Identify the three (3) main parts of the muscular system and briefly explain the purpose of each.

The three main parts of the muscular system are:

1. Skeletal Muscles: These are the muscles that we can see and feel. They are attached to the bones and are responsible for all voluntary movements. They help in maintaining posture and body position. They also generate heat during physical activities, which helps in maintaining body temperature.

2. Smooth Muscles: These muscles are found in the walls of hollow organs like the stomach, intestines, blood vessels, and bladder. They are involuntary muscles, which means we cannot control their movements consciously. They help in various functions like moving food through the digestive tract, controlling the flow of blood, and emptying the bladder.

3. Cardiac Muscles: These muscles are found in the heart. They are also involuntary muscles. They contract to pump blood throughout the body. The unique feature of cardiac muscles is that they can set their own rhythm of contraction and relaxation, which is crucial for maintaining the heartbeat.