When a skeletal muscle fiber contracts during an isotonic concentric contraction, the distance between the z bands of a sarcomere increases. true / false.

False

Explanation: as the muscles shortens due to contraction, the actin filaments from opposite ends of the sarcomere approach each other. So the two Z bands come closer with reduction in length of the sarcomere

False

Explanation:

The Z-line is a structure formed between adjacent sarcomeres and is found at each end of the sarcomere in striated muscle and defines the lateral boundaries of the sarcomere, its function is to give anchorage to titin and to the outer ends of the thin filaments.  Due to this anchoring function, the Z-lines are responsible for force of transmission and during contraction, as the sarcomere shortens, the distance between Z lines lessens

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the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.