Cells, Methods Of Histology Flashcards
Nucleus
Contains genetic information In eukaryotic separated from cytoplasm Chromatin is basophilic Nuclear envelop connected to RER Nuclear pores allow passage of RNA, proteins into cytoplasm
Nucleolus
Dense structure in nucleus
mediates transport between nucleus and cytoplasm
Rough ER
segregate proteins not meant for cytoplasm (attached)
glycosylation of glycoprotiens
synthesis of phospholipids
assembly of multichain proteins
contain polyribosomes
modification and folding of proteins synthesized on ribosomes
Smooth ER
synthesis of some lipids- lipid biosynthesis
continuous with RER
detoxification
sequestration of calcium ions
microvilli
seen on EM
absorptive
form a brush/striated border
tight junction
prevents leakage of material
joins two neighboring cells
Chromatin
basophilic
packaged in coils
DNA with protiens
Nuclear Envelope
separates ad mediates transport between nucleus and cytoplasm
Mitochondria
energy production (ATP) self replicating circular DNA double membrane with cristae protruding inward
Cilia (kinocilia)
motile projections
come from basal bodies
Gap junction
important for communication
Euchromatin
active chromatin
pale in microscope
Ribosomes
Protein synthesis
form peptide bonds to make polypeptide chains
Golgi Apparatus
UPS Center
final assembly and glycosylation of proteins
sorting packaging and delivery
Desmosomes
form cell to cell anchoring contacts
Heterochromatin
inactive
appears dark on slide
Lysosomes
contain hydrolytic enzymes
associated with phagocytosis, pinocytosis
involved in intracellular digestion
kill pathogenic organisms and degrades waste products
Hemidesmosome
basil surface of epithelial cells
Plasma Membrane
communication- receptors that recognize and respond to signals
intercelluar connection- flexible boundary, protects cellular contents, supports cell structure
physical barrier= phospholipid bilayer
selective permeability- regulates entry and exit of ions, nutrients and waste molecules
Proteasomes
small enzymatic complexes for intracellular digestion
Peroxisomes
enzyme catalase which can degrade intracellular hydrogen peroxide
Stereocilia
nonmotile projections, absorptive
