The sarcolemma covers the muscle cells.

He is working out his muscles at the gym every day.

The whole town was covered in snow.

I strained a muscle at the gym yesterday.

He returned the sword to its sheath.

Please look at my new bow case.

This cell is dividing very actively.

He lied to conceal the truth.

This insect's elytron has a very beautiful pattern.

When the myelin sheath of nerve cells is damaged, nerve transmission slows down.