• The human body has three types of muscle tissues: skeletal, smooth, and cardiac.

• Skeletal muscles consist of groups of fibers. Muscle fibers contain myofibrils made up of protein filaments.

• During a muscle contraction, myosin and actin filaments interact to shorten the length of a sarcomere.

• Most skeletal muscles are arranged in opposing pairs.

Vocabulary muscle fiber (p. 917) striation (p. 917) voluntary muscle (p. 917) involuntary muscle (p. 918)

myofibril (p. 919) myosin (p. 919) actin (p. 919) Z line (p. 919)

sarcomere (p. 919) tendon (p. 921) origin (p. 921) insertion (p. 921)

flexor (p. 921) extensor (p. 921) muscle fatigue (p. 922) oxygen debt (p. 922)

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