EBK HUMAN BIOLOGY
11th Edition
ISBN: 8220100545931
Author: MCMILLAN
Publisher: Cengage Learning US
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Chapter 6, Problem 2RQ
In the diagram below, label the fine structure of a muscle, down to one of its myofibrils. Identify the basic unit of contraction in a myofibril.
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Myosin filaments iterdigitate with actin filaments in order to bring about muscle contraction. Provide below the 5 steps that are required for Myosin to move along actin.
Draw a graph of the isometric force–length relationshipof striated muscle, indicating where maximal overlap betweenactin and myosin filaments occurs.
Label the molecular components of the myofilaments from a close up view of a model of a relaxed sarcomere
Chapter 6 Solutions
EBK HUMAN BIOLOGY
Ch. 6 - In a general sense, how do skeletal muscles...Ch. 6 - In the diagram below, label the fine structure of...Ch. 6 - How do actin and myosin interact in a sarcomere to...Ch. 6 - How does a muscle fiber incur an oxygen debt?Ch. 6 - What is the function of the sarcoplasmic reticulum...Ch. 6 - Explain why (a) calcium ions and (b) ACh are vital...Ch. 6 - What is a motor unit? Why does a rapid series of...Ch. 6 - What are the structural and functional differences...Ch. 6 - Prob. 1SQCh. 6 - Prob. 2SQ
Ch. 6 - Prob. 3SQCh. 6 - The _____ is the basic unit of muscle contraction....Ch. 6 - Skeletal muscle contraction requires _________. a....Ch. 6 - Nerve impulses first stimulate a skeletal muscle...Ch. 6 - Prob. 7SQCh. 6 - Prob. 8SQCh. 6 - Prob. 9SQCh. 6 - Prob. 10SQCh. 6 - You are training athletes for the 100-meter dash....Ch. 6 - Prob. 2CTCh. 6 - Prob. 3CTCh. 6 - At the gym Sean gets on a stair-climbing machine...
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- Figure 38.37 Which of the following statements about muscle contraction is true? The power stroke occurs when ATP is hydrolyzed to ADP and phosphate. The power stroke occurs when ADP and phosphate dissociate from the myosin head. The power stroke occurs when ADP and phosphate dissociate from the actin active site. The power stroke occurs when Ca2+ binds the calcium head.arrow_forwardWhat is the function of the sarcoplasmic reticulum in muscle cell contraction?arrow_forwardThe _____ is the basic unit of muscle contraction. a. myofibril b. sarcomere c. muscle fiber d. myosin filamentarrow_forward
- Explain how the filaments of a myofibril interact during muscle contraction.arrow_forwardDescribe the three steps (in detail) and the regions where these steps occur required for a skeletal muscle contraction to occur. Diagram(s) is (are) encouraged.arrow_forwardLabel the molecular components of the myofilaments from a close up view of a model of a relaxed sarcomerearrow_forward
- Describe the structural relationships among the following in aresting skeletal muscle fiber: A band, H zone, M line.arrow_forwardWhat trend do you notice between force generation capability of a muscle and its cross-sectional area? If a muscle has a large cross-sectional area, then its force-producing potential is?arrow_forwardUsing the sliding filament theory of contraction, explain why the contraction strength of a muscle is maximal at a particular muscle length.arrow_forward
- The sliding filament model of contraction is a theory that is used to explain how muscles contract to cause movement. The theory explains that the change in the length of the muscle during contraction is due to the sliding of the myofilaments past each other and not to a change in the length of either of the myofilaments.arrow_forwardDescribe the following regions/structures of a sarcomere. (Fig 12.5) A band - striated patterns of light and dark muscle fibers; scatters light unevenly; uses the entire length of thick filaments; the center of the band uses only thick filaments H zone I band M line Z discarrow_forwardDescribe how thick and thin filaments interact during a musclecontractionarrow_forward
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