Muscles have several main functions, including locomotion, heat production, structural support and muscle contractions. Muscles are dense and account for nearly 40 percent of the body's weight.Continue Reading
There are three primary types of muscles: skeletal muscles, smooth muscles and cardiac muscle. Skeletal muscles control movements of the body. Limb movement occurs when muscle fibers attached to the bones contract. Muscle contraction is a voluntary response controlled by neural functions that release the energy needed to cause the reaction. The framework, posture and joints of the body are supported by skeletal muscles. Skeletal muscles also contribute to heat production when necessary, which is a sign of metabolic activity. Cardiac muscles are located exclusively in the heart. Blood circulation is dependent on cardiac muscle contractions, which supply the body with oxygenated blood.
Muscle tissue is cased in a material made up of connective tissue called fascia. Inside the fascia are bundles of muscle fibers known as fasciculus that are directly responsible for muscle function. Individual muscle fibers are multinucleated and striated, surrounded by a material called perimysium. These fibers are surrounded by sarcoplasm and a cell membrane called sarcolemma. Myofibrils are protein-based filaments found in the sarcoplasm that contain the necessary information for proper muscle fiber function.Learn more about Muscles
The function of intercostal muscle is to assist in respiration. There are 11 each of internal and external intercostal muscles in the human body.Full Answer >
The function of the abdominal muscles are to protect the internal organs in the abdominal and pelvic regions and provide postural support. There is not one, but several muscles involved in the support of the abdominal area.Full Answer >
According to About.com, the function of the rectus femoris muscle is to enable knee extension and hip flexion. The rectus femoris, along with five other hip flexors, is responsible for flexion that draws the legs towards the trunk of the body.Full Answer >
The function of the biceps brachii muscle is to help the arm to bend at the elbow, according to WebMD. The muscle does this by extending and contracting as it moves back and forth.Full Answer >