Zoology: Locomotion and Movement

Choose the correct statements regarding muscle contraction. A. A motor neuron carries a signal sent by the CNS to the sarcolemma of the muscle fibre. B. The neural signal generates an action potential which causes the release of Ca++ into sarcoplasm. C. Increase in Ca++ inactivates the actin for breaking cross bridges. D. Actin binds to the myosin head to form a cross bridge. E. Shortening of sarcomere takes place by pulling actin filaments towards the centre of the 'A' band. Choose the correct answer: