Osmosis and Diffusion DIFFUSION The movement of molecules

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Osmosis and Diffusion

Osmosis and Diffusion

DIFFUSION The movement of molecules from a high concentration of solutes to an area

DIFFUSION The movement of molecules from a high concentration of solutes to an area of lower concentration

HOMEOSTASIS The ability of the body to maintain internal stability when dealing with external

HOMEOSTASIS The ability of the body to maintain internal stability when dealing with external changes

They do too! Fish have to maintain homeostasis for varying solute/salinities open ocean, brackish

They do too! Fish have to maintain homeostasis for varying solute/salinities open ocean, brackish water (where rivers meet seawater, aka estuaries) and freshwater ESTUARY

Osmosis animation Osmosis: diffusion of water through a selectively permeable membrane Water will always

Osmosis animation Osmosis: diffusion of water through a selectively permeable membrane Water will always flow TOWARD higher concentrations to dilute it (maintain homeostasis) • Water moves freely through pores. • Solute (green) too large to move across.

TONICITY Hypertonic Hypotonic Isotonic

TONICITY Hypertonic Hypotonic Isotonic

Hypotonic Solution • Osmosis Animations for isotonic, hypertonic, and hypotonic solutions Hypotonic: The solution

Hypotonic Solution • Osmosis Animations for isotonic, hypertonic, and hypotonic solutions Hypotonic: The solution has a lower concentration of solutes than inside the cell. Result: Water moves from the solution to inside the cell): Cell Swells and bursts open (cytolysis)!

Hypertonic Solution • Osmosis Animations for isotonic, hypertonic, and hypotonic solutions Hypertonic: The solution

Hypertonic Solution • Osmosis Animations for isotonic, hypertonic, and hypotonic solutions Hypertonic: The solution has a higher concentration of solutes than inside the cell. shrinks Result: Water moves from inside the cell, to the solution: Cell shrinks (Plasmolysis)!

• Isotonic Solution Osmosis Animations for isotonic, hypertonic, and hypotonic solutions Isotonic: The

• Isotonic Solution Osmosis Animations for isotonic, hypertonic, and hypotonic solutions Isotonic: The concentration of solutes in the solution is equal to the concentration of solutes inside the cell. Result: Water moves equally in both directions and the cell remains same size! (Dynamic Equilibrium)

What type of solution are these cells in? A Hypertonic B C Isotonic Hypotonic

What type of solution are these cells in? A Hypertonic B C Isotonic Hypotonic

Osmoregulation: Marine Fish Marine fish have blood LESS salty than seawater they will LOSE

Osmoregulation: Marine Fish Marine fish have blood LESS salty than seawater they will LOSE water through osmosis Replace lost water by drinking seawater Excrete low amounts of SALTY urine/through gills

Osmoregulation: Freshwater Fish Blood is more salty than the freshwater they live in Water

Osmoregulation: Freshwater Fish Blood is more salty than the freshwater they live in Water diffuses INTO the body Must release large amounts of dilute urine Absorb salts by the gills

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