Ch 3 Flashcards
Simple Diffusion
Transport of molecules from an area of high concentration to low concentration. Passive process doesn’t require energy.
Osmosis
Transport of water from an area of high concentration to low concentration across the selectively permeable membrane.
isotonic solution
associated with ion concentrations being the same on both sides of the cell membrane.
Active Transport
movement of molecules from low concentration to high concentration (against concentration gradient)
Primary Active Transport
specific transport molecules (proteins) move specific subs across the cell membrane.
Secondary Active Transport
energy stores in Na+ or H+ concentration gradient is used to drive other subs across the membrane against their own concentration gradient.
Symporter
transporter that moves two subs in the same direction.
Antiporter
transporter that moves two subs in the opposite direction.
Vesicular Transport
receptor-mediated endocytosis: movement of specific ligands into a cell by forming a vesicle is formed from the cell membrane.
Phagocytosis
when large subs like virus or bacterium; is a type of Endocytosis
Exocytosis
subs are from the cell after secretory vesicles fuses with the cell membrane
Organelles
specific structures that perform specific functions in the cell.
Ribosomes
sites of protein synthesis
Rough Endoplasmic Reticulum
(going to make protein quaternary)
has ribosomes embedded with it
Smooth Endoplasmic Reticulum
does not have ribosomes
assoc. with fatty acids and steroid synthesis
