Which of the following describes the moment arm of the biceps?
The moment arm of the biceps is at its longest when the elbow is flexed 90 degrees
The moment arm of the biceps becomes longer as the elbow is flexed past 90 degrees
The moment arm of the biceps becomes shorter as the elbow is flexed past 90 degrees
The moment arm of the biceps does not change based on the elbow flexion angle