Tissues Flashcards
What are tissues?
A group of similar cells that function together
What is the study of cells?
Histology
What does a pathologist do?
Examine tissue for damage and disease
Where are cell junctions located?
In most epithelial tissue and some muscle and nerve cells
What is the function of a tight junction?
Few cells together tightly to prevent substances passing between cells
What is the function of Adherens junctions?
Resist separation of cells when stretched
What is the function of desmosomes?
To prevent separation of cells under tension or contraction
What is the function of hemidesmosomes?
Attach cells to membranes and not to each other
What is the function of gap junctions?
Allows cells to communicate with one another
Where are tight junctions located?
Lining of stomach, intestines, and Bladdar
Where are Adherens junctions located?
Urinary bladder and uterus
Where are desmosomes located?
Epidermis and cardiac muscle cells
Where are Hemidesmosomes located?
Skin cells attached to basement membrane
Where are gap junctions located?
Nervous system, heart muscle, gastrointestinal tract
What do Exocrine glands do?
Secrete substances through tubes or ducts (sweat glands)
What do endocrine glands do?
Secrete into interstitial fluid and blood
Thyroid, pituitary gland
What are the three types of surfaces for epithelial tissue?
Ethical, lateral, basal
What are the three epithelial tissue functions?
Selective barriers- limit transfer of substances in and out of the body
Secretory services
Protective services
What does extracellular matrix consist of?
Ground substance, protein fibers
What is the function of extracellular matrix?
Provide strength to tissue to resist stretching and compressive forces
What do collagen fibers do?
Resist to tension and pressure
What do elastic fibers do?
Allow stretching without breaking
What do reticular fibers do?
Scaffold that support cells and ground substances
Name the four functions of connective tissue?
Connecting in binding, support, protection, transport
