Citoplasma Seminar
description
Transcript of Citoplasma Seminar
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Cell structureCell structure
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RibosomeRibosome
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Endoplasmic Reticulum-set of interconnected membranes. Forms cisternae. 2 types:
Rough ER - studded with ribosomes that are attached to cytosolic side of rER
Smooth ER- no ribosomes
*Ribosomes formed in nucleolus*
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The Endoplasmic ReticulumThe Endoplasmic Reticulum
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Endoplasmic Reticulum (ER) - system of tubes and sacs formed by membranes
Rough = modifies proteins produced on the ribosomes. Synthesis of proteins for export from the cell, integral proteins of cell membrane, enzymes of lysosomes
Smooth = functions in lipid synthesis (including steroids), carbohydrate synthesis and metabolism, drug detoxification, and calcium storage in muscle cells
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0.5 micrometers
smooth endoplasmic reticulum
vesicles
ribosomes
rough endoplasmic reticulum
0.5 micrometers
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Figure 3.9 The Golgi ApparatusFigure 3.9 The Golgi Apparatus
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Functions of the Golgi Functions of the Golgi ApparatusApparatus
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MitochondrionMitochondrion
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MitochondriaMitochondria
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LysosomesLysosomesMembrane bound vessels that pinch off from Golgi apparatusContain digestive enzymesPerform clean up and duties
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LysosomesLysosomes
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LysosomeLysosome
From Krogh, “Biology: A Guide to the Natural World, 2nd edition
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nucleus
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CytoskeletonCytoskeleton
Major components:
1. Microtubules (composed of tubulin subunits)
2. Microfilaments (mostly actin and myosin)
3. Intermediate filaments
Functions: support & movement of cellular structures & materials
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CytoskeletonCytoskeleton
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2 centrioles direct formation of mitotic spindle
In 9+0 array
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CiliaCilia Cell surface Cell surface
projectionsprojections Capable of Capable of movementmovement Moves materials Moves materials over over
the cell surfacethe cell surface Sensory capabilitiesSensory capabilities
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Centrioles and CiliaCentrioles and Cilia
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MicrovilliMicrovilli
Extension of plasma Extension of plasma membranemembrane
Increase the cell Increase the cell surfacesurface
Normally manyNormally many on on each celleach cell
Form a brush Form a brush border on the apical border on the apical surface of the cellsurface of the cell
Do not moveDo not move
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