cell transport Flashcards
what are the 3 types of passive transport?
diffusion, osmosis and facilitated diffusion
what does passive transport mean?
the cells energy does not have to be used
how does diffusion work?
small particles are moved through phospholipid bilayer from a high concentration to a low concentration
what are examples of particles that are transported by diffusion?
water, carbon dioxide, alcohol
how does osmosis work?
the diffusion/movement of water through phospholipid bilayer or aquaporin from a high water concentration to a low water concentration
what are examples of particles that are transported by osmosis?
water
how does facilitated diffusion work?
larger particles entering cell through carrier proteins because they are too large or water soluble
what are examples of particles that are transported by facilitated diffusion?
glucose and amino acids
how does active transport work?
the movement of ions and molecules across a cell membrane from a region of low concentration to a region of high concentration
what are examples of particles that are transported by active trasnport?
certain ions, glucose and amino acids
how does vesicular transport work?
the movement of substances across the cell membrane in membrane bags (vesicles)
what are the two forms of vesicular transport and what do they transport?
endocytosis - coming into cell (cholesterol, iron ions, micro organisms and cell debris)
exocytosis - leaving cell (secretions like mucus and digestive juices)
