In an ERD,which of the Following Indicates Mandatory or Required

question 45

Multiple Choice

In an ERD,which of the following indicates mandatory or required participation?

• A) circle symbol
• B) cardinality
• C) single line symbol
• D) modality

---

Definitions:

Microglia

Specialized type of glial cell that acts as the main form of active immune defense in the central nervous system.

Ependymal Cells

Glial cells that line the ventricles in the brain and the central canal of the spinal cord, involved in the production and regulation of cerebrospinal fluid.

Oligodendrocytes

Glial cells in the central nervous system that produce myelin, a substance that insulates nerve fibers to increase the speed at which impulses are conducted.

CNS Cavities

Hollow spaces within the central nervous system, including ventricles in the brain, filled with cerebrospinal fluid.