Unit 3 Flashcards
basic structures and functions of cells
nucleus
control center, largest structure, DNA and RNA
nucleolus
makes ribosomes
Cytoplasm
holds all organelles, large carbs, fats, and protein molecules
cytosol
semi-fluid, 75%-95% of water
cell membrane
what comes in and out of cell, phospholipidbilary
selectively permeable membrane
cell membrane function, flexible boundary, mediates entrance/exit of material into and out of cell.
facts affect selective permeability(4)
size of molecules
solubility in lipids
charge on ions
presence of carrier molecules
Intracellular fluid
fluid INSIDE the cell
Extracellular fluid
fluid found in microscopic spaces between cells
(ex: plasma/spinal fluid)
interstitials
between tissues
intercellular
between cells
passive transport processes
diffusion
facilitated diffusion
osmosis
dialysis
filtration
diffusion
movement of molecules from high to low concentration (no energy required)
facilitated diffusion
high to low concentration through protein channels of cell membrane
dialysis
diffusion of waste, excessive particles and water
Filtration
removing particles from solution by allowing liquid and substances that are smaller.
osmosis
diffusion of water
Active transport processes
endocytosis
exocytosis
active transport
Endocytosis
molecules are too big to enter cell, vesicle is formed or “cell eating”
Exocytosis
remaining particles from cell
Active Transport
ions move against concentration
isotonic solution
equal
hypotonic solution
low/more particles in cell
hypertonic solution
high/ more particles in water
