Bio107-ch4lab6 Flashcards
Four primary tissues
- Epithelium
- Connective tissues
- Muscle tissues
- Nervous tissues
Histology
Study of tissues
Epithelium
Linings and coverings
Connective tissues
Connect, support, transport
Muscle tissues
Contract
Nervous tissues
Transmit information
Tissues are classified by
Layers and cell shapes
Layers
Simple or stratified
Cell shapes
Squamous, cuboidal, columnar
Order for writing out tissues
- Layer
- Shape
- Tissue type
Characteristics of epithelium
- Forms a covering or lining for the body, or organs, or body cavities
- Avascular- thin, no blood supply
Cell junctions (3 types)
- Tight junctions
- Gap junctions
- Desmosomes
Simple squamous epithelium
Description, function, location
- Single layer of flattened cells
- Allows materials to pass by diffusion and filtration
- Air sac of lungs, heart, blood vessels, lining of ventral body cavity
Simple squamous epithelium form
Serous membranes
Two types of serous membranes
- Mesothelium- visceral and parietal
2. Endothelium
Visceral ____ organs
Covers organs
Parietal ___ cavities
Lines cavities
Endothelium
Lines blood vessels
Simple cuboidal epithelium
Description, function, location
- Single layer of cube like cells in circular clusters
- Secretion and absorption
- Kidney
Simple columnar epithelium (non-ciliated)
Description, function, location
- Single layer of tall cells with oval nucleus
- Absorption and secretion of mucus and other substances
- Digestive tract
Columnar epithelial often contain
Goblet cells (mucus-secreting)
Pseudostratisfied columnar epithelium- ciliated
Description, function, location
- single layer of cells differing in heights with cilia on outside
- Secretes mucous
- Respiratory tract (smoking kills the cilia in lungs)
Stratified squamous epithelium
Description, function, location
- Thick membrane composed of several cell layers
- Protects underlying tissues
- Nonkeratinized- mouth, vagina
Keratinized- skin