Skeletal Muscle Contraction IV: Isotonic vs. Isometric Contractions

Practice: Your Clutch physio tutor goes to the gym and tries to do a 200-lb deadlift. Unsurprisingly, he cannot. Which of the following types of contractions is occurring in his muscles when he’s trying—but failing—to do this lift?

Practice: Your Clutch physics tutor goes to the gym and tries to do a 200-lb deadlift. He does it with perfect form. Which of the following types of contractions is occurring in his muscles when he’s completing this lift?