Tissues And Extracellular Matrix Flashcards
What are the 4 different types of tissues
Nervous tissue, muscle tissue, epithelial tissue, connective tissue
Contain specialized cells which rapidly transmit electrical impulses
Nervous tissue
Long cells which are specialized for contraction and relaxation
Muscle tissue
Layers of closely packed cells forming coverings on internal and external surfaces
Epithelial tissue
What are the 3 functions of epithelial tissue
Covering, lining, protecting exposed surfaces, absorption, secretion
Notable characteristics of epithelial tissue
- Cells are tightly packed together w little to no space in between
- Tissue always has a “free surface”
- Tissue is usually anchored to underlying CT via basement membrane.
Basal Lamina (produced by the epithelial cells) + Reticular Lamina (produced by CT cells)
Basement membrane
Lamina Lucida + Lamina dense=
Basal Lamina
More Notable Characteristics of epithelial tissue
- Tissue has no direct blood supply
- Cells in lower layer are usually mitotic
What are two types of epithelial tissues?
Membranous and glandular
A loose arrangement of cells embedded within a support medium
Connective tissue
What are the two functions of CT
- Provides support, structure, and protection
- Binds structure together
Notable characteristics of Connective Tissue
-Composed of cells and supporting ‘extra cellular matrix’
-Cells usually spaced far apart, not direct contact
WELL VASCULARIZED!!
Connective Tissue
Predominately associated with connective tissue but not exclusive to it
Extracellular matrix (ECM)
What is ECM composed of
Fibers and ground substance
Long fibers formed of the protein collagen
Collagen
What are the three types of collagen
- Fibrillar collagen
- Network-forming collagen
- Linking/anchoring collagen
Long, thick strands which are often visible with light microscope, most abundant is formed of TYPE I
Type II and III are also placed in category
Fibrillar collagens
An interlaced network of ultra-thin strands exclusively TYPE IV (4)
Major structural component of Lamina dense component of basal Lamina
Network-forming collagens
Type IV (4)
Short strands which connect Fibrillar collagen to eachother within extracellular matrix
TYPE VII 7 collagen, which anchors reticular Lamina to basal Lamina
Linking/anchoring collagens
Very thin fibers formed predominantly of TYPE III collagen
Reticular fibers
Form a flexible scaffolding within organs like the liver, spleen, lymph nodes, red bone marrow
Reticular fibers
