Osmosis. Overview The plasma membrane is the boundary that separates the living cell from its...

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Osmosis

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Transcript of Osmosis. Overview The plasma membrane is the boundary that separates the living cell from its...

Page 1: Osmosis. Overview The plasma membrane is the boundary that separates the living cell from its surroundings – It controls what goes in and what goes out.

Osmosis

Page 2: Osmosis. Overview The plasma membrane is the boundary that separates the living cell from its surroundings – It controls what goes in and what goes out.

Overview

• The plasma membrane is the boundary that separates the living cell from its surroundings– It controls what goes in and what goes out• Regulates molecular traffic

– The plasma membrane is a selective barrier, allowing some substances to cross it more easily than others

Page 3: Osmosis. Overview The plasma membrane is the boundary that separates the living cell from its surroundings – It controls what goes in and what goes out.

Effects of Osmosis on Water Balance

• Osmosis is the diffusion of water across a selectively permeable membrane– Water diffuses across a

membrane from the region of lower solute concentration to the region of higher solute concentration

Page 4: Osmosis. Overview The plasma membrane is the boundary that separates the living cell from its surroundings – It controls what goes in and what goes out.

Water Balance of Cells Without Walls

• Tonicity is the ability of a solution to cause a cell to gain or lose water– Isotonic solution: Solute concentration is the same

as that inside the cell; no net water movement across the plasma membrane

– Hypertonic solution: Solute concentration is greater than that inside the cell; cell loses water

– Hypotonic solution: Solute concentration is less than that inside the cell; cell gains water

Page 5: Osmosis. Overview The plasma membrane is the boundary that separates the living cell from its surroundings – It controls what goes in and what goes out.

Hypotonic solution

(a) Animal cell

(b) Plant cell

H2O

Lysed

H2O

Turgid (normal)

H2O

H2O

H2O

H2O

Normal

Isotonic solution

Flaccid

H2O

H2O

Shriveled

Plasmolyzed

Hypertonic solution

Page 6: Osmosis. Overview The plasma membrane is the boundary that separates the living cell from its surroundings – It controls what goes in and what goes out.

Water Balance of Cells with Walls

• Cell walls help maintain water balance• A plant cell in a hypotonic solution swells until

the wall opposes uptake; the cell is now turgid (firm)

• If a plant cell and its surroundings are isotonic, there is no net movement of water into the cell; the cell becomes flaccid (limp), and the plant may wilt

Page 7: Osmosis. Overview The plasma membrane is the boundary that separates the living cell from its surroundings – It controls what goes in and what goes out.

Video: Plasmolysis

Video: Turgid Elodea

• In a hypertonic environment, plant cells lose water; eventually, the membrane pulls away from the wall, a usually lethal effect called plasmolysis


Chapter 3. Encloses the cell and forms a boundary Separates the interior of the cell from its surroundings Interior is filled with cytoplasm

Chapter 3. Encloses the cell and forms a boundary Separates the interior of the cell from its surroundings Interior is filled with cytoplasm

The Cell Membrane AP Chapter 7. Overview: Life at the Edge The plasma membrane is the boundary that separates the living cell from its surroundings.

The Cell Membrane AP Chapter 7. Overview: Life at the Edge The plasma membrane is the boundary that separates the living cell from its surroundings.

The Cell Membrane Overview Cell membrane separates living cell from nonliving surroundings thin barrier = 8nm thick Controls traffic in & out of.

The Cell Membrane Overview Cell membrane separates living cell from nonliving surroundings thin barrier = 8nm thick Controls traffic in & out of.

Chapter 7: The Cell Membrane. Overview: Life at the Edge Plasma membrane- the boundary that separates the living cell from its surroundings The plasma.

Chapter 7: The Cell Membrane. Overview: Life at the Edge Plasma membrane- the boundary that separates the living cell from its surroundings The plasma.

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I. Plasma Membrane Structure Plasma membrane – Boundary that separates living cells from their nonliving surroundings. - Apprx. 8 nm thick - Composed chiefly.

All cells have a plasma membrane. This outermost, double-layered membrane separates a cell’s interior from its surroundings. The plasma membrane is selectively.

All cells have a plasma membrane. This outermost, double-layered membrane separates a cell’s interior from its surroundings. The plasma membrane is selectively.

Chapter 7 Membrane Structure and Function. Overview: Life at the Edge The plasma membrane is the boundary that separates the living cell from its surroundings.

Chapter 7 Membrane Structure and Function. Overview: Life at the Edge The plasma membrane is the boundary that separates the living cell from its surroundings.

Life at the Edge The plasma membrane is the boundary that separates the living cell from its nonliving surroundings The plasma membrane exhibits selective.

Life at the Edge The plasma membrane is the boundary that separates the living cell from its nonliving surroundings The plasma membrane exhibits selective.

Chapter 8 Cell Membranes - JU Medicine · 2019-09-30 · Life at the Edge The plasma membrane is the boundary that separates the living cell from its surroundings The plasma membrane

Chapter 8 Cell Membranes - JU Medicine · 2019-09-30 · Life at the Edge The plasma membrane is the boundary that separates the living cell from its surroundings The plasma membrane

AP Biology The Cell Membrane AP Biology Overview Cell membrane separates living cell from nonliving surroundings thin barrier = 8nm thick (1 mm=

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AP Biology The Cell Membrane AP Biology Overview The cell membrane separates the inside of a living cell from its surroundings Function to maintain.

AP Biology The Cell Membrane AP Biology Overview The cell membrane separates the inside of a living cell from its surroundings Function to maintain.

Notes on Membrane Structure and Function. The plasma membrane separates the living cell from its nonliving surroundings this thin barrier controls traffic.

Notes on Membrane Structure and Function. The plasma membrane separates the living cell from its nonliving surroundings this thin barrier controls traffic.

Plasma Membrane Rap. The plasma membrane is the boundary that separates the living cell from its surroundings The plasma membrane exhibits selective permeability,

Plasma Membrane Rap. The plasma membrane is the boundary that separates the living cell from its surroundings The plasma membrane exhibits selective permeability,

Chap 7…. The plasma membrane is the boundary that separates the living cell from its surroundings The plasma membrane exhibits selective permeability,

Chap 7…. The plasma membrane is the boundary that separates the living cell from its surroundings The plasma membrane exhibits selective permeability,

AP Biology 2007-2008 The Cell Membrane AP Biology Overview Cell membrane separates living cell from nonliving surroundings thin barrier = 8nm thick Controls.

AP Biology 2007-2008 The Cell Membrane AP Biology Overview Cell membrane separates living cell from nonliving surroundings thin barrier = 8nm thick Controls.

Membrane Structure and Function. Membrane Structure Plasma membrane is a boundary that separates the living cell from it’s non-living surroundings.

Membrane Structure and Function. Membrane Structure Plasma membrane is a boundary that separates the living cell from it’s non-living surroundings.

Ch. 7 Membrane Structure and Function. Overview: Life at the Edge The plasma membrane – the boundary that separates the living cell from its surroundings.

Ch. 7 Membrane Structure and Function. Overview: Life at the Edge The plasma membrane – the boundary that separates the living cell from its surroundings.

The Cell Membrane & Passive Transport. The cell membrane is the boundary that separates the living cell from its surroundings Life has an inside and an.

The Cell Membrane & Passive Transport. The cell membrane is the boundary that separates the living cell from its surroundings Life has an inside and an.