Choose the correct statements regarding muscle contraction. A. A motor neuron carries a signal sent by the Central Nervous System (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

Step-by-step solution

Statement A is correct: Muscle contraction is initiated by a signal sent by the Central Nervous System (CNS) via a motor neuron to the neuromuscular junction, which is the junction between a motor neuron and the sarcolemma of the muscle fibre. Statement B is correct: The neural signal releases a neurotransmitter (acetylcholine) which generates an action potential in the sarcolemma. This action potential spreads through the muscle fibre and causes the release of Ca ⁺⁺ ions into the sarcoplasm. Statement C is incorre