Which of these terms means "isolating tension"? 

Henry is getting ready to kick a field goal. When his thigh muscle contracts to straighten his knee right before the kick, this is known as _____ contractions?

Sally is carrying a box of training materials directly in front of her, as she is on her way to set-up a conference room prior to the start of a seminar. While she is walking her biceps are remaining in a fixed position and are not being raised or lowered. Which of the following is this an example of?

Jerrel has to go to physical therapy twice a week after injuring his knee. While there, his physical therapist has him do exercises that are on a machine and will allow Jerrel to put his knee through a full ROM at constant tension throughout the exercise. This is an example of what type of contractions?