Part of the Arabian Desert, the Rub al-Khali, meaning âempty quarterâ in Arabic, is the largest region of continuous sand in the world, and the driest. It lies in a structural basin and stretches across an area of roughly 250,000 square miles (650,000 square kilometers.)
How do ciliates move?   Answer   Ciliates, a unicellular protozoa, use their cilia, tiny hair-like organelles, to move around. What are ciliated CNS neuroglia that play an active role in moving the cerebrospinal fluid called? Ependymal cells are cells that line the central cavities of the brain and spinal cord. They are ciliated and act as a semi-permeable lining between the cavities and normal tisâ¦sue.
Cerebrospinal fluid (CSF), clear, colourless liquid that fills and surrounds the brain and the spinal cord and provides a mechanical barrier against shock. Formed primarily in the ventricles of the brain, the cerebrospinal fluid supports the brain and provides lubrication between surrounding bones and the brain and spinal cord. When an individual suffers a head injury, the fluid acts as a cushion, dulling the force by distributing its impact.