In this lab students will observe how muscle fatigue affects the amount of work muscles can do. Students will make predictions on how intense exercise affects how much work their muscles can handle without a break. When skeletal muscles contract and relax (shorten and lengthen), they cause bones to move. This is work, and all work the body does requires ATP, which is the energy currency in our bodies. ATP is produced through the process of cellular respiration. Muscles use up
