A
: a body tissue consisting of long cells that contract when stimulated and produce motion
b
: an organ that is essentially a mass of muscle tissue attached at either end to a fixed point and that by contracting moves or checks the movement of a body part

Understanding Muscles
Muscles are essential components of the human body that facilitate movement and maintain posture. They work in harmony with the skeletal system and the nervous system to enable various bodily functions.
Types of Muscles
Muscles are primarily classified into three types:
- Skeletal Muscles:
- These are voluntary muscles connected to bones.
- They facilitate movement by contracting and relaxing.
- Cardiac Muscles:
- Found only in the heart, these muscles are involuntary.
- They pump blood throughout the body and work continuously without fatigue.
- Smooth Muscles:
- Involuntary muscles found in walls of hollow organs like the stomach and intestines.
- They help in processes such as digestion and blood circulation.
Function of Muscles in Relation to the Skeletal System
- Muscles attach to bones via tendons, forming a crucial connection.
- When muscles contract, they pull on bones, producing movement at joints.
- The skeletal system provides structure and support, while muscles enable mobility.
Role of the Nervous System
- The nervous system is vital in controlling muscle movements.
- It sends signals from the brain to muscles, instructing them when to contract or relax.
- This coordination allows for precise movements, such as writing or playing sports.
Conclusion
In summary, muscles play a pivotal role in the human body, working alongside the skeletal and nervous systems to enable movement, support bodily functions, and maintain overall health. Understanding these systems helps us appreciate how our bodies work effectively.