cell structure and function
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Cells are the Structural and Functional Units of an Organism
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Cells are Diverse in Size, Shape, and Length
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Parts of a Cell: Nucleus, Cytoplasm, and Plasma Membrane
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The Cytoplasm
The major functional area of the cell.
Consists of:
Cytosol
Organelles
Inclusions
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Inclusions: Stored Nutrients
Glycogen
Lipid (brown fat)
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Melanin Secretory Granules
Substantia Nigra Pancreas
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Mitochondria - Structure
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Mitochondria
The site of ATP production.
Metabolically active cells have more mitochondria.
Are self-replicating.
May have evolved from purple bacteria.
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Ribosomes
Composed of protein and rRNA.
May be free in the cytoplasm or bound to endoplasmic reticulum.
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Rough Endoplasmic Reticulum
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Endoplasmic Reticulum
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Smooth Endoplasmic Reticulum
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The Golgi Apparatus
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The Golgi Apparatus
Plasma Cells
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Lysosomes
Sites of digestion.
Lysosomal enzymes are produced by the RER.
The lysosomal membrane has special adaptations.
Lysosomes function in:
1. Digestion of ingested particles2. Digestion of worn-out organelles3. Metabolism of stored glycogen
Lysosomal rupture results in autolysis.
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Lysosomes Phagocytosis
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Peroxisomes
Convert free radicals to H2O2
Required for detoxification
Self-replicate
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Peroxisomes
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The Cytoskeleton
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Cytoskeletal Elements
Microtubules:
* Hollow tubes formed by proteins called tubulins
* Comprise the centrosome and other structures (e.g., cilia & flagella)
* Variable stability (mitotic spindle is labile)
* Maintain cell shape and rigidity
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Structure of a Microtubule
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Cilia
Basal bodies control the assembly of theaxoneme.
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Structure of Cilia
Axoneme
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Cytoskeletal Elements
Microfilaments:
consist of thin strands of actin
form the core of microvilli, allow amoeboid movement, produce the cleavage furrow
most highly developed in muscle cells
labile
are attached to the cytoplasmic side of the plasma membrane
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Cytoskeletal Elements
Intermediate Filaments:
Intermediate in size
Have tensile strength
Most stable
Specific names in certain cell types (see table 2-4)
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The Nucleus
The largest organelle and has 3 regions:
nuclear membrane
nucleolus – protein and rRNA
chromatin – DNA and histone proteins
euchromatin - active(vesiculate nucleus)
heterochromatin - inactive(pachychromatic nucleus)
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The Nucleus
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Nuclear Pores
200,000 X 48,000 X
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Nucleosomes – the fundamental units of chromatin
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Intracellular Pigments
* Endogenous or exogenous (environmental)
* Exogenous pigments include carbon and other dusts
* Endogenous pigments: lipofuscin, melanin, hemosiderin.
Apoferritin + iron = ferritin
hemosiderin = large amounts of ferritin
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Endogenous Intracellualr Pigments - Hemosiderin
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Exogenous Intracellular Pigments
Silicosis
Asbestosis
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Endogenous Intracellular Pigments
Lipofucsin