BIO 230 Exam 4 with Complete Solutions Already Passed

BIO 230 Exam 4 with Complete Solutions Already Passed nervous tissue functions - ️️ - generates and conducts electrical signals - rapidly senses internal and external environment - processes info and controls responses central nervous system - ️️ brain and spinal cord peripheral nervous system - ️️ nerves running to and from rest of body nerve cell types - ️️ neurons glial cells neuroglia (glial cells) - ️️ - support cells that can divide - major types: 1. microglia: phagocytic, remove wastes 2. astrocytes: provide nutrients, maintain 3D structure, help form blood-brain barrier, limited tissue repair 3. ependymal cells: produce cerebrospinal fluid (cuboidal cells, fluid your brain sits in) 4. 2 types of myelinating cells myelination - ️️ - myelin: lipid-rich cell membrane that electrically insulates axons (prevents ions from getting in/out) - oligodendrocytes: in CNS, myelinate several axons