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Your muscular system also powers internal process’s such as:
Even when the body sleeps your muscular system is never still:
There are three types of muscle:
Skeletal muscle (voluntary muscle) which is anchored by tendons to bone and is used to effect skeletal movement such as:
Though this postural control is generally maintained as a subconscious reflex muscles also react to conscious control.
Smooth muscle (involuntary muscle) is found within the walls of organs and structures such as:
Unlike skeletal muscle, smooth muscle is not under conscious control.
Cardiac muscle
Muscles can only contract (shorten) in other words they have the ability to pull and are unable to push. Therefore, they are arranged in pairs.
Positional Sense
Muscle contain numerous sensors known as neuromuscular spindles (modified muscle fibre ). Sensory nerve fibres wrapped around the modified muscle fibre send information to the brain about muscle length and tension as the muscle stretches. Other receptors are found in ligaments and tendons and together they create the body’s sense of of its own position and posture. This is known as proprioception.
The typical body contains 640 muscles An average adult male is made up of 42% of skeletal muscle and an average adult female is made up of 36% (as a percentage of body mass).[1]
1. Marieb, Elaine; Katja Hoehn (2007). Human Anatomy & Physiology (7th ed.). Pearson Benjamin Cummings. p. 317.