Cell Tonicity: Exploring Hypertonic, Isotonic, and Hypotonic Solutions

The lecture explains the concepts of hypertonic, isotonic, and hypotonic solutions, focusing on their effects on cells. It describes tonicity as a relative term, comparing solute concentrations between solutions. Hypotonic solutions have lower solute concentration, causing cells to swell and potentially burst. Isotonic solutions have equal solute concentration, maintaining cell stability. Hypertonic solutions have higher solute concentration, leading to cell shrinkage as water moves out.

What does the prefix 'hyper' signify in the context of solutions?

• Less

• Same

• More

• Equal

How is tonicity defined in relation to solutions?

• As a measure of temperature

• As a relative measure compared to another solution

• As an absolute measure of solute concentration

• As a measure of pH level

What happens to a cell when placed in a hypotonic solution?

• The cell shrinks

• The cell remains unchanged

• The cell swells and may burst

• The cell becomes rigid

In a hypotonic solution, where does the water move?

• There is no movement

• It moves in both directions equally

• From the solution to the cell

• From the cell to the solution

What characterizes an isotonic solution?

• No solute present

• Equal solute concentration as the cell

• Lower solute concentration than the cell

• Higher solute concentration than the cell

What is the net movement of water in an isotonic solution?

• Both into and out of the cell

• Out of the cell

• Into the cell

• No net movement

What defines a hypertonic solution?

• It has no solute

• It has more solute than the cell

• It has the same solute concentration as the cell

• It has less solute than the cell

What happens to a cell in a hypertonic solution?

• The cell shrinks

• The cell swells

• The cell remains unchanged

• The cell bursts

In a hypertonic solution, where does the water move?

• There is no movement

• From the cell to the solution

• From the solution to the cell

• It moves in both directions equally

Why does water move out of the cell in a hypertonic solution?

• To increase the solute concentration inside the cell

• To decrease the solute concentration outside the cell

• To balance the solute concentration across the membrane

• To make the cell more rigid