Intro to Histology: Epithelial 4.0-4.2 Flashcards
Histology
refers to the study of tissues
Tissues
Are a group of similar cells that are specialized to perform a specific function. Ex) nervous tissues are specialized to conduct nerve impulses
Stem Cells
Cells that are capable of becoming a variety of cells. Ex hemocytoblast
Toitpotent
The ability of a cell or group, to produce all tissues needed for development (zygote)
Pluripotent
The ability of a cell to produce a limited number of different cells. ( hemocytoblast makes seven different blood cells)
Differentiation
Cells specialize depending upon the environment.
Intracellular
Within a cell
Intercellular
Between cells
Apoptosis
programmed cell death ( statifed squamous epithelium of skin)
Nercorsis
Death of cells due to injury / diease
Hypertrophy
Increase in size of cells
Atrophy
Decrease in size or number of cells , Ex ( lack of excecise osteoporosis)
Hyperplasia
Increased in number of cells , anemia causes increase RBC
Metaplasia
Change in type of cell
Neoplasia
Change in cellular DNA, makes different and cancerous
Tissue Types
- Epithelia
- Connective
- Muscle
- Nervous
Epithelia Tissues
Covers all exposed surfaces inside and out Ex ( Lining of organs, glands, skin) Composed of covering or lining that lines skin, digestive, organ walls etc.
Glandular epithelium forms the glands.
Connective Tissues
Fills internal spaces, provides structural support, transports materials, stores energy Ex ( Bones, tendons, fats)