How do your muscles work? | Year 3 Science PDF Download

Understanding Muscles

• Muscles are crucial components found throughout our body, enabling us to perform various movements and actions.
• For instance, when we consciously decide to move our arm muscles, they respond accordingly. On the other hand, muscles like the heart function involuntarily, ensuring continuous circulation without conscious effort.
• Muscles operate in pairs, working in tandem to facilitate movement by pulling on bones. When a muscle contracts, it shortens, and upon relaxation, it returns to its original length.

Joint Movement and Muscle Function

• The skeletal system features joints that enable movement as muscles contract and relax. Some joints, such as those in the shoulder and hip, offer high flexibility, while others like the knee and elbow have more limited movement.
• Certain joints like those in the spine and neck have restricted mobility compared to others.

Importance of Protein for Muscle Growth

• A well-balanced diet rich in protein is essential for proper muscle development and repair. Protein sources such as meat, fish, eggs, and dairy products are beneficial for muscle health.
• Consuming adequate protein supports muscle growth and repair processes, aiding in overall muscle function and strength.

Number of Muscles in the Human Body

• The human body contains over 600 muscles, distributed from the toes to the tongue, each serving various functions in movement and stability.