Locomotion and Movement

The contractile protein of thin filaments is:

During muscle contraction, which of the following remains constant?

The joint between atlas and axis is:

Total number of bones in an adult human:

Which ion is essential for muscle contraction?

Choose the correct statements regarding muscle contraction. A. A motor neuron carries a signal sent by the CNS to the sarcolemma. 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. ( NEET 2026)

Which of the following statements are correct with reference to human endoskeleton? A. Human skull is monocondylic. B. The joint between any two adjacent vertebrae is a cartilaginous joint. C. In human beings, the number of cervical vertebrae is seven. D. All ribs except the last 2 pairs are bicephalic. E. The occipital bone of skull is articulated with atlas vertebra. ( NEET 2026)

Match List I with List II related to muscular/skeletal system — A. Tetany, B. Arthritis, C. Myasthenia gravis, D. Muscular dystrophy — with I. Inflammation of joints, II. Autoimmune disorder affecting neuromuscular junction, III. Wild contraction in muscle due to low Ca++ in body fluid, IV. Progressive degeneration of skeletal muscle ( NEET 2026)