Cell Membrane Transport Flashcards
Membrane transport is either ________ or ________, depending on whether it requires energy.
ACTIVE
or
PASSIVE
When no energy is needed to move a substance, it is called?
ie. diffusion, osmosis
PASSIVE PROCESSES
When energy is needed to move a substance, it is called?
ie. active transport, transport in vesicles
ACTIVE PROCESSES
What is a difference in the concentration of a chemical from one place to another referred to as?
CONCENTRATION GRADIENT
The passive process of diffusion is described as the movement of molecules across the plasma membrane _______ their concentration gradient.
DOWN
What is it called when both the solvent and the solutes move down their concentration gradients?
DIFFUSION
Across the plasma membrane, molecules can either move straight through, in a process called ________ _________ or go through membrane proteins.
SIMPLE DIFFUSION
What is it called when diffusion has a net movement of a solvent through a selectively permeable membrane?
OSMOSIS
What is the passive movement of water across a selectively permeable plasma membrane from an area of high water concentration to an areas of low water concentration?
OSMOSIS
Osmosis only occurs when a membrane is permeable to _______ and not to certain solutes.
WATER
What is the movement of a substance across a membrane against its concentration gradient called?
ACTIVE TRANSPORT
During active transport __________ is used/needed to ‘pump’ substance in or out of the cell.
ENERGY
Name the active process which occurs in a small spherical sac?
TRANSPORT IN VESICLES
During which active process is extracellular material brought into a cell in a vesicle formed by the plasma membrane?
ENDOCYTOSIS
Name the form of endocytosis in which the cell engulfs large solid particles like bacteria, viruses, and worn-out cells?
PHAGOCYTOSIS
