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| 51. | I step up the breathing rate--timing the contraction and relaxation of chest muscles. |
| 我增加呼吸率--调节胸部肌肉的收缩和舒张的速率。 |
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| 52. | a protein complex in muscle fibers; composed of myosin and actin; shortens when stimulated and causes muscle contractions. |
| 肌肉纤维的蛋白联合体，由球蛋白和肌动朊构成，受刺激变短，从而造成肌肉收缩。 |
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| 53. | A protein found in muscle that together with myosin functions in muscle contraction. |
| 肌动朊一种在肌肉中发现的，伴随肌肉收缩中肌浆球蛋白运动的蛋白质 |
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| 54. | Additionally, high progesterone levels inhibit the ability of the muscles in the wall of the uterus to contract. |
| 再者，高黄体酮含量能抑制子宫壁肌肉的收缩能力。 |
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| 55. | Transmembrane signal transmission functions of cell; The mechanics of muscle contraction. |
| 【了解】细胞的跨膜信号转导功能；肌肉收缩的力学关系。 |
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| 56. | An abnormality in neuromuscular activity characterized by rapidly alternating muscular contraction and relaxation. |
| 抽筋痉挛，阵挛神经肌肉活动的不正常状态，特征是快速交替的肌肉收缩和放松 |
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| 57. | Muscle contractions are powered by the chemical adenosine triphosphate(ATP ). |
| 肌肉收缩是由化学物质三磷酸腺苷（ATP）提供动力的。 |
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| 58. | "At orgasm the muscle tension is quickly released; the penis contracts repeatedly, ejaculating semen; the vagina contracts regularly." |
| 在高潮期,神经肌肉的紧张很快得到缓解;阴茎反复收缩,射出精液;阴道有规律的收缩。 |
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| 59. | This muscle was onlycontracting,which means a signal from thebrain was not getting through. |
| 这块肌肉只是收缩 说明有一个大脑信号没有传送到 |
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| 60. | The view that phosphocreatine was the direct source of energy for muscular contraction lasted only a few years. |
| 认为磷酸肌酸作为肌肉收缩直接能源的观点，流行了不过数年。 |
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