What is simple diffusion?
Cell Transport

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•
Biology
•
9th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
The process by which molecules move from an area of higher concentration to an area of lower concentration without the need for energy or transport proteins.
2.
FLASHCARD QUESTION
Front
Give an example of simple diffusion.
Back
CO2 and O2 exchange in the lungs.
3.
FLASHCARD QUESTION
Front
What is the function of the sodium-potassium pump?
Back
It is a protein pump that moves 2 K ions into the cell and 3 Na ions out of the cell, helping to maintain the cell's electrochemical gradient.
4.
FLASHCARD QUESTION
Front
Which substance has the most difficulty crossing the cell membrane by diffusion?
Back
Na+ (sodium ions) have the most difficulty due to their charge and size.
5.
FLASHCARD QUESTION
Front
What is dynamic equilibrium in the context of cell transport?
Back
Dynamic equilibrium exists when a substance has equal concentrations inside and outside of the cell, allowing it to move equally into and out of the cell.
6.
FLASHCARD QUESTION
Front
What does it mean when a cell is in a hypertonic solution?
Back
The concentration of solutes outside the cell is higher than inside, causing water to move out of the cell, leading to cell shrinkage.
7.
FLASHCARD QUESTION
Front
What is osmosis?
Back
The diffusion of water molecules across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.
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