Which of the following statements is FALSE regarding skeletal muscle contraction? O a. Calcium binds troponin specifically on a calcium binding site which then leads to tropomyosin movement O b. The action potential of a motor nerve is transmitted to a muscle fibre through the neuromuscular junction which is a fusion of nerve and muscle cell membranes O c. Fine motor movement/control is a result of recruiting smaller motor units O d. Calcium is pumped into storage soon after it is released to the cytoplasm

Which of the following statements is FALSE regarding skeletal muscle contraction? O a. Calcium binds troponin specifically on a calcium binding site which then leads to tropomyosin movement O b. The action potential of a motor nerve is transmitted to a muscle fibre through the neuromuscular junction which is a fusion of nerve and muscle cell membranes O c. Fine motor movement/control is a result of recruiting smaller motor units O d. Calcium is pumped into storage soon after it is released to the cytoplasm

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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Based on your understanding of skeletal muscle fiber physiology, which of the following processes is NOT dependent on the use of ATP? O recovery stroke O Na+/K+ pumps O voltage-gated Ca2+ channels O muscle fiber relaxation none of the above Next « Previous
We move a lot and do not even realize how intricate these movements may be from gross motor to fine motor manipulations. Briefly explain the steps involved in a single muscle contraction beginning at the neuromuscular junction through one complete contraction and relaxation for the sliding filament theory. Don’t forget to include all the major proteins (actin, myosin, troponin and tropomyosin) involved as well as calcium and ATP.
With regard to muscle contraction, which of the following is an INCORRECT statement with regard to the interactions of filaments that occur in the sarcomere? A. When muscles are relaxed tropomyosin blocks binding sites on actin subunits, which keeps cross-bridges from forming. B. The myosin heads conduct a power stroke motion to slide when bound to actin, to move the "thin" filaments towards the center of the sarcomere. C. During contraction, actin subunits are removed from the ends of the "thin" filaments to shorten actin polymers, thus reducing the length of the sarcomere. D. "Thick" filaments are anchored at the M-line, while "thin" filaments are anchored at the Z-line. E. Numerous myosin heads engage with the actin filaments simultaneously, such that there is no back-slipping during the contraction process.
In 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 sarcolemma
Match each description to the correct phase of a muscle twitch 73. Sección Ca2+ transported back into the sarcoplasmic reticulum 74. Sarcomeres shorten 75. Depolarization occurs in the T-Tubule 76. Muscle Tension decreases A. Latent period B. Contraction phase C. Relaxation phase
A. nerve cell releases neurotransmitter which stimulates the muscle cell: B. calcium is released from sarcoplasmic reticulum and floods sarcoplasm; C. sarcolemma is permeable to sodium allowing sodium to rush into cell; D. myosin forms cross-bridges to pull actin into the center of the sarcomere; E. sarcolemma depolarizes and conducts an action potential Put them in order
44.
How is the list below to be properly put in order to describe a muscular contraction? 1. Calcium causes exocytotic release of Acetylcholine into the synaptic gap; all this happens at an area called the neuromuscular junction2. ATP is consumed which allows myosin to "pivot" the myosin head, which pulls actin toward it.3. This process is repeated multiple times and is called the "sliding filament theory".4. Myosin filaments perform "crossbridging".5. Calcium is released and circulated throughout the muscle cell6. The brain predicts the action necessary and decides which muscles and how many "motor units" are needed to perform that action.7. Tropomyosin moves to reveal the active site of the F-Actin strand8. Upon reception of a calcium ion, the Troponin complex becomes activated9. Proteins embedded in the Sarcolemma receive enough of the ACH neurotransmitter to generate an electrical impulse.10. The electrical impulse is perpetuated throughout the muscle fiber.11. A nervouse impulse is…
The factor(s) that determine the duration of a twitch in various types of fibers is the speed of the a. movement of Na+ across their membranes only. b. removal of Ca2+ ions from the sarcoplasm and hydrolysis of ATP. c. removal of Ca2+ ions from the sarcoplasm only. d. removal of Ca2+ ions from the sarcoplasm and hydrolysis of ATP and movement of Na+ across their membranes. e. hydrolysis of ATP only.
Which of the following would NOT occur as a result of regular exercise to a specific muscle group (assume you are resting now, but have been working this muscle group)? more capillaries will grow into the area the muscle cells will build more mitochondria O the muscle cells will build fewer contractile proteins O the muscle cells will increase their glycogen stores
What causes relaxation in a skeletal muscle fiber Select one: a. Myosin remains attached to actin b. Calcium is pumped away from myofibrils c. Voltage gated potassium channels open d. Voltage gated sodium channels inactivate
A new experimental drug is tested in muscle fibers and it is concluded that it blocks the calcium channels in the sarcoplasmic reticulum. Which of the following are expected consequences of the injection of this drug in skeletal muscles?