Study Guide 6.3 Flashcards
What is simple diffusion?
The movement of solute from an area of high concentration to an area of low concentration.
What is osmosis?
The diffusion of water across a membrane.
What is facilitated diffusion?
The passive movement of molecules along the concentration gradient. Carrier proteins help molecules cross the cell membrane.
Please explain hypertonic.
The area with the higher concentration of solute.
Please explain isotonic.
Equal, or the same solute concentration.
Please explain hypotonic.
The area with the lower concentration of solute.
What are endocytosis and exosytosis?
*Enocytosis - Helps molecules enter the cell membrane.
*Exocytosis - Helps molecules exit the cell membrane.
What is active transport?
Transfers the solute from one side of the membrane to the other: Low concentration to high concentration. Has to take care of ATP. “Pump.”
What is the importance of the surface area: volume ratio?
As a cell increases, so does the surface area: volume ratio. When there is insufficient surface area to support the volume, then the cell can divide or pass away.
Please compare and contrast the different types of transport.
Please predict which way salt and sugar will diffuse across a membrane.
From higher concentration to lower concentration, or down.
Please predict which way water will diffuse across a membrane via osmosis.
From higher concentration to lower concentration, or down.
