<P> Muscle cells (myocytes) are elongated cells ranging from several millimetres to about 10 centimetres in length and from 10 to 100 micrometres in width . These cells are joined together in tissues that may be either striated or smooth, depending on the presence or absence, respectively, of organized, regularly repeated arrangements of myofibrillar contractile proteins called myofilaments . Striated muscle is further classified as either skeletal or cardiac muscle . Striated muscle is typically subject to conscious control, while smooth muscle is not . Thus, muscle tissue can be described as being one of three different types: </P> <Ul> <Li> Skeletal muscle, striated in structure and under voluntary control, is anchored by tendons (or by aponeuroses at a few places) to bone and is used to effect skeletal movement such as locomotion and to maintain posture . (Though postural control is generally maintained as an unconscious reflex--see proprioception--the muscles responsible also react to conscious control like non-postural 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). It also has striations unlike smooth muscle . </Li> <Li> Smooth muscle, neither striated in structure nor under voluntary control, is found within the walls of organs and structures such as the esophagus, stomach, intestines, bronchi, uterus, urethra, bladder, blood vessels, and the arrector pili in the skin (in which it controls erection of body hair). </Li> </Ul> <Li> Skeletal muscle, striated in structure and under voluntary control, is anchored by tendons (or by aponeuroses at a few places) to bone and is used to effect skeletal movement such as locomotion and to maintain posture . (Though postural control is generally maintained as an unconscious reflex--see proprioception--the muscles responsible also react to conscious control like non-postural 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). It also has striations unlike smooth muscle . </Li> <Li> Smooth muscle, neither striated in structure nor under voluntary control, is found within the walls of organs and structures such as the esophagus, stomach, intestines, bronchi, uterus, urethra, bladder, blood vessels, and the arrector pili in the skin (in which it controls erection of body hair). </Li>

How does the structure of skeletal muscle tissue relate to its function
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