Non-membranous Organelles
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Transcript of Non-membranous Organelles
Non-membranous Organelles
Presaented by- Dr. Subarna DasResident, Dept. of Anatomy, BSMMU
Guided by-Dr. Zinnat Ara YasminAsst. Prof, Dept. of Anatomy, BSMMU
Objectives• Describe the nonmembranous
organelles of a typical cell with their structure and specific functions.
• Summarize the process of protein synthesis.
Cell Organelles
Organelle= “little organ”
Non-membranous Organelles
1.Ribosomes2.Centrioles3.Cytoskeletons- Microfilaments Intermediate filaments Microtubules4.Proteasomes
Ribosome• Site of protein synthesis
• Found attached to rough ER or floating free in cytosol
• Produced in a part of the nucleus called the nucleolus
Types of RibosomesRibosome
Free Ribosome Polysome
TypesRibosome
Synthesis of ProteinRibosome
Synthesis of ProteinRibosome
Proteasomes
Proteasomes
Structure of proteasomes Proteasomes
a
c
Proteasomes
Cytoskeleton
Microfilaments, Microtubules form “Skeleton” of the cell
Cytoskeleton
MicrotubulesMicrofilaments
(Actin Filaments)Intermediate
Filaments
Structure of CytoskeletonCytoskeleton
Cytoskeleton
MicrofilamentsCytoskeleton
Structure of MicrofilamentCytoskeleton
Function of MicrofilamentCytoskeleton
Cytoskeleton
Function of MicrofilamentCytoskeleton
Function of Microfilament
Cytoskeleton
Function of MicrofilamentCytoskeleton
Intermediate Filament Cytoskeleton
Is similar to Anchor
Intermediate FilamentCytoskeleton
MicrotubulesCytoskeleton
analogya microtubule
is similar torailroad tracks
Microtubules
Cytoskeleton
The flagella and cilia are composed of microtubules
MicrotubulesCytoskeleton
Cilia & Flagella Structure
• Bundles of microtubulesWith plasma membrane
MicrotubulesCytoskeleton
Microtubules
Cytoskeleton
Microtubules
Cytoskeleton
Microtubules
Cytoskeleton
Microtubules
Cytoskeleton
Examples of cytoskeletal pathologies
• Immotile cilia syndrome (Kartagener’s synd.) Bronchiectasis
• Decreased sperm motility Sterility
• Neurofibrilary tangle Alzheimer’sdisease
•Desminopathy
Cytoskeleton
Centriole• Aids in cell division• Usually found only in
animal cells• Made of microtubules
Fig. 6-22Centrosome
Microtubule
Centrioles0.25 µm
Longitudinal section of one centriole
Microtubules Cross sectionof the other centriole
Centriole
Structure of CentrioleCentriole
Structure of Centriole
Centriole
Centrioles in cell division Centriole