Bio 465 Final Exam 2024-2025 /complete Actual Exam Questions And Correct Answers (Verified Answers)

what is responsible for a sarcomere shortening during muscle contraction? - ANSWER-actin filaments slide past myosin filaments what is true about H zones and I bands? - ANSWER-H zones only contain thick filaments and I bands only contain thin filaments what occurs when muscle contraction results in sarcomere shortening? - ANSWER-H band width stays the same and I band narrows in skeletal muscle cells, contraction is initiated when Ca2+ binds to _________? - ANSWER-troponin what initiates the detachment of cross-bridge heads from the thin filament? - ANSWER-ATP binding to the myosin head what results in the transfer of energy into the conformational state of cross-bridges? - ANSWER-ATP being hydrolyzed into ADP and Pi (phosphate) what is most closely associated with the conformational change of the myosin head that moves the thin filament? - ANSWER-the dissociation of ADP and Pi from the cross bridge head rigor mortis is the stiffness of skeletal muscles after death due to the loss of ability to resynthesize ATP. What chemical formula represent the state of cross-bridges in rigor mortis? - ANSWER-AMwhat best represents the chemical state of resting muscle? - ANSWER-A+MADPPi most of the energy used by muscles during a 45-second Sprint is obtained from