Which of the following is true concerning the role of Calcium in the contraction of muscle- cells? A. skeletal muscle cells require a burst of calcium from the sarcoplasmic reticulum. B. smooth muscle cells require a burst of calcium from the sarcoplasmic reticulum. C. cardiac muscle cells require a burst of calcium from the sarcoplasmic reticulum. D. All of the above are correct.

Which of the following is true concerning the role of Calcium in the contraction of muscle- cells? A. skeletal muscle cells require a burst of calcium from the sarcoplasmic reticulum. B. smooth muscle cells require a burst of calcium from the sarcoplasmic reticulum. C. cardiac muscle cells require a burst of calcium from the sarcoplasmic reticulum. D. All of the above are correct.

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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The action potential of skeletal muscle A. is not essential for contraction. B. is longer than the action potential of cardiac muscle. C. has a prolonged plateau phase. D. causes the immediate uptake of calcium ions into the lateral sacs of the sarcoplasmic reticulum. E. spreads inward to all parts of the muscle via the T tubules.
The purpose of transverse tubules is to Select one: a. ensure a supply of glycogen throughout the muscle sarcoplasm b. conduct ATP molecules out of the mitochondria throughout the sarcoplasm c. ensure a supply of calcium ions through the muscle fibre d. rapidly conduct action potentials to the interior of the muscle fibre e. all of the other statements are correct
When ADP and Pi are bound to myosin in the cross-bridge cycle... (MULTIPLE SELECT) A. There is no force production and myosin is not bound to actin B. There is no force production and myosin is bound to actin C. There is force production and myosin is not bound to actin D. If its smooth muscle, a second phosphate might be bound to the light chain E. The cross-bridge is in a state of rigor mortis F. There is force production and myosin is bound to actin
During muscle contraction, binding sites for myosin are uncovered by the movement of A. Tropomysin B. Actin myofilaments C. ADP D. Troponin
Which is not a protein found in thin filaments? a. Tropomyosin b. Actin c. Troponin d. Myosin e. No exceptions; all are found in thin filaments.
Which of the following correctly lists the structures that make up a motor unit? a. motor neuron plus some of the muscle fibers it innervates b. motor neuron plus all of the muscle fibers it innervates c. motor neuron plus one of the muscle fibers it innervates d. all of the above e. none of the above
Which statement about the diagram is not correct?? A. The diagram enlarged one myofibril B. This diagram only shows part of one muscle fiber C. The yellow tubular things are extensions of the plasma membrane D. In the most magnified diagram, the small purple dots are mitochondria E. The light blue stuff with the holes, like swiss cheese, are where calcium ions are stored
As ADP and Ⓟ are released from a myosin head,a. actin filaments move toward the H band.b. a sarcomere shortens.c. myosin filaments pull toward the thin filaments.d. All of these are correct.
When animals die, the muscles stiffen in rigor mortis because…
When comparing cardiac muscle cells and skeletal muscle cells, Select one: a. only skeletal muscle has a plateau phase in its contraction cycle. b. both possess intercalated discs. c. action potentials are conducted from cell to cell only in cardiac muscle. d. both are voluntary. e. the rate of action potential propagation is faster in cardiac muscle.
17. Which of the following properties of the structure of skeletal muscle is not true? A. Comprised of individual cells. B. Have well defined striations. C. Have T-tubules. D. Communicate electrically through gap junction channels (connexins). E. Have well defined sarcomeric structure and extensive sarcoplasmic reticulum.
24. Which of the following is true concerning the role of Calcium in the contraction of muscle- cells? A. Smooth muscle cells contract in response to an extracellular inward-Calcium-current. B. Skeletal muscle cells contract in response to an extracellular inward-Calcium-current. C. Striated muscle cells contract in response to an extracellular inward-Calcium-current. D. No type of muscle cell requires an extracellular inward-Calcium current for normal C. contractile-function. D. Isotonic : Isometric