Plasma Membrane Flashcards Preview

Science for Medicine > Plasma Membrane > Flashcards

Flashcards in Plasma Membrane Deck (14)
1

What is pinocytosis?

When drops of water are ingested

2

What is endocytosis?

When the membrane invaginates forming a vesicle which separates on the inside surface of the membrane

3

What is exocytosis?

When a vesicle fuses with the membrane and releases its contents out the cell

4

What are the junction types in cell adhesion?

Occluding
Cell-Cell anchoring
Channel forming
Cell-Matrix anchoring

5

What is the function of a tight junction?

Seals gaps between epithelial cells
Limits the passage of ions and molecules through the intercellular space

6

What are the two types of cell-cell anchoring?

Adherens junction
Desmosome

7

What is connected in an adherens junction?

Actin filament bundle in one cell is connected with that in the other

8

What does a desmosome connect?

Intermediate filaments

9

What is the type of junction that is channel forming?

Gap junction

10

What is the function of a gap junction?

Links 2 cytoplasms together
Allows the passage of small water soluble molecules between cells

11

Describe the structure of cell-matrix anchoring

Actin filaments in the cell are linked to the extracellular matrix

12

What do hemidesmosomes do?

They anchor intermediate filaments in a cell to the extracellular matrix.

13

What are the methods of cel signalling?

Contact dependant
Paracrine
Synaptic
Endocrine

14

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