Examlex
Which of the following is an endocrine gland that raises blood calcium levels?
Hydrogen
The lightest and most abundant element in the universe, consisting of one proton and one electron, and widely used in chemical reactions and as a potential clean energy source.
Microglia
Specialized glial cells in the brain and spinal cord that act as macrophages, cleaning up debris and dead cells.
Immune System
The body's defense system against infections, diseases, and foreign substances, comprised of various organs, cells, and proteins.
Astrocytes
Star-shaped glial cells in the brain and spinal cord involved in physical support, removal of debris, and transport of nutrients to neurons.
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