[ANIMAL PHYSIOLOGY] When an action potential from a motor neuron arrives at the neuromuscular junction, a series of events occurs that leads to muscle contraction. Arrange following events in the correct order from first to last. 1) Action potential conduction down the T-tubules 2) Conformational change in troponin 3) Depolarization of the muscle cell 4) Release of Ca2+ from the sarcoplasmic reticulum 5) Acetylcholine release Select one: Оа. 33B 5%;B 13 2; 4 O b. 1; 3; 4; 5; 2 О с. 5;B 43 3;B 13B 2 O d. 5; 3; 1; 4; 2 O e 5: 1: 4: 3: 2

[ANIMAL PHYSIOLOGY] When an action potential from a motor neuron arrives at the neuromuscular junction, a series of events occurs that leads to muscle contraction. Arrange following events in the correct order from first to last. 1) Action potential conduction down the T-tubules 2) Conformational change in troponin 3) Depolarization of the muscle cell 4) Release of Ca2+ from the sarcoplasmic reticulum 5) Acetylcholine release Select one: Оа. 33B 5%;B 13 2; 4 O b. 1; 3; 4; 5; 2 О с. 5;B 43 3;B 13B 2 O d. 5; 3; 1; 4; 2 O e 5: 1: 4: 3: 2

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter8: Muscle Physiology

Section: Chapter Questions

Problem 12RE

See similar textbooks

Similar questions

Watch this video (http://openstaxcollege.org/l/micromacro) to learn more about macro- and microstructures of skeletal muscles. (a) What are the names of the junction points between sarcomeres? (b) What are the names of the subunits within the myofibrils that run the length of skeletal muscle fibers? (c) What is the â€œdouble strand of pearlsâ€� described in the video? (d) What gives a skeletal muscle fiber its striated appearance?
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.
Which of the following step(s) about the excitation of skeletal muscle is/are incorrect? 1. Acetylcholine is released and binds to motor end plate receptors 2. An action potential is created and moves down T-tubules 3. Calcium is released from the sarcoplasmic reticulum 4. Calcium ions bind to tropomyosin to shift troponin off the binding sites for cross-bridging 5. Myosin forms cross-bridges and binds with actin to pull it towards middle of sarcomere
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 contraction occur in which sequence? "attach to actin, detach from actin, pivot in powerstroke, return or recock" "attach to actin, pivot in powerstroke, detach from actin, return or recock" "attach to actin, pivot in powerstroke, return or recock, detach from actin" "detach from actin,pivot in powerstroke, attach to actin, return or recock" What is the role of calcium pump in muscle contractions? pump calcium out of the sarcoplasmic reticulum against its concentration gradient to initiate contractions remove calcium from the fluid surrounding the myofibrils to end contractions pump calcium into the muscle cell to stimulate the release of acetylcholine
What event causes a troponin-tropomyosin complex to regain its original shape in muscle relaxation? a. stimulation of ACh receptors b. diffusion of Na+ back into transverse tubules c. return of Ca2+ into the sarcoplasmic reticulum d. breaking of the bond with tropomyosin
While the sarcoplasmic reticulum of muscle was first described by nineteenth-century microscopists, its true significance was not ap-preciated until its intricate structure was revealed much later by the electron microscope. What could you tell a nineteenth-century microscopist to enlighten him or her about the structure of the sarcoplasmic reticulum and its role in the coupling of excitation and contraction?
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
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
Skeletal muscle cells undergo contractions based on a molecular mechanism involving: 1)the sliding of actin and myosin filaments past each other without any change in filament length 2) the shortening of actin filaments following direct interaction with myosin 3) dynamic instability of microtubules 4)none
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 head
The single-fiber twitch experiments shown here were generated by stimulating the muscle cell membranes to threshold with an electrode and measuring the resulting action potential and force. How would the results differ if Ca21 were removed from the extracellular solution just before the electrical stimulus was applied?
Which of the following statements best describes the sliding filament mechanism of muscle contraction? a. Actin and myosin filaments do not shorten, but rather, slide past each other. b. Actin and myosin filaments shorten and slide past each other. c. As they slide past each other, actin filaments shorten, but myosin filaments do not shorten. d. As they slide past each other, myosin filaments shorten, but actin filaments do not shorten.