BIOCHEM cell anatomy Flashcards
∙ Cells are not all the same
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∙ All cells share general structures
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∙ Cells are organized into three main regions…
∙ Nucleus
∙ Cytoplasm
∙ Plasma membrane
∙ Control center of the cell
∙ Contains genetic material (DNA)
∙ Three regions: Nuclear membrane, Nucleolus, Chromatin
NUCLEUS
∙ Barrier of nucleus
∙ Consists of a double phospholipid membrane
∙ Contain nuclear pores that allow for exchange of material with the rest of the cell
NUCLEAR MEMBRANE
∙ Nucleus contains one or more nucleoli
∙ Sites of ribosome production
∙ Ribosomes then migrate to the cytoplasm through nuclear pores
NUCLEOLI
∙ Composed of DNA and protein
∙ Scattered throughout the nucleus
∙ It condenses to form chromosomes when the cell divides
CHROMATIN
∙ Barrier for cell contents
∙ Double phospholipid layer: Hydrophilic heads (water loving; polar region) and Hydrophobic tails (water fearing; non-polar region)
∙ Other materials in here are Protein, Cholesterol and Glycoproteins
PLASMA MEMBRANE
Plasma Membrane Specializations
∙ Finger-like projections that increase surface area for absorption
MICROVILLI
Plasma Membrane Specializations
∙Tight junctions
∙ Desmosomes
∙ Gap junctions
MEMBRANE JUNCTIONS
∙ Material outside the nucleus and inside the plasma membrane
∙ Cytosol - Fluid that suspends other elements
∙ Organelles - Metabolic machinery of the cell
∙ Inclusions - Non-functioning units
CYTOPLASM
Cytoplasmic Organelles
∙Made of protein and RNA
∙ Sites of protein synthesis
∙ Found at two locations
∙ Free in the cytoplasm
∙ Attached to rough endoplasmic reticulum
RIBOSOMES
Cytoplasmic Organelles
∙ Fluid-filled tubules for carrying substances
∙ Two types of ER: Rough Endoplasmic Reticulum (Studded with ribosomes, Site where building materials of cellular membrane are formed) and Smooth Endoplasmic Reticulum (Functions in cholesterol synthesis and breakdown, fat metabolism, and detoxification of drugs)
ENDOPLASMIC RETICULUM (ER)
Cytoplasmic Organelles
∙Modifies and packages proteins
∙ Produces different types of packages: Secretory vesicles, Cell membrane components, Lysosomes
GOLGI APPARATUS
Cytoplasmic Organelles
∙Contain enzymes that digest non-usable materials within the cell
LYSOSOMES
Cytoplasmic Organelles
∙Membranous sacs of oxidase enzymes
∙Detoxify harmful substances
∙Break down free radicals (highly reactive chemicals)
∙Replicate by pinching in half
PEROXISOMES
Cytoplasmic Organelles
∙ “Powerhouses” of the cell
∙ Change shape continuously
∙ Carry out reactions where oxygen is used to break down food
∙ Provides ATP for cellular energy
MITOCHONDRIA
Cytoplasmic Organelles
∙Network of protein structures that extend throughout the cytoplasm
∙Provides the cell with an internal framework
∙Three different types: Microfilaments, Intermediate filaments, Microtubules
CYTOSKELETON
Cytoplasmic Organelles
∙Rod-shaped bodies made of microtubules
∙Direct formation of mitotic spindle during cell division
CENTRIOLES
Cellular Projections
∙ Not found in all cells
∙ Used for movement
∙ _____ moves materials across the cell surface
∙ _________ propels the cell
CILIA AND FLAGELLUM
Cell Diversity
cells that connects body parts
FIBROBLAST
ERYTHROCYTES (RBC)
Cell Diversity
cells that cover and line body organs
EPITHELIAL CELL
Cell Diversity
cells that move organs and body parts
SKELETAL MUSCLE CELL
SMOOTH MUSCLE CELL
Cell Diversity
cell that stores nutrients
FAT CELL