What is sarcolemma?

1. The plasme membrane of muscle cell is known as sarcolemma. 2. Hydrostatic skeleton is stiff bony stucture present in fishes. 3. The vertebral ribs are not connected to sternum.

Following is given a randomly arranged list of events that occur at neuromuscluar junction to trigger mucle contraction. (i) Receptor sites on sarcolemma Nerve impulse (iii) Release of Ca^(+2) from sarcoplasmic reticulum (iv) The neurotransmitter acetylcholine is released (v) Sarcomere shorten (vi) Synaptic cleft (vii) Spread of impulses over sarcolemmna on T-tubules Which of the following gives the correct sequence of these steps?

What is myopia? What is its remedy?