Osmosis 3.A.10.

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Substances cross the cell membrane without the cell expending energy

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Presentation transcript:

Osmosis 3.A.10

End Drill 1. What structure is common to ALL cell types? Chloroplast Plasma Membrane Cell Wall Mitochondria Flagella 2. The cell membrane is described as ____________ because it allows some substances to cross and restricts others. Permeable Impermeable Semi-permeable Isotonic End

Objective SWBAT (student will be able to) explain how water is transported through the cell by learning about osmosis. End

Agenda Lecture Activity Osmosis Osmosis Lab Isotonic:When solute concentration in the environment is equal to that in the cell. Hypertonic:Solute concentration in the environment is higher than that in the cell. Hypotonic:Solute concentration in the environment is lower than in the cell Activity Osmosis Lab

Osmosis Movement of Water Across Cell Membrane “diffusion of water” Water diffuses when it moves across cell membrane. 2006-2007

Vocabulary

Vocabulary Solute: Substance dissolved (sugar or salt) Solvent: Liquid part (water) Solution: Solute and solvent (salt water)

Osmosis Diffusion across a membrane Involves the movement of water Occurs when one molecule can not move across the membrane In order to reach equilibrium water has to move

Osmosis Osmosis diffusion of water from HIGH concentration of water to LOW concentration of water across a semi-permeable membrane

Water can move…sugar can’t

cluster of water molecules Lower concentration of solute Higher concentration of solute Equal concentration of solute H2O Solute molecule Selectively permeable membrane Water molecule Solute molecule with cluster of water molecules Net flow of water

??? What is a selectively permeable membrane?

??? Cell Membrane Plasma Membrane What is a selectively permeable membrane? The plasma membrane is said to be selectively permeable because it allows the passage of some solutes but not others.e.g.if sugar fits a channel through the plasma membrane.This makes this one of the important properties of the plasma membrane of all cells. Cell Membrane Plasma Membrane Phospholipid Bilayer:Fluid like a soap bubble resulting from pushing and pulling of phospholipids by water.

??? Water moves from an area of _______ water concentration to an area of _____ water concentration

Keeping water balance Cell survival depends on balancing water uptake & water loss freshwater balanced saltwater

Hyper: a lot Hypo: a little Iso: unchanged Tonicity: pressure Vocabulary Hyper: a lot Hypo: a little Iso: unchanged Tonicity: pressure

Water always moves to the “sugar/salt…” Osmosis Water always moves to the “sugar/salt…” Water moves to balance the inside and outside of the cell

Solution Cell High amount of sugar in the solution Hypertonic Solution Solution Cell Low amount of sugar in the cell

Solution Cell High amount of sugar in the solution Hypertonic Solution Solution Cell Low amount of sugar in the cell

Water moves outside of the cell Hypertonic Solution Example: raisins are dried grapes that were put in sugar solution. Water moves outside of the cell

Solution Cell Low amount of sugar in the solution Hypotonic Solution Solution Cell High amount of sugar in the cell

Solution Cell Low amount of sugar in the solution Hypotonic Solution Solution Cell High amount of sugar in the cell

Hypotonic Solution Water moves inside of the cell

Equal ratios in a solution and cell Isotonic Solution Solution Cell

Equal ratios in a solution and cell Isotonic Solution Solution Cell

See page 83 Isotonic solution Hypotonic solution Hypertonic solution H2O H2O H2O H2O Animal cell (1) Normal (2) Lysed (3) Shriveled H2O H2O H2O Plasma membrane H2O Plant cell (4) Flaccid (5) Turgid (6) Shriveled (plasmolyzed) See page 83

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Hypotonic

Hypertonic

Isotonic

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