求翻译：在肌肉张力升高或长度缩减的过程中，肌肉收缩按肌肉是否缩短收缩可分两种情况：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？

正在翻译，请等待...

Increase in muscle tension or the length contraction in the muscles, the muscles for reduced shrinkage can be divided into two cases: 1, and a contraction, muscle length changes, and tension is not constant; 2 long contraction, the length and tension of the contraction changes. A muscle contraction,

Reduce in the muscle tensity ascension or the length in process, contracture of muscle according to muscle whether reduces the contraction to be possible to divide two kind of situations:①The isotonia contraction, the muscle length changes, but the tensity is invariable;②But and so on the long contr

Increased muscle tension or reduced in length, muscle contraction muscle contraction can be divided into two kinds: ① isotonic contraction, the muscle length changes, tension constant; ② isometric contraction, changes in the length and tension of the contraction. When muscle contraction, length shor

正在翻译，请等待...