A mechanism that activates specific muscles in our ears is a leftover from our evolutionary past, back when our ancestors depended more on their hearing for survival.

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Involuntary cardiac and smooth muscles are responsible for contraction of the heart and movement of substances through hollow organ systems, respectively, and voluntary skeletal muscles are ...

Muscles commonly tested include abductors (that move a limb away from the center of the body), flexors (used to bend a joint, such as the elbow), and extensors (used to unbend a joint and/or bend it ...