Cells Flashcards
What is Pinocytosis?
When a cell shrinks.
What does isotonic mean?
When a cell and its environment have reached equilibrium with water tans solutes.
What does hypotonic?
Water is moving out of a cell or an environment.
What does hypertonic mean?
When water moves into a cell or environment.
What is an ion channel?
An transporter that only allows certain ions to pass through.
What is active transport?
Transport through the cell membrane that requires energy along with transport proteins.
What is diffusion?
The moving of things across a membrane.
What is passive transport?
Transport that does not require energy and no transport proteins. Water and osmosis.
What is equilibrium?
When there is no net movement between a cel, and it’s environment. Cell’s ultimate goal.
What is endocytosis?
When a vacuole takes things into the cell.
What is phagocyte?
Cells that protect the body by ingesting harmful foreign particles, bacteria, and dead or dying cells
What is Turgor Pressure?
Pushes the plasma membrane against the cell wall of plant, bacteria, and fungi cells as well as those protist cells which have cell walls.
What is a concentration gradient?
Solutes moving through a solution from an area of higher number of solutes to an area of lower number of solutes.
What is a vesicle?
A fluid- or air-filled cavity.
What is Plasmolysis?
The process in which cells lose water in a hypertonic solution.
What is osmosis?
Net movement of water molecules through a semi-permeable membrane into a region of higher solute concentration.
What is a contractile vacuole?
An organelle that periodically expands, filling with water, and then contracts, expelling its contents to the cell exterior.
What is phagocytosis?
The process by which a cell often a phagocyte engulfs a solid particle to form an internal vesicle.
What is exocytosis?
When a vesicle expels things from the inside of the cell.
What is the sodium potassium pump?
Transferring 3 Na ions to the outside of the cell in exchange for 2 K ions.
