3 Movement In And Out Of Cells Flashcards
diffusion
the net movement of particles from a region of high concentration to a region of low concentration as a result of their random movement
energy from diffusion comes from
kinetic energy of random movement of molecules and ions
where does diffusion occur in a cell
some substances move into and out of cells by diffusion through the cell membrane
why is diffusion important
allows cells to gain useful substances they require to obtain energy and grow, and lets them get rid of waste products.
osmosis
the net movement of water molecules from a region of high water potentential to a region of lower water potential, through a partially permeable membrane.
what is the role of water as a solvent
helps cells transport and use substances like oxygen or nurtients by having them dissolved in water
how and where does water enter a cell
it enters the cell through the partially permeable membrane by osmosis
how are plants supported by water
plants are supported by the pressure of water inside the cells pressing outwards on the cell wall
turgid
swollen and hard, the cell membrane is pressed against the cell wall
turgor pressure
pressure exerted by fluid in a cell that presses the cell membrane against the cell wall
plasmolysis
the process of contraction or shrinkage of the protoplasm (nucleus + cytoplasm) of a plant cell and is caused due to the loss of water in a cell
flaccid
lacking turgidity, flopy and loose, cell membrane drawn in and pulled away from the cell wall
active transport
movement of particles through a cell membrane from a rgion of lower concentration to a region of higher concentration, using energy from respiration
why does active transport have to happen? (in root hair cells)
Because there is a higher concentration of mineral ions in the root hair cell than there is out.
Why is active transport important
it can move molcules or ions across membranes, including ion uptake by root hairs
