Sores appear 1-10 days after exposure to the bacteria. Microsoft Word â CD letter â impetigo 0308.doc Author: INGJ Created Date: EXPOSURE NOTICE Revised: May 19 checked below: ALWAYS CONSULT WITH A PHYSICIAN FOR TREATMENT. { } CHICKEN POX-onset about 2 to 3 weeks after exposure.
Microglia are the cells in the CNS that can do this in normal, healthy tissue, and they are therefore also referred to as CNS-resident macrophages. The ependymal cell is a glial cell that filters blood to make cerebrospinal fluid (CSF), the fluid that circulates through the CNS. Because of the privileged blood supply inherent in the BBB, the extracellular space in nervous tissue does not easily exchange components with the blood.
The healthy human brain contains tens of billions of neuronsâspecialized cells that process and transmit information via electrical and chemical signals. They send messages between different parts of the brain, and from the brain to the muscles and organs of the body. Alzheimerâs disease disrupts this communication among neurons, resulting in loss of function and cell death. Key Biological Processes in the Brain Most neurons have three basic parts: a cell body, multiple dendrites, and an axon. 1  The cell body contains the nucleus, which houses the genetic blueprint that directs and regulates the cellâs activities. 2  Dendrites are branch-like structures that extend from the cell body and collect information from other neurons.