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
