Which of the following is the correct order of arrangement of vertebrate column from the head to toe?
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 $\mathrm{Ca}^{++}$into sarcoplasm.
C. Increase in $\mathrm{Ca}^{++}$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:
$$ \text { Match List I with List II related to muscular/skeletal system: } $$
| $$ \text { List I } $$ |
$$ \text { List II } $$ |
||
|---|---|---|---|
| A. | Tetany | I. | Inflammation of joints |
| B. | Arthritis | II. | Autoimmune disorder affecting neuromuscular junction |
| C. | Myasthenia gravis | III. | Wild contraction in muscle due to low $\mathrm{Ca}^{++}$in body fluid |
| D. | Muscular dystrophy | IV. | Progressive degeneration of skeletal muscle |
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