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

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Which of the complying with would reason 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 also D.
Interactions between actin and myosin filaments of the sarcomere are responsible because that A) the striped appearance of skeleton muscle. B) muscle fatigue. C) muscle contraction. D) the conduction the neural stimulation to the muscle fiber. E) muscle relaxation.
Which the the following become associated 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 also t-tubules E) thick filaments and t-tubules
The bundle that collagen yarn at the end of a skeletal muscle the attaches the muscle come bone is called a(n) A) ligament. B) myofibril. C) epimysium. D) fascicle. E) tendon. 1
At rest, energetic sites top top 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 bones muscle fiber is the A) sarcolemma. B) sarcoplasmic reticulum. C) myofibril. D) sarcomere. E) myofilament.
The cytoplasm that muscle fibers is dubbed the A) sarcolemma. B) sarcosome. C) sarcomere. D) sarcoplasm. E) sarcoplasmic reticulum.
Which of the complying with is greater? A) the concentration of calcium ion in the sarcoplasm the a resting muscle B) the concentration of calcium ion in the sarcoplasm that a contracting muscle
Which the the following finest describes the ax sarcomere? A) storage site for calcium ions B) slim filaments are anchored here C) repeating unit the myofibrils D) mostly made of myosin molecule E) protein that accounts for elasticity of resting muscle
When calcium ion binding to the slim filament in a sarcomere, A) myosin shortens. B) tropomyosin moves to expose active sites. C) actin heads will certainly bind come myosin. D) energetic sites on the myosin space exposed. E) muscle be sure occurs.
The contraction of a muscle exerts a traction on a bone because A) muscles room attached to bones by ligaments. B) muscles room attached come 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, once sarcomeres shorten, the muscle fiber A) weakens. B) shortens. C) strengthens. D) lengthens. E) not sufficient information come say
When a skeleton muscle fiber contracts, A) the Z lines obtain closer together. B) the Z lines get additional apart. C) actin moves far from the M line. D) myosin is pulled toward the M line. E) B, C, and D.
After death, muscle fibers operation out the ATP. This outcomes in a condition known together A) depolarization. B) tetany. C) oxygen debt. D) rigor mortis. E) treppe.

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The process cross-bridging, which wake up at an active site, involves a collection of sequential-cyclic reaction that incorporate A) attach, detach, pivot, return B) attach, pivot, detach, return C) attach, return, pivot, detach D) attach, return, detach, pivot
The offhanded of the myosin heads from actin is directly triggered by A) ATP attaching to the myosin head B) ATP being released by the actin C) calcium attaching to actin D) calcium diffusing back into the SR
Muscles are organized in a specific way. Which of the following describes muscle company from largest to smallest? A) fiber, myofibril, sarcomere B) myofibril, sarcomere, fiber C) myofibril, fiber, sarcomere D) fiber, sarcomere, myofibril
Which the the following are found in the framework labeled "3"? A) actin B) myosin C) tropomyosin D) titin E) every one of the above
BONUS: In an answer to activity potentials (nerve signals) showing up along the muscle fiber, the sarcoplasmic reticulum release A) potassium ions. B) calcium ions. C) salt ions. D) acetylcholine. E) hydrogen ions.
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Loose Leaf variation for Hole"s Essentials of human Anatomy and also Physiology11th EditionDavid N. Shier, Jackie L. Butler, Ricki Lewis
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