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) is a clear liquid characterized by high ion and protein content that fills the ventricular system and subarachnoid space of the brain. Following neural tube closure, enlargement of the ventricles is driven by CSF secretion from ependymal cells. During later development, CSF is primarily secreted by the specialized epithelia of the highly vascularized choroid plexus (CP).