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Are youaware that you actually possess six senses？ The sixth is a muscular senseresponsible fｏｒdirecting your muscles intelligently to the exact extentnecessary fｏｒeach action you perform. Fｏｒexample， when you reach fｏｒan object， the sensory nerves linking the muscles tothe brain stop your hａｎｄ&emsp；at the correct spot. This automatic perception of theposition of your muscles in relation to the object is your muscular sense inaction.
Musclesare stringly bundles of fibers varying from one five-thousandth of an inch toabout three inches. They have three unique characteristics， they can become shorter ａｎｄ&emsp；thicker； they canstretch； ａｎｄ&emsp；they can retract to their original positions. Under a high-poweredmicroscope， muscle tissue is seen as long， slender cells with a grainy texture likewood.
More thanhalf of a person‘s body is composed of musclefibers， most of which are involuntary—in other words， work without conscious direction. The voluntary muscles， those that we move consciously to performparticular actions， number more than five hundred.Women have only 60 to 70 percent as much muscle as men fｏｒtheir body mass. Thatis why an average woman can’t lift as much， throw as far， ｏｒhit as hard as an average man.
Accordingto the ｓｅｌｅｃｔion， the muscular sense is responsiblefｏｒ______.
A. t...