Victor Forge
Our bodies have over 600 muscles that help us do everything from moving our body to breathing and staying alive. They help us move, sit still, stand up straight, and maintain our body temperature. They also help us move our eyes to look around, push food through our digestive system, and pump blood through our heart and blood vessels. Muscles are made up of thousands of small elastic fibres that contract and relax to cause movement. When muscles don't perform optimally, it can significantly impact our quality of life.
| Characteristics | Values |
|---|---|
| Number of muscles in the body | More than 600 |
| Muscle type | Skeletal, cardiac, smooth |
| Muscle composition | Tissue, thousands of small elastic fibres |
| Muscle functions | Movement, breathing, swallowing, digestion, pumping blood, keeping the body alive |
| Muscle control | Some muscles are under conscious control, others are not |
| Muscle maintenance | Exercise, balanced diet |
| Muscle appearance | Striated (striped) appearance due to red and white muscle fibres |
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Skeletal muscles
There are over 600 skeletal muscles in the human body, and they make up a significant proportion of an individual's body weight. Males tend to have more skeletal muscle mass than females, and muscle mass generally decreases with age. Maintaining strong and healthy skeletal muscles is essential for overall health and can be achieved through physical activity and exercise.
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Smooth muscles
Smooth muscle is one of the three main types of muscle, the others being skeletal and cardiac muscle. Smooth muscle is an involuntary muscle, meaning it works automatically without conscious input. It gets its name from its smooth appearance, which is different from most other types of muscle. Smooth muscle is found throughout the body and serves a variety of functions.
Smooth muscle is located in the walls of hollow organs, including the stomach, intestines, bladder, and uterus. It is also found in the walls of blood vessels and lymph vessels (excluding blood and lymph capillaries), where it is known as vascular smooth muscle. Smooth muscle plays a vital role in regulating blood pressure and circulation. It is also involved in the respiratory, urinary, and reproductive systems.
In the eyes, smooth muscle controls how the pupils dilate or constrict, and how the eyes focus. In the skin, smooth muscle causes hairs to stand on end, such as with goosebumps. Smooth muscle is also involved in the process of childbirth, as it is responsible for contractions during labor.
Smooth muscle differs from skeletal muscle in structure and function. Smooth muscle cells have a spindle shape with narrow ends, a wider middle, and are shorter in length. They also demonstrate greater elasticity, which is important for organ systems like the intestines and urinary bladder. Smooth muscle is controlled by the autonomic nervous system and can be divided into two subgroups: single-unit and multi-unit smooth muscle.
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Cardiac muscles
Muscles are pieces of soft tissue that help the body move, breathe, swallow, and stay alive. There are more than 600 muscles in the human body, although some sources place this figure at 650.
Cardiac muscle, also known as myocardium, is one of three types of muscle in the body, along with skeletal and smooth muscle. Cardiac muscle makes up the thick middle layer of the heart, between the outer layer of the heart wall (the pericardium) and the inner layer (the endocardium). Cardiac muscle is under involuntary control—it beats on its own without any input.
Cardiac muscle is composed of individual cardiac muscle cells, or cardiomyocytes, joined by intercalated discs. Cardiomyocytes are contractile myocytes of the cardiac muscle. They are surrounded by an extracellular matrix produced by supporting fibroblast cells. The primary function of cardiac muscle is to pump blood into circulation by generating sufficient force. To accomplish this, the cardiac muscle must contract with enough force to supply the metabolic demands of the entire body. The heart may use anaerobic processes in a limited capacity.
Cardiac muscle cells contain branched fibres connected via intercalated discs that contain gap junctions and desmosomes. These interconnections allow the cardiomyocytes to contract together synchronously to enable the heart to work as a pump. The sheets of muscle that wrap around the left ventricle closest to the endocardium are oriented perpendicularly to those closest to the epicardium. When these sheets contract in a coordinated manner, they allow the ventricle to squeeze in several directions simultaneously – longitudinally (becoming shorter from apex to base), radially (becoming narrower from side to side), and with a twisting motion (similar to wringing out a damp cloth) to squeeze the maximum possible amount of blood out of the heart with each heartbeat.
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Muscle contraction
The contraction process can be described in terms of two variables: length and tension. Muscle contractions can produce changes in length and tension simultaneously, and neither is likely to remain constant when the muscle is active. If the muscle length shortens, the contraction is called concentric; if the muscle length lengthens, it is called eccentric. An example of an eccentric contraction is walking, as the quadricep muscles are active when the heel touches the ground and the knee bends or straightens in stride.
The foundation for muscle contraction is the sarcomere, found in all muscle cells. Sarcomeres contain a motor protein called myosin, which powers the muscle to contract by "grabbing" onto another protein called actin and "flexing." When the myosin releases the actin, the muscle relaxes. This process is regulated by another protein called troponin.
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Muscle movement
Muscles are pieces of soft tissue that help the body perform a wide range of movements and functions. There are more than 600 muscles in the human body, making up over 40% of our weight. These muscles work together with bones to help us move.
The musculoskeletal system comprises one of the body's major tissue/organ systems. The three main types of muscle tissue are skeletal, cardiac, and smooth muscle groups. Skeletal muscles are voluntary muscles that connect to bones and allow us to perform a wide range of movements and functions. They make up between 30% and 40% of our total body mass. Skeletal muscle fibres contract (tighten), which allows the muscles to move bones so we can perform lots of different movements. Each muscle can contain thousands of fibres.
Cardiac muscle, or myocardium, makes up the middle layers of the heart. It doesn't exist anywhere else in the body. Cardiac muscle squeezes and relaxes to pump blood through the cardiovascular system. Cardiac muscle is an involuntary muscle, meaning it beats on its own without our input.
Smooth muscles are also involuntary muscles. They line the inside of some organs and perform essential jobs like moving waste through the intestines and helping the lungs expand when we breathe. Smooth muscles play an important role in many body systems, including the reproductive, urinary, respiratory, and digestive systems.
Muscles are made of elastic tissue that allows each type to carry out its particular job. They are made of thousands of small elastic fibres, similar to rubber bands, that contract and relax to cause movement. When the fibres contract, they get shorter, which pulls the bones they're connected to closer together. The principal functionality of muscle is rooted in its ability to contract and relax.
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Frequently asked questions
Muscles are made up of thousands of small elastic fibres that contract and relax to cause movement. There are over 600 muscles in the human body.
Muscles help the body perform a myriad of functions, from involuntary ones like breathing to voluntary ones like walking. They also help the body perform actions like chewing food and moving it through the digestive system.
There are three types of muscle tissue in the body: skeletal, smooth, and cardiac. Skeletal muscles are voluntary muscles that support your weight and move you. Smooth muscles are involuntary muscles that line the inside of some organs. Cardiac muscles are also involuntary and make up the heart.
When muscles don't perform optimally, it can significantly impact one's quality of life. For example, if the diaphragm is compromised, it may lead to difficulty breathing and potential respiratory failure.
To keep your muscles healthy, it is recommended to eat a balanced diet with fruits and vegetables, whole grains, low-fat dairy, and lean proteins. Certain kinds of exercises, like lifting weights, can also make your muscles stronger.
