Chapter 3 Part 1 Flashcards
What separates intracellular fluids from extracellular fluids?
plasma membrane
The ______ is a glycoprotein/carb/lipid substance surrounding the cell that provides highly specific biological markers by which cells recognize one another (and the body its own cells)
glycocalyx
What is the depiction of the structure of of the membranes of a cell as a double bilayer of lipids with imbedded, dispersed proteins?
fluid mosaic model
What does the bilayer consist of?
phospholipids, cholesterol, and glycolipids
______ are lipids with bound carbohydrate.
Glycolipids
True or false:
Phospholipids only have a hydrophobic bipole.
False!
Phospholipids have both hydrophobic and hydrophilic bipoles.
What are the 6 functions of membrane proteins?
1.) intercellular adhesion
2.) receptors for signal transduction
3.) enzymatic activity
4.) attachment to cytoskeleton and extracellular matrix
5.) cell-cell recognition
6.) transport
(i-react)
20% of all membrane lipid is ______.
cholesterol
______ make up 20% of the other membrane surface, are composed of sphingolipids and cholesterol, and are concentrating platforms for cell-signaling molecules.
Lipid rafts
Type of anchoring junction.
A.) Gap junction
B.) Tight junction
C.) Desmosomes
Desmosomes
Present in electrically excitable tissues.
A.) Gap junction
B.) Tight junction
C.) Desmosomes
Gap junction
Abundant in tissues subjected to great mechanical stress.
A.) Gap junction
B.) Tight junction
C.) Desmosomes
Desmosomes
Help prevent molecules from passing through the extracellular space between adjacent cells.
A.) Gap junction
B.) Tight junction
C.) Desmosomes
Tight junction
Communicating junction.
A.) Gap junction
B.) Tight junction
C.) Desmosomes
Gap junction
_____ diffusion is for nonpolar and lipid substances.
Simple diffusion
