In rigor mortis A) the myosin heads room attached come actin. B) cross-bridge cycle is absent. C) muscles room inextensible (unable come be extended out). D) ATP is depleted. E) all of the above
Active website on the actin become accessible for binding after ~ A) myosin binding to troponin. B) calcium binding to troponin. C) actin binding to troponin. D) troponin binding to tropomyosin. E) calcium binds to tropomyosin.

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Which that the adhering to would cause your muscle to do an isometric contraction? A) bicep curls B) wall surface sit C) squats D) a 1 mile run E) Both B and D.
Interactions between actin and also myosin filaments that the sarcomere space responsible for A) the striped illustration of skeletal muscle. B) muscle fatigue. C) muscle contraction. D) the conduction of neural stimulation come the muscle fiber. E) muscle relaxation.
Which the the adhering to become connected by myosin cross-bridges during muscle contraction? A) z disks and also actin filaments B) slim filaments and thick filaments C) thick filaments and also titin filaments D) thin filaments and t-tubules E) special filaments and also t-tubules
The bundle the collagen fibers at the finish of a skeleton muscle the attaches the muscle come bone is dubbed a(n) A) ligament. B) myofibril. C) epimysium. D) fascicle. E) tendon. 1
At rest, energetic sites ~ above the actin room blocked by A) titin molecules. B) ATP molecules. C) calcium ions. D) myosin molecules. E) tropomyosin molecules.
The repeating unit the a skeleton muscle fiber is the A) sarcolemma. B) sarcoplasmic reticulum. C) myofibril. D) sarcomere. E) myofilament.
The cytoplasm the muscle fibers is referred to as the A) sarcolemma. B) sarcosome. C) sarcomere. D) sarcoplasm. E) sarcoplasmic reticulum.
Which the the adhering to is greater? A) the concentration that calcium ion in the sarcoplasm the a relaxing muscle B) the concentration that calcium ion in the sarcoplasm that a contracting muscle
Which that the following finest describes the ax sarcomere? A) storage site for calcium ion B) slim filaments space anchored right here C) repeating unit of myofibrils D) mainly made the myosin molecules E) protein the accounts because that elasticity of resting muscle
When calcium ion binding to the thin filament in a sarcomere, A) myosin shortens. B) tropomyosin move to expose energetic sites. C) actin heads will certainly bind come myosin. D) energetic sites top top the myosin space exposed. E) muscle relaxation occurs.
The contraction of a muscle exerts a pull on a bone due to the fact that A) muscles room attached come bones by ligaments. B) muscles room attached to bones through joints. C) muscles room attached to bones by tendons. D) A or C E) A, B, or C 2
Since each myofibril is attached at either finish of the muscle fiber, when sarcomeres shorten, the muscle fiber A) weakens. B) shortens. C) strengthens. D) lengthens. E) not sufficient information come say
When a bones muscle fiber contracts, A) the Z lines obtain closer together. B) the Z lines get more apart. C) actin moves away from the M line. D) myosin is pulled toward the M line. E) B, C, and also D.
After death, muscle fibers operation out the ATP. This results in a condition known as A) depolarization. B) tetany. C) oxygen debt. D) rigor mortis. E) treppe.

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The procedure cross-bridging, which wake up at an active site, involves a series of sequential-cyclic reactions that include A) attach, detach, pivot, return B) attach, pivot, detach, return C) attach, return, pivot, detach D) attach, return, detach, pivot
The detachment of the myosin top from actin is straight triggered by A) ATP it is registered to the myosin head B) ATP being released through the actin C) calcium attaching to actin D) calcium diffusing back into the SR
Muscles are organized in a an accurate way. Which of the following defines muscle company from largest to smallest? A) fiber, myofibril, sarcomere B) myofibril, sarcomere, fiber C) myofibril, fiber, sarcomere D) fiber, sarcomere, myofibril
Which that the adhering to are discovered in the structure labeled "3"? A) actin B) myosin C) tropomyosin D) titin E) all of the above
BONUS: In response to activity potentials (nerve signals) showing up along the muscle fiber, the sarcoplasmic reticulum releases A) potassium ions. B) calcium ions. C) salt ions. D) acetylcholine. E) hydrogen ions.
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Loose Leaf version for Hole"s Essentials of person Anatomy and Physiology11th EditionDavid N. Shier, Jackie L. Butler, Ricki Lewis
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