Cell Activities Flashcards
What is simple diffusion?
the process by which molecules, atoms, or ions diffuse through a semipermeable membrane down their concentration gradient
What is facilitated diffusion?
a type of passive transport that uses specialized proteins, such as channel proteins and carrier proteins, to help molecules move across a cell membrane
What is osmosis?
the net movement of water across a semipermeable membrane
What does hypertonic mean?
a solution that has a higher concentration of solute than another solution
What does hypotonic mean?
a solution that has a lower concentration of solute than another solution
What does isotonic mean?
the state when two solutions have equal concentration of solutes across a semipermeable membrane
What is active transport?
the molecules are moved across the cell membrane, pumping the molecules against the concentration gradient using ATP
What is endocytosis?
the active process in which a cell forms internal vesicles by invaginating its plasma membrane, allowing the absorption of various molecules and macromolecules from the extracellular fluid.
What is exocytosis?
a process the cell uses to release molecules inside vesicles from the inside of the cell to the environment
If the environment around a cell is hypotonic, which way will the water flow?
Into the cell.
