Which of the following statements is most accurate?
A) T tubules may be sliding during isotonic contraction.
B) Myofilaments slide during isometric contractions.
C) Muscle tension remains relatively constant during isotonic contraction.
D) The I band lengthens during isotonic contraction.

Question

Quizplus · Accepted Answer

During isotonic contractions, the muscle fibers change length and the tension in the muscle remains relatively constant. This is because the force generated by the muscle is equal to the load being moved. The other statements are not accurate. T tubules do not slide during contraction, myofilaments slide during isotonic contractions (not isometric), and the I band shortens (not lengthens) during isotonic contractions.

Which of the Following Statements Is Most Accurate