Cell Membranes and Solutions: Understanding Osmosis and Its Effects

The video tutorial explains the effects of different solutions on cells, focusing on hypotonic, isotonic, and hypertonic solutions. It describes how water molecules move across a semi-permeable membrane, leading to cell expansion in hypotonic solutions, no net movement in isotonic solutions, and cell shrinkage in hypertonic solutions. The tutorial uses visual aids to illustrate these concepts and discusses the implications for living cells, such as red blood cells.

What is the primary function of a semi-permeable membrane in a cell?

• To allow all molecules to pass freely

• To dissolve solute particles

• To block all molecules from passing

• To allow selective molecules to pass

In a hypotonic solution, what is the expected movement of water molecules?

• Water moves into the cell

• No movement of water

• Water moves equally in and out

• Water moves out of the cell

What happens to a cell in a hypotonic solution over time?

• The cell expands and may burst

• The cell remains the same

• The cell becomes rigid

• The cell shrinks

In an isotonic solution, how do water molecules behave?

• They do not move at all

• They move only out of the cell

• They move equally in both directions

• They move only into the cell

What is the characteristic of an isotonic solution?

• Higher solute concentration outside the cell

• No solute present

• Equal solute concentration inside and outside the cell

• Higher solute concentration inside the cell

In a hypertonic solution, what is the direction of water movement?

• Water moves into the cell

• Water moves out of the cell

• No movement of water

• Water moves equally in and out

What effect does a hypertonic solution have on a cell?

• The cell remains unchanged

• The cell shrivels

• The cell becomes more flexible

• The cell expands

How does a red blood cell appear in a hypotonic solution?

• Shriveled

• Normal

• Flattened

• Over-inflated

What is the appearance of a red blood cell in an isotonic solution?

• Shriveled

• Normal with a slight divot

• Flattened

• Over-inflated

What happens to a red blood cell in a hypertonic solution?

• It shrivels

• It bursts

• It remains unchanged

• It becomes over-inflated