Question

question 3 (multiple choice worth 3 points) (02.04r mc) which of the following is an example of a concentric contraction? balancing a stack of books on your head for two minutes curling upward during a series of sit - ups holding a plank position for at least one full minute lowering the torso back to the ground in a sit - up

Explanation:

A concentric contraction occurs when a muscle shortens while generating force. In sit - ups, curling upward involves the abdominal muscles shortening to lift the torso, which is a concentric contraction. Balancing books on the head and holding a plank are isometric contractions (muscle holds a static position). Lowering the torso in a sit - up is an eccentric contraction (muscle lengthens while under load).

Answer:

B. Curling upward during a series of sit - ups