What is happening to a muscle when you are pushing or pulling on an immoveable object?

hhfhfhfhffhfh asked: What is happening to a muscle when you are pushing or pulling on an immoveable object? A. The muscle is lengthening as in eccentric contraction B. A concentric contraction is when your muscle is producing more force than the resistance you are using C. The muscle is neither lengthening nor shorting as in an isometric contraction D. An isometric contraction occurs when there is a contraction of the muscle, but there is no movement Muscle-Build.com