The human skeletal muscles are the only human voluntary muscle that controls every action that human consciously performs. They make about 40% of the human muscle mass. Many skeletal muscles are attached to 2 bones across a joint and move the two bones closer to each other. They are found in various parts of the body such as;
- Legs- gastrocnemius muscles, quadriceps, and hamstring
- Arm- such as the biceps and triceps
- The scalenus anterior, scalenus medius and, trapezius are the skeletal muscles in the neck region that support the neck and also allow movement of the neck and head.
- Skeletal muscles are also found in the abdomen, back and in the face.
Skeletal muscles are vital part of human body that;
Skeletal muscles allow movements that are related to pushing, pulling and lifting. The contraction and relaxation of the skeletal muscles send nerve impulses to the brain to bring movement. Contraction means that the muscle shortens in response to stimuli. After contracting, the skeletal muscle returns to its original length. However, injury can cause skeletal muscles to lengthen beyond its normal limit. Lifting eyebrows, smiling and frowning are some of the movements that are caused by skeletal muscles in the face.
Leg and abdominal skeletal muscles provide the movements that are required for the sitting motion while the gluteus maximus muscles provide a cushion for sitting.
Stabilization and maintaining posture
Skeletal muscles are responsible for stabilization and maintaining proper body posture. Skeletal muscle makes adjustments to keep us standing upright or sitting well. Without these muscles, you cannot sit well or maintain proper body posture. They make the body stable thus enabling you to maintain proper body posture. Workout programs like Old School New Body are great for building muscle and building more muscles for stabilization of your body.
Regulate body temperature
Another role of skeletal muscles is regulating body temperature. If optimal body temperature is not maintained, chemical reactions such as metabolic processes would come to a standstill. By contracting and relaxing, skeletal muscles aid in controlling body temperature. When your body gets cold in cold weather, skeletal muscles contract to generate more heat. However, on a warm weather, the erector pili muscles relax to cool the body.
Skeletal muscles in the diaphragm are involved in sneezing, breathing, coughing and laughing
Diseases and disorders of skeletal muscles
There are many diseases and disorders of the skeletal muscles. Some of the common diseases and disorders are;
This is a skeletal muscles disorder that is common in females. It is characterized by degenerative changes in skeletal muscle and inflammation. The disorder causes muscle atrophy and symmetric weakness.
This is a chronic illness that is characterized by fatigue and diffuse pain. The disorder is genetic affecting certain families.
Chronis fatigue syndrome (CFS)
This is a skeletal muscles illness characterized by prolonged fatigue, muscle and joint pain, loss of concentration and memory.
This is a disease of skeletal muscles that is not caused by nerve disorder. They are mainly caused by chemical poisoning, drug side effects and disorder of the immune system
This is a common disorder that results from the breakdown of the skeletal muscle fiber. There are no specific causes of rhabdomyolysis.