Osmolarity and Osmoregulation Quiz

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Questions and Answers

What does osmolarity measure?

  • The volume of water in a solution
  • The pressure exerted by water on a membrane
  • The amount of solute per liter of solution (correct)
  • The concentration of ions in a solution

In osmoregulation, what does the extracellular fluid of a multicellular organism include?

  • Ions and molecules
  • Intracellular proteins
  • Interstitial fluid and blood (correct)
  • Aquaporins

What is the main factor that determines the direction of passive water movement in osmosis?

  • The concentration of solute (correct)
  • The presence of aquaporins
  • The size of the water molecules
  • The temperature of the solution

What is the primary function of aquaporins in osmosis?

<p>Facilitate the diffusion of water (A)</p> Signup and view all the answers

What is the role of osmoregulation in living things?

<p>Control water and ion balance (C)</p> Signup and view all the answers

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Study Notes

Osmolarity and Osmoregulation

  • Osmolarity measures the concentration of solutes in a solution.

Osmoregulation in Multicellular Organisms

  • The extracellular fluid of a multicellular organism includes blood plasma, lymph, and interstitial fluid.

Osmosis

  • The main factor that determines the direction of passive water movement in osmosis is the concentration of solutes.
  • In osmosis, water moves from an area of high concentration to an area of low concentration.

Aquaporins

  • The primary function of aquaporins in osmosis is to facilitate the transport of water molecules across cell membranes.

Importance of Osmoregulation

  • The role of osmoregulation in living things is to maintain proper cellular osmotic balance, which is essential for cellular functions and overall health.

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