Plasma Membrane Flashcards
What is pinocytosis?
When drops of water are ingested
What is endocytosis?
When the membrane invaginates forming a vesicle which separates on the inside surface of the membrane
What is exocytosis?
When a vesicle fuses with the membrane and releases its contents out the cell
What are the junction types in cell adhesion?
Occluding
Cell-Cell anchoring
Channel forming
Cell-Matrix anchoring
What is the function of a tight junction?
Seals gaps between epithelial cells
Limits the passage of ions and molecules through the intercellular space
What are the two types of cell-cell anchoring?
Adherens junction
Desmosome
What is connected in an adherens junction?
Actin filament bundle in one cell is connected with that in the other
What does a desmosome connect?
Intermediate filaments
What is the type of junction that is channel forming?
Gap junction
What is the function of a gap junction?
Links 2 cytoplasms together
Allows the passage of small water soluble molecules between cells
Describe the structure of cell-matrix anchoring
Actin filaments in the cell are linked to the extracellular matrix
What do hemidesmosomes do?
They anchor intermediate filaments in a cell to the extracellular matrix.
What are the methods of cel signalling?
Contact dependant
Paracrine
Synaptic
Endocrine
What is the difference between paracrine and endocrine signalling?
Paracrine signalling - produces paracrine factors that diffuse over a short distance - altering behaviour in nearby cells
Endocrine - Hormones are released from the cell into the bloodstream
