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Muscles are essential to life. They allow us to move, sit still, stand up straight, jump in the air, chew our food, and move our eyes to look around. They also perform many processes that we cannot actively control, such as keeping our hearts pumping, moving food through our guts, and making us blush. Muscles work by contracting and relaxing. This process is powered by a motor protein called myosin, which grabs onto another protein called actin and flexes. When the myosin releases the actin, the muscle relaxes.
| Characteristics | Values |
|---|---|
| Function | To move our bodies |
| Functionality | Contraction and relaxation |
| Contraction | Powered by the sarcomere, a motor protein called myosin that "grabs" onto another protein called actin and "flexes" |
| Relaxation | Occurs when myosin releases actin |
| Regulation | Regulated by another protein called troponin |
| Energy | Derived from food |
| Repair | Can build new muscles through exercise by making use of their ability to repair themselves when damaged |
| Connection to bones | Connected to bones with a special kind of tissue called a tendon |
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What You'll Learn
Muscles move our bodies by contracting
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.
Muscles are connected to bones with a special kind of tissue called a tendon. A special muscle in your chest called the diaphragm helps the lungs fill with air when you breathe.
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Muscles are connected to bones by tendons
The principal functionality of muscle is rooted in its ability to contract and relax. Muscles contract to generate movement, and they need energy from our food to do this. They also need signals from our brains. When we exercise, we build new muscles by taking advantage of their ability to repair themselves when damaged.
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.
If the diaphragm, the muscle that supports movement of air in the lungs, is compromised, it may lead to difficulty breathing and potential respiratory failure. Similarly, for the heart to function well, it relies on the ability of the cardiac muscle to contract and pump blood throughout the body.
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Muscles need energy from food to contract and move
Muscles are connected to bones with a special kind of tissue called a tendon, which helps us to move. They also help us to sit still and stand up straight, and allow us to move our eyes to look around.
Muscles are responsible for many processes that we cannot actively control, such as keeping our hearts pumping, moving food through our guts, and even making us blush. They also help move air in our bodies so that we can speak and breathe.
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Muscles help push food through the digestive system
Muscles are responsible for pushing food through the digestive system. They do this by contracting and relaxing, which generates movement. This movement is powered by a motor protein called myosin, which contracts the muscle by 'grabbing' onto another protein called actin. When the myosin releases the actin, the muscle relaxes. This process is regulated by another protein called troponin.
Muscles also help us to chew our food, and they are connected to bones by a special kind of tissue called a tendon. They are essential to life and require energy from our food to contract and move.
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Muscle contraction is powered by motor proteins
Muscles are responsible for many of the body's functions, from allowing us to consciously move our limbs, jump in the air, and chew our food, to keeping our hearts pumping, moving food through our guts, and even making us blush.
Sarcomere malfunctions that cause decreased or increased contractility of the muscle play a central role in diseases like heart failure with reduced ejection fraction (HFrEF) and hypertrophic cardiomyopathy (HCM Disease). Therapies with the potential to modulate sarcomere function may improve the lives of patients suffering from these diseases.
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Frequently asked questions
Muscles work by contracting and relaxing. This generates movement. Muscles need energy from food to contract and move.
When muscles don't perform optimally, it can have a significant impact on quality of life. For example, if the diaphragm muscle is compromised, it can lead to difficulty breathing and potential respiratory failure.
There are many different types of muscles in the body, including the diaphragm, which helps the lungs fill with air, and the cardiac muscle, which pumps blood throughout the body.
