, especially after a workout, while others, like your heart, keep you alive without you having to think about them.
Muscles can pull on bones, but they can't push them back to their original position, so they work in pairs of flexors and extensors. The extensor muscle relaxes and stretches as the flexor muscle contracts to bend the joint. Then, the flexor relaxes and the extensor contracts to straighten the limb at the same joint. For example, the biceps flex the arm, while the triceps extend it.
The brain is the command centre of the body, sending signals down through the spinal cord and nerves to control all of our muscles. Every time you move your hand, run, or even stand still, the brain coordinates countless commands to ensure your muscles work in harmony.
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Smooth muscles are sometimes called involuntary muscles
The human body has more than 600 muscles, which are made of the same material: a type of elastic tissue. There are three different types of muscles in the body: smooth, cardiac and skeletal. Smooth muscles are sometimes called involuntary muscles because they contract and move without conscious control. They are found lining the internal organs, such as the oesophagus, stomach, intestine, blood vessels, iris of the eye, and dermis of the skin. They are also called non-striated or un-striped muscles because they lack striations when viewed under a microscope. Smooth muscles are generally associated with the viscera or internal organs that exhibit regular, slow contractions and involuntary actions. The autonomic nervous system controls involuntary muscle movement.
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Some muscles are visible and can be felt, especially after a workout
There are more than 600 muscles in the human body, and they are constantly in use, whether you're aware of it or not. Some muscles are visible and can be felt, especially after a workout. This is because muscles are made of thousands of small fibres, and when they contract and relax, they can become more prominent and easier to feel. Muscles work in pairs of flexors and extensors, with one muscle contracting as the other relaxes to allow for movement. For example, when you bend your arm, the flexor muscle contracts to bend the joint, while the extensor muscle relaxes and stretches.
The body's muscles can be grouped by their location, such as chest, leg, or back muscles, or by the type of movement they perform, like abductors, flexors, or extensors. Healthcare providers typically classify muscles based on the type of tissue they're made of, which is a type of elastic tissue similar to a rubber band.
Some muscles, like the heart and those lining certain organs, work silently in the background to keep us alive. These involuntary muscles, also known as smooth muscles, are usually found in layers, with one layer of muscle behind the other.
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Frequently asked questions
You have more than 600 muscles in your body.
There are three types of muscle: skeletal, smooth and cardiac.
Your muscles do everything from pumping blood around your body to helping you lift heavy objects.
No, you can't control all of your muscles. Your brain and body tell your smooth muscles what to do without you even thinking about it.
