Tissue Level of Organization Flashcards
A tissue is a group of _____ working together to perform a ________ ________.
cells, specific function
What are the 4 main types of tissue?
Epithelial, connective, muscle & neural
Epithelial tissue is a continuous _____ of closely bound cells.
sheet
What are the 3 possible shapes of epithelial tissue?
squamous (long & thin), cuboidal (squares), columnar (tall & thin)
What are the 3 possible arrangements of epithelial tissue?
simple (1 layer), stratified (multiple layers), pseudostratified (1 layer that looks like many)
Where can you find simple squamous epithelial cells?
Alveoli, capillaries & serous membranes (very thin & permeable).
Where can you find stratified squamous epithelial cells?
Skin, mouth, esophagus, etc. (areas often exposed to abrasion or trauma).
Where can you find simple cuboidal epithelial cells?
Kidneys, thyroid.
Where can you find stratified cuboidal epithelial cells?
Sweat glands.
Where can you find simple columnar epithelial cells?
Digestive system (stomach & intestines), female reproductive system.
Where can you find stratified columnar epithelial cells?
Salivary glands.
Where can you find pseudostratified ciliated columnar epithelial cells?
Urethra, trachea, bronchi, male reproductive system.
__________ epithelial cells can change shape.
Transitional.
Where can you find transitional epithelial cells?
Bladder, uterus & other structures that often stretch/extend.
The ______ side of epithelial tissue is exposed to an internal or external environment.
apical
Epithelial tissue is rich in _______ ______ but has no _____ _______.
Sensory nerves (well innervated), blood vessels (avascular).
How do epithelial tissue get their nutrients if they don’t have blood vessels?
Nutrients are diffused or absorbed from the apical or basilar surface.
What are the 4 functions of epithelial tissue?
- Protect underlying surfaces (stratified squamous).
- Control permeability (simple squamous).
- Provides sensation.
- Produces secretions (glandular epithelia).
Where can you generally find epithelial tissue?
Covers all exposed surfaces, internal passages, hollow organs, cavities & ducts.
What are the 3 components of connective tissue?
Cells, extracellular fibres & ground substance.