Laboratory Manual For Human Anatomy & Physiology
4th Edition
ISBN: 9781260159363
Author: Martin, Terry R., Prentice-craver, Cynthia
Publisher: McGraw-Hill Publishing Co.
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Chapter 20, Problem F20.7A
FIGURE 20.7 Label this transmission electron micrograph
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During maximal contraction of a sarcomere the H band is still visible.
The image below shows a sarcomere. Which region of sarcomere does each letter represent?
The mechanism of muscle contraction is best explained by the sliding filament model. According to this model, thin ___i___ filaments slide over thick ___ii___ filaments.The statement given above is completed by information in row
Row
i
ii
A.
myosin
actin
B.
myosin
myosin
C.
actin
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actin
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Chapter 20 Solutions
Laboratory Manual For Human Anatomy & Physiology
Ch. 20 - The outermost layer of connective tissue of a...Ch. 20 - The thick myofibril filament of a sarcomere is...Ch. 20 - The muscle primarily responsible for an action is...Ch. 20 - The neuron and the muscle fibers it innervates is...Ch. 20 - The functional contractile unit of a muscle fiber...Ch. 20 - Prob. 6PLCh. 20 - A synergistic muscle contraction assists the...Ch. 20 - The plasma membrane of a muscle fiber (cell) is...Ch. 20 - Match the terms in column A with the definitions...Ch. 20 - FIGURE 20.7 Label this transmission electron...
Ch. 20 - When stimulated to contract, the sarcomeres...Ch. 20 - Prob. 3.1ACh. 20 - The ____________ of a muscle is attached to a more...Ch. 20 - A muscle responsible for most of an action is...Ch. 20 - Assisting muscles of an agonist are called...Ch. 20 - Antagonists are muscles that resist the actions...Ch. 20 - When the forearm is extended at the elbow joint,...Ch. 20 - When the biceps brachii acts as the agonist, the...Ch. 20 - A _____________ is a synergistic muscle that will...
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- Please label E,G,H-I and state function thanksarrow_forwardwhy would skeletal muscle cell need so many nuclei?arrow_forwardWhen Skeletal muscle contracts an arrangement of the alternating light and dark bands traversing each skeletal muscle cell changes. Which of the following statements is not correct. (Select one answer) (a) The dark A bands will remain a constant length(b) The space occupied by the H zone will not change(c) The light I bands will shorten(d) The z lines come closer together(e) The I band consists solely of thin actin filamentsarrow_forward
- Figure 38.38 The deadly nerve gas Sarin irreversibly inhibits acetycholinesterase. What effect would Sarin have on muscle contraction?arrow_forwardFigure 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_forwardWhy is it logical that there are no muscle fibers classified asslow-glycolytic?arrow_forward
- Which of the following regions of a sarcomere does not change length during a contraction because it represents the length of the thick myosin filaments. Group of answer choices Z disk H band A band I bandarrow_forwardName and describe the function of the two regulatory proteins on the actin thin filament muscle.arrow_forwardDefine activa-tion loop,arrow_forward
- Define the structure of a sarcomere.arrow_forwardYou are a brilliant (but evil) biochemist who is developing a toxin that can be used to paralyze skeletal muscle. Using your knowledge of how muscle contraction happens at the cellular and molecular levels, identify two steps in the sequence of events necessary for the contraction that could be disrupted to cause paralysis, and explain why each disruption would prevent muscle contraction.arrow_forwardthe following structure will carry efferent impulses from central nervous system to skeletal muscles to make them contract: select one: a b c d e f g harrow_forward
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