Which of the following is true of isotonic muscle contraction?
a) the tension is greater than the resistance
b) the muscle shortens during contraction
c) the muscle lengthens during contraction
d) all of the above are correct
e) none of the above are correct

Option (D).

Explanation:

Isotonic muscle contractions may be defined as a type of muscle contraction in which the tension remains same but the muscle changes its length.

The muscle length can shorten during isotonic contraction (concentric contraction) or the muscle length increases during the isotonic contraction (eccentric contraction). The tension applied on the muscle is greater than the resistance.

Thus, the correct answer is option (D).

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