NEET2026Zoology-Muscle Physiology
NEET 2026 Zoology Muscle Contraction Multiple Correct Question
Type: Multiple Correct-conceptual-Medium-Class 11
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 of sarcomere takes place, by pulling actin filaments towards the centre of 'A' band.
A
C and D only
B
A and B only
C
C and E only
D
A, B, D and E only
Correct Answer
Option D
Detailed Explanation
Statements A, B, D and E are correct while statement C is incorrect. Ca⁺⁺ binds to troponin, facilitating cross bridge formation.
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