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Our bodies are made up of around 600 muscles, which help us move, breathe, swallow, and stay alive. Muscles are attached to bones by tendons and work in pairs to move our joints. They contract and relax to cause movement, either voluntarily (when we consciously control the movement) or involuntarily (when our nervous system controls the movement). Skeletal muscles are the most common type of muscle in our bodies and are attached to our bones, allowing us to perform a wide range of movements and functions. Cardiac and smooth muscles are the other two types of muscles, which work involuntarily to perform essential functions such as pumping blood and moving waste through our intestines.
| Characteristics | Values |
|---|---|
| Number of muscles in the human body | 600 |
| Types of muscles | Skeletal, Smooth, Cardiac |
| Muscle composition | Thousands of elastic fibres bundled tightly together |
| Muscle movement | Contraction, Relaxation |
| Muscle control | Voluntary, Involuntary |
| Muscle coordination | Cerebellum, Motor cortex |
| Muscle health | Stretching, Warming up, Physical activity |
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What You'll Learn
- Skeletal muscles are voluntary and make up 30-40% of body mass
- Smooth muscles are involuntary and control essential functions like breathing and waste removal
- Cardiac muscles are also involuntary and help pump blood through the body
- Muscles are made of thousands of elastic fibres bundled together
- Muscles can only pull, not push, so they work in pairs to move joints
Skeletal muscles are voluntary and make up 30-40% of body mass
Muscles are pieces of soft tissue that help us move, breathe, swallow, and stay alive. There are about 600 muscles in the human body, and they make up around 40% of body weight in healthy young adults. The three main types of muscle are skeletal, smooth, and cardiac.
Skeletal muscles are the most common muscles in the human body. They are attached to the bones and allow movement. They also play a vital role in everyday activities like walking, running, and performing other physical activities. Skeletal muscles are voluntary, meaning you control how and when they work. They make up 30 to 40% of your total body mass. Tendons (tough bands of connective tissue) attach skeletal muscle tissue to bones throughout your body. Your shoulder muscles, hamstring muscles, and abdominal muscles are all examples of skeletal muscles.
Skeletal muscles use more calories than other organs. At rest, they consume 54.4 kJ/kg (13.0 kcal/kg) per day, which is larger than the amount of fat or bone. Skeletal muscles are also susceptible to various disorders, including muscular dystrophies, congenital myopathies, inflammatory disorders, and diseases affecting the neuromuscular junction. These disorders can lead to muscle weakness, pain, loss of movement, and even paralysis.
To keep your skeletal muscles strong and healthy, it is important to do regular strength conditioning and resistance exercises, eat a nutritious and balanced diet, maintain a healthy body weight, and stretch and warm up before physical activity.
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Smooth muscles are involuntary and control essential functions like breathing and waste removal
Muscles are pieces of soft tissue that help us move, breathe, swallow, and perform other essential functions to keep us alive. There are about 600 muscles in the human body, and they perform two types of movements: voluntary and involuntary. Voluntary movements are actions we control, while involuntary movements are done without our conscious awareness.
The body has three types of muscle: skeletal, cardiac, and smooth. Smooth muscles are involuntary muscles that line the inside of some organs, including the stomach, intestines, bladder, and uterus. They do essential jobs like moving waste through the intestines and helping the lungs expand when we breathe. Smooth muscles are also found in the walls of blood vessels, where they help maintain blood pressure by squeezing the stream of blood flowing through the vessels.
Smooth muscle is a type of muscle tissue that works automatically and is part of the body's most important functions, including blood pressure, circulation, vision, and digestion. It gets its name from its smooth appearance, which differs from most other types of muscle. Smooth muscles work without conscious thought and handle some of the body's most critical automatic jobs. Smooth muscle conditions can disrupt how body systems work, and symptoms can vary depending on the affected muscles and their functions.
Smooth muscle is found in the walls of hollow organs, passageways, and tracts in the body. It is also present in the eye, skin, and respiratory, urinary, and reproductive systems. Smooth muscle cells contract slower than skeletal muscle cells but are stronger, more sustained, and require less energy. They are controlled by the nervous system and influenced by various neural elements, resulting in a coordinated response. Smooth muscle is essential for sealing orifices and transporting substances through wavelike contractions.
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Cardiac muscles are also involuntary and help pump blood through the body
Muscles are pieces of soft tissue that help us move, breathe, swallow, and stay alive. They perform two types of movements: voluntary and involuntary. Voluntary movements are actions we control, while involuntary movements are automatic and controlled by the nervous system.
Cardiac muscle, also called myocardium, is one of three major categories of muscles in the human body, the other two being smooth muscle and skeletal muscle. Cardiac muscle is a specialized, organized type of tissue that exists only in the heart. It is responsible for the contractility of the heart and, therefore, the pumping action. The heart is made up of three layers, with the myocardium forming the middle layer. The walls of the heart's chambers are composed almost entirely of cardiac muscle fibres.
Cardiac muscle cells contain mitochondria, which convert oxygen and glucose into energy in the form of adenosine triphosphate (ATP). Cardiac muscle cells appear striated or striped under a microscope due to alternating filaments of myosin and actin proteins. When a cardiac muscle cell contracts, the myosin filament pulls the actin filaments towards each other, causing the cell to shrink. The cell uses ATP to power this contraction.
Cardiac muscle is involuntary, meaning it contracts and relaxes automatically without conscious control. The contractile functions of the heart are coordinated by electrical impulses from the nervous system. These impulses are generated by pacemaker cells, which control heart rate and determine how fast the heart pumps blood. The primary function of cardiac muscle is to pump blood into circulation by generating sufficient force to meet the metabolic demands of the entire body.
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Muscles are made of thousands of elastic fibres bundled together
Muscles are pieces of soft tissue that help us move, breathe, swallow, and perform other essential functions to keep us alive. There are about 600 muscles in the human body, and they make up one of the body's major tissue/organ systems. The three main types of muscle tissue are skeletal, smooth, and cardiac muscle groups. Skeletal muscles are part of the musculoskeletal system and work with our bones, tendons, and ligaments to support our weight and move us. They are attached to bones by tendons and are under our conscious control, which is why they are also known as voluntary muscles.
Skeletal, smooth, and cardiac muscles have very different functions, but they share the same basic composition. A muscle is made up of thousands of elastic fibres bundled tightly together. Each bundle is wrapped in a thin transparent membrane called a perimysium. An individual muscle fibre is made up of blocks of proteins called myofibrils, which contain a specialised protein (myoglobin) and molecules to provide the oxygen and energy required for muscle contraction. Each myofibril contains filaments that fold together when given the signal to contract. This shortens the length of the muscle fibre, which, in turn, shortens the entire muscle if enough fibres are stimulated at the same time.
The brain, nerves, and skeletal muscles work together to cause movement, and this is collectively known as the neuromuscular system. A typical muscle is serviced by anywhere between 50 and 200 (or more) branches of specialised nerve cells called motor neurones. The cerebellum coordinates the muscle movements ordered by the motor cortex. Sensors in the muscles and joints send messages back through peripheral nerves to tell the cerebellum and other parts of the brain where and how the arm or leg is moving and what position it's in. This feedback results in smooth, coordinated motion.
Smooth, or involuntary, muscle is also made of fibres, but this type of muscle looks smooth, not striated. We can't consciously control our smooth muscles; instead, they are controlled by the nervous system automatically. Smooth muscle is found in the walls of the stomach and intestines, helping to break up food and move it through the digestive system. It is also found in the walls of blood vessels, where it helps maintain blood pressure. Cardiac muscle is found in the heart, with the walls of the heart's chambers composed almost entirely of muscle fibres. Like smooth muscle, cardiac muscle is also an involuntary type of muscle.
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Muscles can only pull, not push, so they work in pairs to move joints
Muscles are pieces of soft tissue that help us move, breathe, swallow, and perform other essential functions to keep us alive. There are about 600 muscles in the human body, and they perform both voluntary and involuntary movements.
Voluntary movements are actions that we consciously control, such as raising our arm or rotating our head. Involuntary movements, on the other hand, are controlled by the nervous system without our conscious input, such as the movement of food through our digestive system.
Skeletal muscles, which are attached to bones, provide the necessary tug on the bones to enable bending, straightening, and supporting joints. However, muscles can only contract, or pull, and cannot push. When we bend a joint, such as our elbow, the flexor muscle contracts, and then relaxes to allow the extensor muscle to contract and straighten the joint. This is why muscles work in pairs or groups, with one muscle contracting while the other relaxes, allowing for a full range of motion. For example, the biceps and triceps muscles in the arm work in opposition to control the movement of the elbow joint.
The interplay between muscles, joints, and bones creates a series of lever systems, where the input force of muscle contraction results in the output force of limb movement. This coordinated motion is achieved through the neuromuscular system, where the brain, nerves, and skeletal muscles work together.
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Frequently asked questions
We have muscles to help us move and perform everyday physical activities. They also help us breathe, swallow, and pump blood around our bodies.
Muscles are attached to bones by tendons. They work in pairs of flexors and extensors. When a muscle contracts, it gets shorter and pulls on the bone it is attached to. When the movement is complete, the muscle relaxes and returns to its normal size, and the other muscle in the pair contracts to extend or straighten the limb.
There are three main types of muscle: skeletal, smooth, and cardiac. Skeletal muscles are voluntary muscles that we control consciously. Smooth and cardiac muscles are involuntary, meaning they are controlled by the nervous system without our input.
