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

The doctor performed a spinal tap to collect cerebrospinal fluid.

She is planning a date with her current boyfriend.

He lost everything.

My boyfriend gave me a gift.

Everyone was surprised by the news.

The cell membrane plays an important role in maintaining the structure of the cell.

The ophthalmologist diagnosed me with uveitis.

Cats close their nictitating membrane when they are surprised.

The serous membrane covers many organs in the body.