Anatomy & Physiology
1st Edition
ISBN: 9781938168130
Author: Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble
Publisher: OpenStax College
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Textbook Question
Chapter 10, Problem 13RQ
During muscle contraction, the cross-bridge detaches when ________.
- the myosin head binds to an xADP molecule
- the myosin head binds to an ATP molecule
- calcium ions bind to troponin
- calcium ions bind to actin
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Skeletal muscle cells have the ability to do all of the following EXCEPT _____.
activating other muscle cells to contract
producing force while shortening
responding to chemicals released by nerve cells
rebounding to their former length after being stretched
The depletion of ATP in muscle cells causes ____.
myosin heads to remain bound to actin
calcium ions to be released from the sarcoplasmic reticulum
myosin-binding sites on actin to be blocked again by tropomyosin.
ligand-gated sodium channels to close again
//
_can fit between actin filaments that have ______ crosslinkers, converting them to
bundles
Myosin II, long, contractile
Myosin I, long, contractile
Myosin I, short, non-contractile
O Myosin II, short, non-contractile
Chapter 10 Solutions
Anatomy & Physiology
Ch. 10 - Watch this video...Ch. 10 - Every skeletal muscle fiber is supplied by a motor...Ch. 10 - The release of calcium ions initiates muscle...Ch. 10 - Muscle that has a striped appearance is described...Ch. 10 - Which element is important in directly Triggering...Ch. 10 - Which of the following properties is not common to...Ch. 10 - The correct order for the smallest to the largest...Ch. 10 - Depolarization of the sarcolemma means ________....Ch. 10 - In relaxed muscle, the myosin-binding site on...Ch. 10 - According to the sliding filament model, binding...
Ch. 10 - The cell membrane of a muscle fiber is called...Ch. 10 - Muscle relaxation occurs when ________. calcium...Ch. 10 - During muscle contraction, the cross-bridge...Ch. 10 - Thin and thick filaments are organized into...Ch. 10 - During which phase of a twitch in a muscle fiber...Ch. 10 - Muscle fatigue is caused by ________. buildup of...Ch. 10 - A sprinter would experience muscle fatigue sooner...Ch. 10 - What aspect of creatine phosphate allows it to...Ch. 10 - Dmg X blocks ATP regeneration from ADP and...Ch. 10 - The muscles of a professional sprinter are most...Ch. 10 - The muscles of a professional marathon runner are...Ch. 10 - Which of the following statements is true? Fast...Ch. 10 - Which of the following statements is false? Slow...Ch. 10 - Cardiac muscles differ from skeletal muscles in...Ch. 10 - If cardiac muscle cells were prevented from...Ch. 10 - Smooth muscles differ from skeletal and cardiac...Ch. 10 - Which of the following statements describes smooth...Ch. 10 - From which embryonic cell type does muscle tissue...Ch. 10 - Which cell type helps to repair injured muscle...Ch. 10 - Why is elasticity an important quality of muscle...Ch. 10 - What would happen to skeletal muscle if the...Ch. 10 - Describe how tendons facilitate body movement.Ch. 10 - What are the five primary functions of skeletal...Ch. 10 - What are the opposite roles of voltage-gated...Ch. 10 - How would muscle contractions be affected if...Ch. 10 - What causes the striated appearance of skeletal...Ch. 10 - How would muscle contractions be affected if ATP...Ch. 10 - Why does a motor unit of the eye have few muscle...Ch. 10 - What factors contribute to the amount of tension...Ch. 10 - Why do muscle cells use creatine phosphate instead...Ch. 10 - Is aerobic respiration more or less efficient than...Ch. 10 - What changes occur at the cellular level in...Ch. 10 - What changes occur at the cellular level in...Ch. 10 - What would be the drawback of cardiac contractions...Ch. 10 - How are cardiac muscle cells similar to and...Ch. 10 - Why can smooth muscles conn act over a wider range...Ch. 10 - Describe the differences between single-unit...Ch. 10 - Why is muscle that has sustained significant...Ch. 10 - Which muscle type(s) (skeletal, smooth, or...
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- The _____ is the basic unit of muscle contraction. a. myofibril b. sarcomere c. muscle fiber d. myosin filamentarrow_forwardSkeletal muscle contraction requires _________. a. calcium ions b. ATP c. arrival of a nerve impulse d. all of the abovearrow_forwardAfter death, a person no longer makes ATP, so calcium stored in the sarcoplasmic reticulum diffuses down its concentration gradient into the muscle cytoplasm. This result is rigor mortis----an unbreakable state of muscle contraction that stiffens the body for a few days until muscles begin to decay. Explain why this contraction occurs.arrow_forward
- The mechanism of contraction in smooth muscle is different from skeletal muscle in that the site of calcium binding differs ATP energizes the sliding process actin and myosin interact by the sliding filament mechanism the trigger for contraction is a rise in intracellular calcium the thick filaments have fewer myosin headsarrow_forwardMatch the statement on the left with the best response on the right. Breaking the high energy bond in ATP Causes troponin/tropomyosin proteins to move and expose the myosin binding sites on actin The place where acetylcholine contributes to muscle contraction [Choose ] [Choose ] causes myosin to perform the power stroke and produce force phosphate causes myosin to let go of actin calcium neuromuscualr junction sarcomerearrow_forwardArrange the steps of muscle contraction in the correct orderarrow_forward
- Why does a skeletal muscle cell generate the same amount of tension with each single stimulus? O Same amount of calcium is released with each stimulus Motor units are the same size in all muscle OMuscle cells are all the same length Calcium pumpms use the same amount of ATParrow_forwardAfter the myosin ATPase hydrolyzes ATP into ADP + Pi, ________. the two products stay attached to the myosin head the myosin head contacts the troponin the myosin head has nothing bound, and is ready for the power strokearrow_forwardDuring sarcomere shortening myosin gets shorter actin gets shorter A-band gets shorter • H-zone gets shorter more than one of the above is correctarrow_forward
- Tetanus is a phenomenon where muscle fibers are continuously contracted. What best explains this? Large action potentials on the sarcolemma Increase in acetylcholinesterase increase in the lag phase Increase in calcium pump activity Calcium remains elevated in the sarcoplasmarrow_forwardWhy does continuous calcium release within a muscle fiber cause greater tension? OActivates more calcium pumps O Activates myofibrils continuously Increases action potential frequency Lengthens sarcomere O Calcium makes the muscle fiber an offer it can't refusearrow_forwardThe calcium binding protein in muscle is called: Actin O Troponin C Tropomyosin O Myosinarrow_forward
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