video ósmosis II

Summary

This video explains what happens to animal and plant cells when they are immersed in different solutions: isotonic, hypertonic, and hypotonic. It details how in an isotonic solution, the cell remains normal, while in a hypertonic solution, the cell shrinks due to water loss (called crenation), and in a hypotonic solution, the cell swells as water enters, potentially bursting (called cytolysis). For plant cells, in an isotonic solution, they become flaccid; in a hypertonic solution, they undergo plasmolysis, where the plasma membrane detaches from the cell wall; and in a hypotonic solution, they experience turgor pressure without bursting, due to the rigid cell wall.

Takeaways

• 😀 The script explains the effects of different solutions on animal and plant cells.
• 😀 Three types of solutions are discussed: isotonic, hypertonic, and hypotonic.
• 😀 An isotonic solution has an equal concentration of solute on both sides of the membrane, maintaining cell shape and function.
• 😀 A hypertonic solution has a higher concentration of solute outside the cell, causing the cell to lose water and dehydrate.
• 😀 A hypotonic solution has a lower concentration of solute outside the cell, causing the cell to take in water and swell.
• 😀 When an animal cell is placed in an isotonic solution, it maintains its normal shape and volume.
• 😀 When an animal cell is placed in a hypertonic solution, it undergoes plasmolysis, where it loses water and shrinks.
• 😀 When an animal cell is placed in a hypotonic solution, it may swell and even burst due to the influx of water.
• 😀 In plant cells, isotonic solutions cause the cell to be flaccid as water intake and loss are balanced.
• 😀 In hypertonic solutions, plant cells experience plasmolysis, where the plasma membrane detaches from the cell wall due to water loss.
• 😀 In hypotonic solutions, plant cells undergo turgor pressure, where the plasma membrane presses against the rigid cell wall, preventing cell rupture.

Q & A

What is an isotonic solution?

An isotonic solution is one where the concentration of solutes is equal on both sides of the cell's semipermeable membrane.

How does an animal cell behave in an isotonic solution?

In an isotonic solution, an animal cell, like a red blood cell, remains normal, as the concentration of solutes inside and outside the cell is balanced.

What is a hypertonic solution?

A hypertonic solution is one where the concentration of solutes outside the cell is higher than inside the cell.

What happens to an animal cell in a hypertonic solution?

In a hypertonic solution, an animal cell loses water and shrinks, a process known as *crenation*.

What is a hypotonic solution?

A hypotonic solution is one where the concentration of solutes outside the cell is lower than inside the cell.

How does an animal cell behave in a hypotonic solution?

In a hypotonic solution, water enters the animal cell, causing it to swell and possibly burst in a process called *lysis*.

How does a plant cell behave in an isotonic solution?

In an isotonic solution, a plant cell remains in a state of equilibrium, with equal water entering and leaving the cell, causing it to be flaccid.

What is plasmolysis in plant cells?

Plasmolysis occurs when a plant cell is in a hypertonic solution, and water moves out of the cell, causing the plasma membrane to pull away from the cell wall.

What is turgor pressure in plant cells?

Turgor pressure is the pressure exerted by the plasma membrane on the rigid cell wall of a plant cell when the cell swells in a hypotonic solution, preventing it from bursting.

What is the main difference in the behavior of animal and plant cells in hypotonic solutions?

While both animal and plant cells swell in a hypotonic solution, animal cells may burst due to lack of a cell wall, whereas plant cells are protected by their rigid cell wall and develop turgor pressure.