Wk6 Lecture 1 Flashcards
What is an emergent property?
A property which a collection or complex system (tissue or organ) has, but which the individual members (cells) do not have
What is the basal lamina?
“Floor/basement” => all epithelial cells (surface) attach to basal lamina
What is the connective tissue?
“Scaffold” => series of components => matrix => provides structure and anchor points
What is the basis of multicellularity between cells?
Physical connections
Cells of multicellular organisms do what? (2 things)
- Adhere to one another
- Have specific, distinct structures and functions
What are tissues comprised of? (2 things)
- Groups of similar cells
- Performing similar functions
What is epithelial tissue? What does it act as and what are its sites of attachment?
A sheet of cells that covers a body surface or lines a body cavity; acts as a protective barrier w/ cell-cell junctions and cell-matrix junctions
What are the 3 main types of structures connecting neighboring epithelial cells?
- Tight junctions
- Desmosomes
- Gap Junctions
What are tight junctions?
-Composed of specialized proteins
-Located in the plasma membranes of adjacent animal cells
How do tight junctions connect?
The proteins line up and bind to each other, stitching the two cells together to form a watertight seal between the 2 plasma membranes
How are tight junctions watertight?
They bind in a way that make water, which already cannot cross the membrane favorably, cross the membrane multiple times
Are tight junctions dynamic or permanent?
Tight junctions are sturdy, but dynamic
What are desmosomes? What are they common in?
Proteins that link the CYTOSKELETONS of adjacent cells directly; common in epithelial and muscle tissue
How do desmosomes bind?
To each other and to the proteins that anchor cytoskeletal intermediate filaments
