Muscles are special parts of the body that can get shorter or longer, making the body move or stay still. They are very important for the system that helps the body move and stay strong.
Kinds of Muscles
The body has three kinds of muscles: skeletal, smooth, and cardiac.
- Skeletal Muscles: These are muscles that we can choose to move. They are connected to bones by strong cords called tendons. They help us do things like walk or lift things.
- Smooth Muscles: These are muscles that we cannot choose to move. They are in the walls of organs and things like the food pipe, stomach, guts, air tubes, womb, pee tube, and blood vessels. They work by themselves.
- Cardiac Muscle: This is also a muscle that we cannot choose to move, but it is a special kind of muscle that is only in the heart. It makes the heart beat.
Muscle Parts
Each muscle is made of muscle cells, which are long, round cells that have more than one center. These cells have smaller parts called myofibrils, which have thin strings of protein, mainly actin and myosin. These strings slide past each other when the muscle gets shorter or longer. This is called the sliding filament idea.
Muscle Work
The main work of muscles is to make force. When a muscle gets shorter, it pulls on the bones that it is connected to, and makes the body move. Muscles also help the body stay in the right shape and keep the joints steady.
Muscle Care
Keeping muscles healthy is good for the whole body and how it moves. Doing exercise often, eating well, and sleeping enough are important things for keeping and making muscles healthy. Doing exercises that make the muscles work hard are especially good for making the muscles bigger and stronger.
To sum up, muscles are very important parts of the human body, helping the body move and stay stable. Knowing how they are made and how they work is good for keeping the body healthy and active.
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