• Explain what is happening here in muscle contraction. Be sure to tell mewhat role Ca+, ATP, myosin, and actin play.Thin filaments(Binding of a new mol-ecule of ATP releases themyosin head from actin,and a new cycle begins.Thick filamentThin filament movestoward center of sarcomere.1962-BITTIGEMyosin head (low-energy configuration)ADP+Releasing ADP and P, myosinreturns to its low-energy configuration,sliding the thin filament.frith-atte2Starting here, the myosin headis bound to ATP and is in itslow-energy configuration,$394333322 Thin filament-Myosin head (low-energy configuration)Cross-bridgeThickfilamentActin2 The myosin head hydrolyzesATP to ADP and inorganicphosphate () and is in itshigh-energy configuration.aMyosinMyosinbinding sites1-Myosin head (high-energy configuration)The myosin head bindsto actin, forming across-bridge.

There are three types of muscles present in our body, namely skeletal muscle, smooth muscle and…

• Explain what is happening here in muscle contraction. Be sure to tell me what role Ca+, ATP, myosin, and actin play. Binding of a new mol- ecule of ATP releases the myosin head from actin and a new cycle begins Thick filament T Thin filament moves toward center of sarcomere Myosin head dow energy configuration) Releasing ADP and myosin returns to its low-energy configuration, sliding the thin filament Starting here, the myosin head is bound to ATP and is in its low-energy configuration -Myosin head dow energy configuration) Cross-bridge Thick Actin The myosin head hydrolyzes ATP to ADP and inorganic phosphate () and is in its high-energy configuration Myosin binding sites Myosin head thigh- energy configuration) The myosin head binds to actin, forming a cross-bridge

• Explain what is happening here in muscle contraction. Be sure to tell me what role Ca+, ATP, myosin, and actin play. Binding of a new mol- ecule of ATP releases the myosin head from actin and a new cycle begins Thick filament T Thin filament moves toward center of sarcomere Myosin head dow energy configuration) Releasing ADP and myosin returns to its low-energy configuration, sliding the thin filament Starting here, the myosin head is bound to ATP and is in its low-energy configuration -Myosin head dow energy configuration) Cross-bridge Thick Actin The myosin head hydrolyzes ATP to ADP and inorganic phosphate () and is in its high-energy configuration Myosin binding sites Myosin head thigh- energy configuration) The myosin head binds to actin, forming a cross-bridge

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter43: Muscles, Bones, And Body Movements

Section: Chapter Questions

Problem 3TYK

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Similar questions

Figure 38.37 Which of the following statements about muscle contraction is true? The power stroke occurs when ATP is hydrolyzed to ADP and phosphate. The power stroke occurs when ADP and phosphate dissociate from the myosin head. The power stroke occurs when ADP and phosphate dissociate from the actin active site. The power stroke occurs when Ca2+ binds the calcium head.
The release of calcium ions initiates muscle contractions. Watch this video (http://openstaxcollege.org/l/calciumrole) to learn more about the role of calcium. (a) What are â€œT-tubulesâ€� and what is their role? (b) Please also describe how actin-binding sites are made available for cross-bridging with myosin heads during contraction.
After death, calcium pumps no longer function and the calcium ion concentration of muscle fiber cytoplasm increases. The result is rigor mortis a state or postmortem muscle contraction. Explain why this contraction occurs and why it ends only when myosin heads begin to break down.
After death, a person no longer makes ATP, so calcium stored in the sarcoplasmic reticulum diffuses down its concentration gradient into the muscle cytoplasm. This result is rigor mortis----an unbreakable state of muscle contraction that stiffens the body for a few days until muscles begin to decay. Explain why this contraction occurs.
Every skeletal muscle fiber is supplied by a motor neuron at the NMJ. Watch this video (http://openstaxcollege.org/l/skelmuscfiber) to learn more about what happens at the neuromuscular junction. (a) What is the definition of a motor unit? (b) What is the structural and functional difference between a large motor unit and a small motor unit? Can you give an example of each? (c) Why is the neurotransmitter acetylcholine degraded after binding to its receptor?
The _____ is the basic unit of muscle contraction. a. myofibril b. sarcomere c. muscle fiber d. myosin filament
In the diagram below, label the fine structure of a muscle, down to one of its myofibrils. Identify the basic unit of contraction in a myofibril.
Nerve impulses first stimulate a skeletal muscle fiber at _______. a. T tubules b. sarcomeres c. neuromuscular junctions d. actin binding sites
The cell membrane of a muscle fiber is called ________. myofibril sarcolemma sarcoplasm myofilament
The muscle relaxes if no new nerve signal arrives. However the neurotransmitter from the previous stimulation is still present in the synapse The activity of helps to remove this neurotransmitter. myosin action potential tropomyosin acetylcholinesterase
Skeletal muscle contraction requires _________. a. calcium ions b. ATP c. arrival of a nerve impulse d. all of the above
Which arrangement best describes a bipennate muscle? The muscle fibers feed in on an angle to a long tendon from both sides. The muscle fibers feed in on an angle to a long tendon horn all directions. The muscle fibers feed in on an angle to a long tendon horn one side. The muscle fibers on one side of a tendon feed into it at a certain angle and muscle fibers on the other side of the tendon feed into it at the opposite angle.