Chapter 5.5 Cellular Transport Flashcards
Define diffusion.
Particles tend to move from an area where they are more concentrated to an area less concentrated.
What is passive transport?
Movement of substances across cell membranes without requiring the use of energy.
Define osmosis.
Diffusion of water across selectively permeable membrane.
What does osmosis enable?
Homeostasis
What are the three different types of solutions that affect osmosis?
Isotonic, hypertonic, hypotonic
What is facilitated diffusion?
Molecules that cannot diffuse on their own, move through protein channel
What is active transport?
Transport protein (carrier) protein requirs energy to help move particles across the membrane against a force.
What is another name for the force that requires active transport?
Concentration gradient
Define endocytosis.
Large particles are engulfed, then enclosed by cell membrane - moves into cell
Define what exocytosis.
Large particles are released from cell by Secreting them or expelling them out.
What are two examples of active transport?
Endocytosis
Exocytosis
What is homeostasis?
The ability of a cell membrane to regulate the cells internal environment.
In diffusion, solute moves from a ______ concentration to a _______ concentration.
From a high concentration to a low concentration
In osmosis, water moves from a _______ concnetration to a ______ concentration.
From a high concentration to a low concentration.
Describe isotonic.
The concentration of solutes is the same on both sides of the selectively permeable membrane. EQUILIBRIUM
