Tissues 1: Epithelial cells 1 Flashcards Preview

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Flashcards in Tissues 1: Epithelial cells 1 Deck (17)
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1

Which organelle has double membrane

The nucleus, it has an outer and inner membrane called the nuclear envelope

2

What happens at the nucleolus

Ribosome subunits are produced

3

What is the nuclear envelope continous with?

The ER

4

Where are ribosome subunits produced

Nucleolus

5

What is the function of ER

Packaging and processing proteins

6

What are nuclear pores?

The are proteinc complexes that control what enters and leaves the nucleus

7

What kinds of ER are there, what are there functions?

rER-Rough endoplasmic reticulum: Flattened sheets, continous with nuclear envelope and have ribosomes attached on its outer surface, involved in protein synthesis
sER-Smooth endoplasmic reticulum: Tubular membranes involved in lipid metabolism

8

What is the golgi apparatus and what does it do?

Stacked, flattened membranes sacs which modify, package & sort macromolecules for secretion or delivery

9

what are the compartments?

Cis face
Cis golgi network
Cis cisterna
media cisterna
Trans cisterna
Trans golgi network
Trans face
Golgi vesicle
Secretory vesicle

10

Explain:
Phagocytosis
Pinocytosis

Cell eating-Internaliation of large particles
Cell drinking-Internalisation of extracellular fluid
Major function=receptor mediated endocytosis

11

Mitochondria?

Where ATP is produced via oxidative phosphorylation & TCA cycle

12

Peroxisomes

Enzymes contained involved in lipid and oxygen metabolism

13

What are the 3 types of filament?

Microtubules
Microfilaments
Intermediate filaments

14

Microtubules
S&F

Polymers of alpha & beta tubulin
20nm diameter (roughly)
some part in cell shape & act as tracks for organelles around cell
Major components of cilia and flagella
arranged in 9.2 formation in cilia
Part of spindle fibres

15

What is the name of the point from which Microtubules tend to radiate from

Microtubule organising centre(MTOC)

16

Intermediate filaments
S&F

A group of filamentous proteins forming rope like filaments
10-15nm diameter(in between the other two)
Different cell types=different filalements
Give mechanical strength
Desmosomes: Connected by cytokeratins(IF)
Nuclear Lamins:Stabilise the envelope and are network of IF on internal surface

17

Microfilaments
S&F

Actin polymer with adhesion belts to other plasma membrane proteins
Helical structure
Monomer=G actin, Polymer=F actin
Cell shape and movement
Done by accessory proteins associating with e.g. myosin
Usually near periphary of the cell
Can be broken down and reformed providing cell with mobility