A&P I Lab | Exercise 3a: Diffusion, Osmosis, & Diffusion Rate

The video tutorial by Kevin Tolkoff covers key concepts of cell transport, focusing on diffusion and osmosis. It explains kinetic energy, selectively permeable membranes, and the movement of solutes and water across membranes. The tutorial also discusses different solution types (hypotonic, isotonic, hypertonic) and factors affecting diffusion rates, such as molecular weight, surface area, temperature, and concentration gradients.

What is the role of kinetic energy in cell transport?

• It increases the size of the cell.

• It decreases the temperature of the cell.

• It stops particles from moving.

• It helps particles move across the membrane.

What does a selectively permeable membrane do?

• Selectively allows certain particles to pass through.

• Prevents any particles from passing through.

• Allows all particles to pass through.

• Allows only water to pass through.

How does diffusion occur in terms of concentration?

• From low concentration to high concentration.

• From high concentration to low concentration.

• Only within the cell.

• Only outside the cell.

What is facilitated diffusion?

• Diffusion that occurs only in water.

• Diffusion that requires a protein.

• Diffusion that requires energy.

• Diffusion that stops at equilibrium.

In osmosis, which direction does water move?

• Only out of the cell.

• Towards lower solute concentration.

• Towards higher solute concentration.

• Randomly across the membrane.

What happens to a cell in a hypotonic solution?

• It remains the same.

• It becomes rigid.

• It shrinks.

• It bursts.

What is an isotonic solution?

• A solution with higher solute concentration outside the cell.

• A solution with no solute.

• A solution with lower solute concentration outside the cell.

• A solution with equal solute concentration inside and outside the cell.

How does molecular weight affect diffusion rate?

• Lower weight increases diffusion rate.

• Weight only affects osmosis.

• Weight has no effect on diffusion rate.

• Higher weight increases diffusion rate.

What effect does temperature have on diffusion rate?

• Higher temperature decreases diffusion rate.

• Higher temperature increases diffusion rate.

• Temperature has no effect on diffusion rate.

• Lower temperature increases diffusion rate.

What is the relationship between concentration gradient and diffusion rate?

• Gradient has no effect on diffusion rate.

• Higher gradient increases diffusion rate.

• Lower gradient increases diffusion rate.

• Higher gradient decreases diffusion rate.