Which of the following is true concerning the role of Calcium in the contraction of muscle- cells? 23. A. skeletal muscle cells require an extracellular inward-Calcium-current to stimulate the burst of Calcium from the sarcoplasmic reticulum. B. smooth muscle cells require an extracellular inward-Calcium-current to stimulate the burst of Calcium from the sarcoplasmic reticulum. C. cardiac muscle cells require an extracellular inward-Calcium-current to stimulate the burst of Calcium from intracellular stored-Calcium-organelles. D. No type of muscle cell requires an extracellular inward-Calcium current for normal D. contractile-function.

Which of the following is true concerning the role of Calcium in the contraction of muscle- cells? 23. A. skeletal muscle cells require an extracellular inward-Calcium-current to stimulate the burst of Calcium from the sarcoplasmic reticulum. B. smooth muscle cells require an extracellular inward-Calcium-current to stimulate the burst of Calcium from the sarcoplasmic reticulum. C. cardiac muscle cells require an extracellular inward-Calcium-current to stimulate the burst of Calcium from intracellular stored-Calcium-organelles. D. No type of muscle cell requires an extracellular inward-Calcium current for normal D. contractile-function.

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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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
which of the following statement is true? a. Fast fibers have difficulty fatiguing b. Fast fibers have large glycogen reserves c. Fast fibers containe loosely packed myofibrils d. Fast fibers have a small diameter
27- The calcium ions those are needed for muscle contraction are stored in: A. Transverse tubules C.Sacrolemma B. Sacroplasmic reticulum D. Sacromere
Crossbridges that form during muscle contraction are a bond between: A. Myoglobin and Troponin B. Hemoglobin and Glycogen C. Actin and Myosin D. Toponin and Tropomyosin
When a muscle fiber is stretched from 60% of its optimal length to Lo, what change or changes are happening on the cellular level (MULTIPLE SELECT)? A. Increased calcium release from the SR B. Increased firing of action potentials from the alpha motor neuron C. Increased rate of myosin ATPase activity D. Increased number of actin-myosin bridges E. Increased stretch on titin, producing more passive force
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Which statement about striated skeletal muscle is true? A. The tension generated by a muscle is invariable. B. Mechanical summation of twitches in a muscle fiber leads to a graded increase in the tension that is above that generated by a single twitch. C. A single action potential arriving at the neuromuscular junction is not sufficient to cause a muscle fiber to twitch. D. Muscle twitches are able to mechanically sum when Ca2+ is quickly and completely removed from the sarcoplasm between action potentials. E. An action potential in the muscle cell activates contraction by releasing Na+ into the sarcoplasm.
35. Which of the following sentences is CORRECT? A. Intercalated disc is absent in smooth muscle and skeletal muscle B. The contraction of smooth muscle cells is slow, but they can remain contracted for long periods C. Cerebellar cortex is composed of outer molecular layer, central layer of Purkinje cells, and granule layer D. Ganglia are ovoid structures containing neuronal cell bodies and glial cells supported by connective tissue
Considering the Types of Skeletal Muscle Fibers, people that are naturally strong weight-Lifters are probably born with a higher percentage of Whereas a person that is naturally good at long-distance running, would probably be born with a higher percentage of, 31. olim A. Fast-twitch/white fibers : Slow-twitch/dark or red fibers B. Slow-twitch/dark or red fibers : Fast-twitch/white fibers C. Intermediate/green fibers : Tertiary Intermediate/purple fibers D. Tertiary Intermediate/purple fibers : Intermediate/green fibers 36 Seonbed is:
Put the following items in order of decreasing size: 63. Sección Largest 64. 65. 66. 67. Smallest A. Calcium В. Мyofibril C. Myofilament D. Sarcomere E. Tropomyosin