5 Histology (Lecture) Flashcards
Histology
a group of similar or identical cells that work together
Four primary tissues
Epithelium, Connective, Muscle Nerve
XXX Functions of Epithelium
Protective barrier against the external enviromnent IE skin digestive tract, urinary, respiratory, reproductive.
Narrow spaces - no spaces between cells
Epithelium
Regenerate continuosley replace themselves. Normally fast dividing cells
Epithelium
What type of cells are avascular
Epithelial
Absorbtion What ever gets into the body comes in through
Epithelium
XXX Faces out the external environment
Apical surface of Epithelium
Faces internal surface
Basal surface of Epithelium
Protein fibers that connect all the epithelial cells to the body
Basement membrane of Epithelium
What are glands made out of
Epithelium
Cell layers (simple)
one cell layer thick
Cell layers (stratified)
2 or more cell layers thick
Cell shape (squamous)
thin and flat (fried egg)
Cell shape (cuboidal)
cube shaped
Cell shape (clumnar)
colum shaped
State layer then shape
simple squamous
Pseudostratified Epithelium
Psuedo stratified columnar. these epthilium always have cilia
Transitional epithelium
can change shape found in bladder and uterus
Endocrine glands
secrete chemicals into blood stream
Exocrine glands
secrete into a duct
Merocrine (eccrine)
they secrete by exocytosis
Apocrine
mammary shed large pieces of the cell
Holocrine
oil glands when they release material the explode
Connective tissue (unattached cells)
there is always space between cells
Connective tissue (matrix)
The material that fills the space between cells
Connective tissue (divide slowly)
sometimes they won’t divide unless there has been an injury. Bone is slow Skin is fast
Connective tissue (protects________& connects ________
organs and structures (muscle to bone)