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19 Cards in this Set

  • Front
  • Back
the control center of cell activities both metabolic and reproductive
Nuclear membrane?
bi-lipid membrane
Nucleolus (nucleoli)?
contain RNA, site of ribosome synthesis
stringy, threadlike, consists of nucleo proteins (chromosomes)
finger like projections found in the living of the small intestine and in the kidney tubules
hairlike projections, which move fluids along a surface, example respiratory tract- mucus, reproductive system
threadlike projections that help move the cell, ex. spermcell
Tight Junctions?
impermeable junctions that bind cells together into leakproof sheets that prevent substances from passing through the extracellular space between cells- adjacent cell membranes fuse
anchoring junctions that prevent cells subjucted to mechanical stress form being pulled apart- thickeningof adjacent membranes and are connecter by fire protein filaments
Gap junctions?
allow communication between cells, ions can pass directly from cell to cell, connected between cells by connexons(hollow protein cylinders between cell membranes)
Physical processes?
does not require energy from the cell- moves based on concentration gradient
movement of molecules from higher to lower concentration; gradient 1. speed affected by size and temperature
special type of diffusion- diffusion of waterthrough a selectively permeable membrane: moves down or with concentration gradient
Facilitated diffusion?
diffusion of lecules across the membrane down or with the concentration gradient through a carrier protein
movement of fluid and solutes through a membrane due to greater pressure on one side of the membrane
seperation of substances in solution by selectively permeable membranes
Physiological (active) process?
requires energy expenditure from the cellin the form of ATP- solutes moving against or up the concentration gradient
Active transport?
protein carriers bring molecules in, ex: Na+/K+ pump
Solute pumping?
bring in molecules against diffusion pressure and ion concentration