Chapter 4- Tissue Level Of Organization Flashcards
Histology
Science that deals with the study of tissues
Pathologist
Specialize in laboratory studies of cells and tissues for diagnoses
Tissue development in germ layers
Ectoderm
Endoderm
Mesoderm
I’ll connective tissue and most muscle tissue drive from
Mesoderm
Nervous tissue develops from
Ectoderm
Epithelial tissue
Covers exposed surfaces
Lines internal passageways
Forms glands
Connective tissue
Fills internal spaces
Supports other tissues
Transport materials
Stores energy
Muscle tissue
Specialized for contraction
Skeletal muscle, heart muscle, and walls of hollow organs
Neural tissue
Carries electrical signals from one part of the body to another
Epithelial
Layers of the cell covering internal or external surfaces
Glands
Structures that produce secretions
Cellularity
Characteristics of epithelia
Bound closely together by cell junctions
Polarity
Characteristics of epithelia
Structural difference between free(apical) and attached(basal) surfaces
Attachment
Characteristics of epithelia
Basal lamina(basement membrane) connects the basal surface to the underlying connective tissue
Avascularity
Characteristics of epithelia
Lack of blood vessels(avascular)
Generation
Characteristics of epithelia
Epithelial cells that are damaged or lost are continually replaced by stem cell division in the epithelium
Functions of epithelial tissue
Provide physical protection
Expose and internal surfaces from abrasion, dehydration and destruction by chemical or biological agents
Functions of epithelial tissue
Control permeability
Any substance that enters or leaves the body must cross an epithelium
Functions of epithelial tissue
Provide sensation
Some epithelial cells have a large sensory nerve supply and sensitive to stimulation
Functions of epithelial tissue
Purdue specialized secretions
Glandular epithelium produce secretions that provide physical protection, temperature regulation or act as chemical messengers
Specializations of epithelial cells
More fluids over the epithelium
More fluids through the epithelium
Produce secretions
Microvilli
Increase absorption or secretion
Cilia
Move fluid
Cell junctions
Contact points between the plasma membrane of’s tissue cells