Biology: Science for Life with Physiology (6th Edition) (Belk, Border & Maier, The Biology: Science for Life Series, 5th Edition)
6th Edition
ISBN: 9780134555430
Author: Colleen Belk, Virginia Borden Maier
Publisher: PEARSON
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Chapter 22, Problem 10LTB
Summary Introduction
Introduction:
Muscle can be defined as a bundle or band of fibrous tissue in an animal or human body that has the capability to contract and produce movement in or upholding the location of body parts. There are 3 types of muscle tissue: smooth, cardiac, and skeletal. All muscles are made up of a type of elastic tissue.
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Which of the following is NOT correct regarding muscle contraction?
O Ca++ in the sarcoplasm returns to the nucleus to be stored
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A neurotransmitter is released at the neuromuscular junction
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Which of the following statements regarding contraction of skeletal muscle cells is NOT true: (more than one answer may be correct)
the myofibrils shorten
the thick and thin filaments slide past one another
the thin filaments shorten
the sarcomeres shorten
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In the process of muscle contraction, which of the following steps immediately precedes the influx of sodium into a myofiber at the neuromuscular junction?
release of calcium from the terminal cisternae
sliding of tropomyosin causing exposure of actin
propagation of an action potential down the t-tubules
binding of myosin head to actin's active site
binding of acetylcholine to its receptor
Chapter 22 Solutions
Biology: Science for Life with Physiology (6th Edition) (Belk, Border & Maier, The Biology: Science for Life Series, 5th Edition)
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- In a general sense, how do skeletal muscles produce movement?arrow_forwardDepolarization of the sarcolemma means ________. the inside of the membrane has become Less negative as sodium ions accumulate the outside of the membrane has become less negative as sodium ions accumulate the inside of the membrane has become more negative as sodium ions accumulate the sarcolemma has completely lost any electrical chargearrow_forwardIn the process of muscle contraction, which of the following steps immediately comes after the propagation of an action potential down the t-tubules of a myofiber? sliding of tropomyosin causing exposure of actin binding of myosin head to actin's active site release of calcium from the terminal cisternae binding of acetylcholine to its receptor influx of sodium at the sarcolemmaarrow_forward
- In the process of muscle contraction, which of the following steps immediately precedes the sliding of tropomyosin causing exposure of actin? binding of acetylcholine to its receptor binding of calcium to troponin exocytosis of acetylcholine at NMJ binding of myosin head to actin's active site binding of ATP to the myosin headarrow_forwardWhich of the following correctly states the importance of an action potential to muscle contration? The SR will only release Ca2+ if it has been electrically stimulated. Sarcomeres require a negative electrical charge to start sliding. Actin and myosin must be electrically charged to create a cross-bridge. ATP cannot be split into ADP and Pi without an action potential.arrow_forwardIn the process of muscle contraction, which of the following steps requires hydrolysis of ATP to complete? movement of myosin head, pulling the thin filament binding of myosin head to active site on actin resetting of the myosin head back to its ready position letting go of myosin head from the active site on actin sliding of tropomyosin causing exposure of actinarrow_forward
- Which of the following statements is true regarding muscle contraction? When a muuscle contracts, the sarcomere remains the same size. When a muscle contracts, the H-zone becomes narrower (shortens). When a muscle contracts, the lighter I-band becomes wider. When a muscle contracts, the A-band shortens.arrow_forwardWhich of the following does NOT occur in or immediately prior to a muscle contraction? action potential in motor neuron acetylcholine released into synaptic cleft temporary localized changes in the membrane potential of the sarcolemma and t-tubules sacroplasmic recticulum releases acetylcholine active sites on actin molecules are exposed During contraction of a muscle, calcium ions bind to the _______." actin and myosin filaments troponin molecule tropomyosin molecule sarcoplasmic reticulum sarcolemma Which of the following is NOT a role of ionic calcium in muscle contraction? triggers neurotransmitter secretion binds with troponin removes contraction inhibitor spreads the depolarization from the neuromuscular junction to the T-tubules The role of tropomyosin in a muscle cell is to ____. all to cell to relax by blocking the binding sites on actin facilitate the formation of cross-bridges between actin and myosin Interactions between thick and thin filaments during muscle…arrow_forwardSkeletal muscle will be released in its contracted (rigor) state when: Group of answer choices ATP is hydrolyzed into forming ADP and inorganic phosphate. ATP binds to the myosin head. ADP is dissociated from the myosin head. ATP binds to the actin G-molecule.arrow_forward
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