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Pre-Session Assignment (PSA) #7 Name ______________________________________________ On most PSAs you will have vocabulary related to the chapter(s) under discussion. When provided, you should complete the vocabulary-matching section(s). To help you begin the review process, you should complete the first three objectives for each chapter. Doing so will help you prepare for recitation and for the quiz. You are highly encouraged to complete the rest of the objectives to keep you on track in preparing for the lecture exam and it will help you to identify areas where you may need to ask for clarification during recitation. All answers can be found in the textbook or lecture outlines. On occasion your recitation may cover material that has not been covered in lecture. Please refer to the textbook in those circumstances. The objectives may be slightly reworded in the PSA, but the expected answer will not change. Chapter 40 Objectives: Movement (Muscles) 1

2 ____ thin myofilaments ____ found in smooth muscle and is the point where actin is anchored ____ an axon and all of the muscle fibers it innervates ____ a muscle that works with another in a particular movement ____ region in center of H zone that holds sarcomere myosin filaments together ____ runs length of myosin fiber (will contain actin and overlapping myosin) ____ in a sarcomere it includes the Z line and the actin filaments up to the point where they overlap with the myosin filaments ____ a muscle cell ____ a muscle that opposes the movement of another muscle ____ a cytoplasmic grouping of myofilaments ____ plasma membrane of a muscle cell ____ thick myofilaments ____ a region of the sarcomere that is myosin only, between the ends of the actin ____ an individual contractile unit in skeletal muscle ____ actin and myosin filaments that make up ____ region in skeletal muscle cells that includes the arrangement SR-T tubule-SR ____ a protein complex located on tropomyosin, containing a Ca2 + binding site that regulates the interaction of actin and myosin ____ inward extension of the sarcolemma membrane, that runs through the cell ____ the endoplasmic reticulum in a muscle cell ____ the point where actin is anchored at beginning and end of a sarcomere ____ a protein chain that regulates the interaction of actin and myosin by covering the actin binding sites on myosin when calcium is absent A. A Band B. Actin C. Agonist D. Antagonist E. Dense Body F. H Zone G. I Band H. M Line I. Motor Unit J. Myofiber K. Myofibril L. Myofilament M. Myosin N. Sarcolemma O. Sarcomere P. Sarcoplasmic Reticulum Q. Triad R. Troponin S. Tropomyosin T. T Tubule U. Z Line

1. Describe the structural organization of a skeletal muscle cell along with the structure of the sarcomere (drawing helpful! ) 2. Label the zones and describe the events within a sarcomere as it contracts and relaxes. 3. Compare and contrast skeletal, cardiac, and smooth muscle structure and function/contraction. (drawing helpful! ) 3

4. Describe the electrical and chemical events leading up to skeletal muscle contraction. 5. Distinguish between contraction, relaxation, agonists, antagonists, myofiber, myofibril and myofilament. 6. Describe major factors that influence the strength and duration of muscle contraction (examples are energy source, sarcomere length, calcium cycling, muscle fiber type, frequency of stimulation, sarcomere length 7. Compare and contrast a single twitch, summation, tetanus, and muscle tone. 8. Describe and define a motor unit 9. Give examples of contractile cells and tissues in invertebrates. 4

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