求翻译：根据肌肉张力升高或长度缩减的过程，肌肉收缩可分为两种类型按肌肉是否缩短收缩：①等张收缩,肌肉长度发生变化,而张力不变；②等长收缩，长度不变而张力发生变化的收缩。肌肉做等张收缩时，长度缩短,可产生有用的功,如用手提起重物。肌肉做等长收缩时，其长度不变，故无功可言，但可产生一定的张力，如人手持重物水平移动时，肱二头肌所处等长收缩状态。肌肉的张力是一种位能形式的机械能,在一定条件下,可转化为动能形式的机械功。肌肉的功能主要是消耗自由能以产生机械力。同时，肌肉收缩所产生的热量，对温血动物维持恒定体温及变温动物提高体温，有重要作用。是什么意思？

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According to muscle tension increases or the length of the process, reduce muscle contractions can be divided into two types based on whether they reduce muscle contraction: a contraction of 1 length, muscle tension, and a change does not change; 2 long contraction, length and tension of the contrac

The process reduce which according to the muscle tensity ascension or the length, the contracture of muscle may divide into two kind of types according to the muscle whether reduces the contraction:①The isotonia contraction, the muscle length changes, but the tensity is invariable;②But and so on the

According to the increased muscle tension or length reduction process, can be divided into two types of muscle contraction by muscle shortening contraction: ① isotonic contraction, the muscle length changes, tension constant; ② isometric contraction, changes in the length and tension of the contract

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