EBK BIOLOGY
6th Edition
ISBN: 8220106777640
Author: 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
ATP needs to be present for muscle relaxation
A neurotransmitter is released at the neuromuscular junction
ATP needs to be present for muscle contraction
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
the thick filaments shorten
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
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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_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_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_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_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_forwardWhich of the following does not occur during the excitation contraction coupling of skeletal muscle? Opening of ryanodine receptor calcium channels Calcium binding to troponin Tropomyosin shifting away from myosin binding sites on the actin An end plate potentialarrow_forward
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