निम्नलिखित में से कौन से विकार कंकाल प्रणाली/जोड़ों से जुड़े हैं? 1. मायस्थेनिया ग्रेविस (Myasthenia gravis)2. अर्थराइटिस या गठिया (Arthritis)3. गाउट (Gout)4. ऑस्टियोपोरोसिस (Osteoporosis) सही विकल्प चुनें:

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. Choose the correct answer from the options given below:

Which of the following statements are correct with reference to human endoskeleton? A. Human skull is monocondylic. B. The joint between any two adjoining 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. Choose the correct answer from the options given below: