Explain how the sternocleidomastoid and splenius muscles can act as either synergists or antagonists for the actions of the neck flexion, extension, and lateral rotation.
Muscles are made up of protein filaments of actin and myosin that move past each other. It consists of skeletal, cardiac, and smooth types of tissues each one performing a different function in the body. It is the most abundant tissue in animals making up about 50 to 60 percent of total body weight.
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from Biology 105: Anatomy & PhysiologyChapter 6 / Lesson 3