Tissues Flashcards
(37 cards)
Tissues
A group of cells w/similar function and structure
4 types of tissues
Connective, epithelial, muscle and nervous
Cytology
Study of cells
Histology
Microscopic study of tissues
Epithelial tissue
Sheets of cells, cover internal and external surfaces, forms glands
Functions of epithelial tissue
Protect, diffusion/filtration, secretion/excretion/absorption, sensory
Basal cell
Base membrane that connects the epithelial cells to the connective tissue
Cell connections
Tight junctions, desmosomes, gap junctions
Tight junctions
Membranes fuse; water tight
Desmosomes
Strong adhesion; Velcro
Gap junctions
Channels between cells
Hemidesmosomes
Between the cell and basement membrane; attach a cell to extra cellular structures
How to classify epithelial tissue
How many layers?
Shape of he cell on the exposed surface
Simple
One layer of cells
Stratified
More than one layer of cells
Squamous
Squished or flattened cells
Cuboidal
Cube shaped cells
Columnar
Tall column like cells with the nucleus lined up
Transitional
Found in the urinary tract
Ciliated pseudostratified columnar
Respiratory tract
Glands
Make and discharge secretions; endocrine & exocrine
Exocrine glands
Act locally; have ducts; have secretory units
Alveolar/acinar
Rounded or bulb shape
Tubular
Test tube shape