![]() ![]() The heart contracts and relaxes without our conscious awareness. Cardiac muscle – the muscle specific to the heart.Another common term is involuntary muscle, since the motion of smooth muscle happens without our conscious awareness. Smooth muscle is arranged in layered sheets that contract in waves along the length of the structure. Smooth muscle – located in various internal structures including the digestive tract, uterus and blood vessels such as arteries.Another term is striated muscles, since the tissue looks striped when viewed under a microscope. Skeletal muscles are under our conscious control, which is why they are also known as voluntary muscles. Generally speaking, skeletal muscle is grouped into opposing pairs such as the biceps and triceps on the front and back of the upper arm. Together, skeletal muscles and bones are called the musculoskeletal system (also known as the locomotor system). Skeletal muscle – the specialised tissue that is attached to bones and allows movement.Muscle disorders may cause weakness, pain or even paralysis. To work properly, muscle tissue also needs particular minerals, electrolytes and other dietary substances such as calcium, magnesium, potassium and sodium.Ī range of problems can affect muscles – these are collectively known as myopathy. Glucose from carbohydrates in our diet fuels our muscles. This movement may be voluntary (meaning the movement is made consciously) or done without our conscious awareness (involuntary). ![]() Muscles work by either contracting or relaxing to cause movement. Muscles have a range of functions from pumping blood and supporting movement to lifting heavy weights or giving birth. There are about 600 muscles in the human body.
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