Ch 4 - Tissues Flashcards
Any grouping of cells that are similar in structure and carry out a similar or common function
Tissue
Four primary types of tissue
- Nervous tissue
- Muscle tissue
- Epithelial tissue
- Connective tissue
Types of nervous tissue
- Neurons
- Supporting cells
Types of muscle tissue
- Skeletal Muscle (voluntary with striations)
- Cardiac Muscle (involuntary with striations)
- Smooth Muscle (involuntary w/o striations)
Where is smooth muscle found?
In walls of hollow organs to move substances within/through
Function of Epithelial tissue
Boundary-forming, transport of molecules/nutrients into/out of organs
Exposed side of epithelial tissue is called
Apical Surface - faces lumen or outside of body
Apical surface may have: (2)
1) microvilli
2) cilia
Unexposed side of epithelial tissue
Basal surface
Membrane deeper than basal surface
Basement membrane
Part of the basement membrane that filters what can/cannot enter the epithelium
Basal Lamina
Deepest layer of the basement membrane that contains fibers belonging to connective tissue
Reticular Lamina
Epithelial cells are joined together by: (2)
Tight junctions and/or desmosomes
Is Epithelial tissue Vascular or Avascular?
(yes or no blood supply)
Epithelial tissue is Avascular
No blood supply, needs to recieve nourishment by diffusion
Is Epithelial tissue Innervated or Enervated
(yes or no nerve fibers)
Epithelial tissue is Innervated
Supplied with nerve fibers
Epithelial classification
Single layer epithelia
Simple epithelia
Epithelial classification
2+ layer epithelia
Stratified epithelia
Epithelial classification
Flat, squashed cells
Squamous cells
Epithelial classification
Even, cube-shaped cells
Cuboidal cells
Epithelial classification
Long, tall, thin cells
Columnar cells
Epithelial classification practice
Multiple layers of flat cells
Stratified squamous epithelial tissue
Epithelial classification practice
One layer of tall cells
Simple columnar epithelial tissue
Functions of Simple Squamous Epithelium
absorption, secretion, filtration
Simple squamous epithelium of pleura, pericardium, and peritoneum
Mesothelium
Simple squamous epithelium making up slick/slippery linings of vessels
Endothelium
Ex. endothelium of blood vessels
Functions of Simple Cuboidal Epithelium
absorption and secretion
found in kidney tubules, ovary surface, some small glands