Question

1:Myosin ATPase, 2:excitation-contraction coupling, 3:calcium, 4:depolarization, 5: acetylcholine, 6: creatine kinase, 7: excitation, 8: troponin, 9: actin, 10: epinephrine, 11: sarcolemma, 12: muscle shortening, 13: myosin, 14 sodium The process of ______ begins with the ______ and subsequent ______ of a motor nerve. Afterwards, ______ is released form the motor endplate and the muscle ______ membrane depolarizes. ______ is released and binds to ______ resulting in the exposure of ______ binding sites. The ______ head binds and ______ splits ATP to ADP and inorganic phosphate. The final outcome is _______.

Answer 1

The process of excitation-contraction coupling begins with the depolarization and subsequent excitation of a motor nerve. Afterwards, acetylcholine is released from the motor endplate and the muscle sarcolemma membrane depolarizes. Calcium is released and binds to troponin resulting in the exposure of actin binding sites. The myosin head binds and Myosin ATPase splits ATP to ADP and inorganic phosphate. The final outcome is muscle shortening.

Step-by-step explanation:

The paragraph above summarizes the process of muscle contraction, which happens thanks to the release of acetylcholine in the neuromuscular junction, after the neuron is depolarized. The presence of acetylcholine will ultimately lead to the release of stored calcium so it can bind to a protein in the sarcomere called troponin. The binding of calcium and troponin will expose actin binding sites, making the binding of actin and myosin possible. The ATPase found in the myosin head will make use of ATP to produce the movement of myosin - this is how muscle contraction happens.