Psio 201 Exam 3 Study Exam (100% Correct And Graded A+)

tropomyosin {Ans: found in thin filaments covers the myosin binding sites on actin when muscle is relaxed}crossbridge cycling step 1 {Ans: myosin binding sites on actin become exposed with Ca2+ binds to troponin}excitation-contraction coupling step 4 {Ans: Ca2+ binds to troponin on thin filament myosin binding site on actin gets exposed}length-tension relationship {Ans: tension generated is proportional to the number of cross bridges formed peak tension is developed at an intermediate sarcomere length}how to name a movement {Ans: action + name of segment that moves ex: flexion of the forearm}types of body movements {Ans: flexion/extension abduction/adduction}excitation-contraction coupling step 5 {Ans: crossbridges form => tension is generated and contraction starts}example of lever systems {Ans: first class levers second class levers third class levers}structural proteins {Ans: titin, dystrophin, alpha-actinin, myomesin, nebulin}fiber types {Ans: slow, fast, intermediate}alpha actinin {Ans: found in the Z disc binds to actin molecules of the thin filament and to titin}muscle fibers {Ans: can be very large; 100 microliters in diameter and many cm long typically multinucleated (arises from fusion of myoblasts)}satellite cells {Ans: have the ability to undergo mitosis after birth to aid in muscle