Osmosis and Diffusion Concepts

The video tutorial covers three key concepts in physiology: diffusion, osmosis, and tonicity. Diffusion involves the movement of particles from high to low concentration, while osmosis is the movement of water across a semi-permeable membrane from low to high solute concentration. Tonicity refers to the osmotic pressure gradient across a cell membrane, affecting cell volume. Clinical examples illustrate these concepts, such as the use of intravenous therapy to manage blood volume and pressure.

What is the primary driving force behind diffusion?

• Pressure

• Concentration gradient

• Gravity

• Temperature

What role does a semi-permeable membrane play in diffusion?

• It allows only water and small particles to pass

• It allows only large particles to pass

• It blocks all particles from passing

• It allows all particles to pass through

What is osmolarity?

• The number of particles per liter of solution

• The temperature of a solution

• The pressure exerted by a solution

• The volume of a solution

How does water move during osmosis?

• From lower to higher solute concentration

• From higher to lower solute concentration

• From higher to lower temperature

• From lower to higher pressure

What influences osmotic pressure?

• Volume of the solution

• Temperature of the solution

• Particles that cannot cross the membrane

• Particles that can cross the membrane

What happens to red blood cells in a hypertonic solution?

• They swell and burst

• They remain unchanged

• They deflate and shrivel

• They double in size

What is the effect of an isotonic solution on red blood cells?

• Water moves into the cells only

• Water movement is balanced

• Cells burst due to excess water

• Water moves out of the cells only

In a hypotonic solution, what happens to red blood cells?

• They shrink

• They remain the same

• They become rigid

• They swell and may burst

How does intravenous therapy with colloids affect blood volume?

• It increases blood volume

• It causes blood volume to fluctuate

• It has no effect on blood volume

• It decreases blood volume

What happens to water movement when large molecules are added to the bloodstream?

• Water movement stops completely

• Water moves into the intracellular compartment

• Water moves into the extracellular compartment

• Water moves into the intravascular compartment