Biology (MindTap Course List)
11th Edition
ISBN: 9781337392938
Author: Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher: Cengage Learning
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Chapter 40, Problem 4TYU
Summary Introduction
Introduction: Muscular system generates the mechanical force and motion which is necessary for locomotion. The continuous contraction and expansion of muscle filaments lead to the movement of the animal. This process is controlled mainly by a protein called troponin.
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During the contraction of a vertebrate skeletal muscle fiber,calcium ions(A) break cross-bridges as a cofactor in hydrolysis of ATP.(B) bind with troponin, changing its shape so that the myosinbinding sites on actin are exposed.(C) transmit action potentials from the motor neuron to themuscle fiber.(D) spread action potentials through the T tubules.
Outline the role of calcium ions on muscle contraction during a biceps curl. In your answer:
A) Describe the role of the nervous system in stimulating the release of calcium ions.
b) Outline the role calcium ions play in the 'sliding filament theory?'
Watch this video (http://openstaxcollege.org/l/micromacro) to learn more about macro- and microstructures of skeletal muscles. (a) What are the names of the “junction points” between sarcomeres? (b) What are the names of the “subunits” within the myofibrils that run the length of skeletal muscle fibers? (c) What is the “double strand of pearls” described in the video? (d) What gives a skeletal muscle fiber its striated appearance?
Chapter 40 Solutions
Biology (MindTap Course List)
Ch. 40.1 - Compare the functions of the epithelial coverings...Ch. 40.1 - Prob. 2LOCh. 40.1 - Prob. 1CCh. 40.1 - Prob. 2CCh. 40.1 - Prob. 3CCh. 40.1 - Prob. 4CCh. 40.2 - Compare the structure and functions of different...Ch. 40.2 - Describe the main divisions of the vertebrate...Ch. 40.2 - Prob. 5LOCh. 40.2 - Prob. 6LO
Ch. 40.2 - Prob. 1CCh. 40.2 - Prob. 2CCh. 40.2 - Prob. 3CCh. 40.2 - Prob. 4CCh. 40.3 - Prob. 7LOCh. 40.3 - Prob. 8LOCh. 40.3 - Prob. 9LOCh. 40.3 - Compare the roles of glycogen, creatine phosphate,...Ch. 40.3 - Compare the structures and functions of the three...Ch. 40.3 - Prob. 12LOCh. 40.3 - Prob. 1CCh. 40.3 - Prob. 2CCh. 40.3 - Prob. 3CCh. 40.3 - Prob. 4CCh. 40 - Prob. 1TYUCh. 40 - Prob. 2TYUCh. 40 - Test Your Understanding 3. An energy storage...Ch. 40 - Prob. 4TYUCh. 40 - Prob. 5TYUCh. 40 - Prob. 6TYUCh. 40 - Prob. 7TYUCh. 40 - Prob. 8TYUCh. 40 - Evaluate and Synthesize 9. INTERPRET DATA Examine...Ch. 40 - Prob. 10TYUCh. 40 - Prob. 11TYUCh. 40 - Prob. 12TYUCh. 40 - Prob. 13TYUCh. 40 - Prob. 14TYU
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- Watch this video (http://openstaxcollege.org/l/micromacro) to learn more about macro- and microstructures of skeletal muscles. (a) What are the names of the junction points between sarcomeres? (b) What are the names of the subunits within the myofibrils that run the length of skeletal muscle fibers? (c) What is the “double strand of pearls� described in the video? (d) What gives a skeletal muscle fiber its striated appearance?arrow_forwardThe release of calcium ions initiates muscle contractions. Watch this video (http://openstaxcollege.org/l/calciumrole) to learn more about the role of calcium. (a) What are “T-tubules� and what is their role? (b) Please also describe how actin-binding sites are made available for cross-bridging with myosin heads during contraction.arrow_forwardEvery skeletal muscle fiber is supplied by a motor neuron at the NMJ. Watch this video (http://openstaxcollege.org/l/skelmuscfiber) to learn more about what happens at the neuromuscular junction. (a) What is the definition of a motor unit? (b) What is the structural and functional difference between a large motor unit and a small motor unit? Can you give an example of each? (c) Why is the neurotransmitter acetylcholine degraded after binding to its receptor?arrow_forward
- Match the level of skeletal muscle organization given in the key with its description:Key:(a) muscle (b) fascicle (c) fiber (d) myofibril (e) myofilament__(1) rod-shaped organelle; made of sarcomeres__(2) an organ__(3) a bundle of cells__(4) a group of large molecules__(5) a cellarrow_forwardThick and thin myofilaments have different properties. For each phrase below, indicate whether the filament described is thick or thin (write thick or thin in the blanks).__(1) contains myosin heads__(2) contains actin__(3) does not lie in the H zone__(4) contains myosin__(5) attaches to a Z disc__(6) does not lie in the I bandarrow_forwardDescribe what is happening overall in the first sentence. Then describe, in detail, what is happening in each step below. Include details about what is happening at steps 5 - 7 in terms of calcium and the contraction mechanism (from a different figure). (a) -Axon terminal of somatic motor neuron Muscle fiber ACh- potential Action Na+ Action potential- -Motor end plate- lell Ca2+ released Myosin thick filament 6 + + + ++arrow_forward
- 1. What are the two types of muscle movement categories? Give an example for both. 2. Describe Swammerdam's experiment and Galvani's experiment with frog legs. What did they tell us about muscle contraction? 3. What is the sliding-filament model for muscle contraction? Describe the role of actin and myosin of sarcomeres in the model (be specific). 4. Describe how an action potential triggers muscle contraction. Know the specific molecules involved. 5. Describe the structural and functional differences between smooth, cardiac and skeletal muscles. What are the three types of skeletal muscle fibers and how do they differ in structure and function? « Previous Next MacBook Proarrow_forwardThe release of calcium ions initiates muscle contractions.Watch this video (http://openstaxcollege.org/l/calciumrole) to learn more about the role of calcium. (a)What are “T-tubules” and what is their role? (b) Pleasealso describe how actin-binding sites are made available forcross-bridging with myosin heads during contraction.arrow_forward3) Paula is a scientist who is developing a drug called Fremtol that will be used to treat muscle spasms. This drug acts on specific skeletal muscles to (1) block the release of Ca2+ ions from the sarcoplasmic reticulum, (2) inhibit the pivoting ability of the myosin heads of the thick filaments, and (3) block the production of ATP by the mitochondria in skeletal muscles. By using this drug, contraction of certain skeletal muscle fibers is reduced, which keeps those muscles from producing spasms. In the above scenario, Fremtol’s effect of blocking muscle mitochondrial ATP production would result in the inability of the muscle to make ATP from ___________. a. creatine phosphate b. anaerobic glycolysis c. aerobic respiration d. All of the above e. None of the abovearrow_forward
- 2) Paula is a scientist who is developing a drug called Fremtol that will be used to treat muscle spasms. This drug acts on specific skeletal muscles to (1) block the release of Ca2+ ions from the sarcoplasmic reticulum, (2) inhibit the pivoting ability of the myosin heads of the thick filaments, and (3) block the production of ATP by the mitochondria in skeletal muscles. By using this drug, contraction of certain skeletal muscle fibers is reduced, which keeps those muscles from producing spasms. In the above scenario, Fremtol’s effect of blocking the release of Ca2+ ions from the sarcoplasmic reticulum would most directly prevent which the following? a. activation of tropomyosin b. activation of troponin c. activation of actin d. All of the above e. None of the abovearrow_forwardCan you match the sacromere anatomy with the proper answer from the list below the table graph? Sarcomere Anatomy Description/Reaction Thin Filaments ? Thick Filaments ? A Band ? I Band ? M Line ? H Zone ? Z Disc ? A) G-Actin, F-Actin, Troponin, Tropomyosin B) Myosin C) Bisected by the M Line, this area shows only the thick filaments without any thin filamentous overlap D) The point of origin for myosin filaments found in the center of the sarcomere E) An area in the center of the sarcomere marked by the entire length of the thick filaments F) A space between sarcomeres with the z-disc in the center; this region shows Actin's anchorage points and extension without myosin overlap G) Anchoring point for the thin filamentsarrow_forwardEven though calcium is removed from troponin and tropomyosin, please describe in detail what else needs to happen to allow our muscle fibers to relax and not stay contracted?arrow_forward
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