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Watch the animation, then state the process being shown - PowerPoint PPT Presentation


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Watch the animation, then state the process being shown. What process was shown?. What is diffusion?. The movement of substances down a concentration gradient from a region of high concentration to a low concentration. Describe what happened in the animation.

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what is diffusion

What is diffusion?

The movement of substances down a concentration gradient from a region of high concentration to a low concentration

Describe what happened in the animation

slide10

Water molecules

Extracellular space

Cell membrane

Intracellular space

slide11

Extracellular space

Intracellular space

slide12

Extracellular space

Intracellular space

slide13

Extracellular space

Intracellular space

slide14

Extracellular space

Intracellular space

slide15

Extracellular space

Intracellular space

slide16

Extracellular space

Intracellular space

slide17

Extracellular space

Intracellular space

slide18

Extracellular space

Intracellular space

slide19

Extracellular space

Intracellular space

What process was shown?

Describe what happened in the animation

Why did the water molecule use a channel protein and not just cross straight through the lipid bilayer?

what is osmosis

What is osmosis?

The diffusion of water across a selectively permeable membrane from a high concentration to a low concentration

why does diffusion osmosis occur
Why does diffusion/osmosis occur?
  • Organisms must maintain homeostasis and diffusion/osmosis allows cells to receive necessary nutrients and release unwanted waste
why are so many nutrients needed for mammalian cells
Why are so many nutrients needed for mammalian cells?
  • Because mammals have several different cells that perform different tasks and would require different nutrients to perform those tasks
osmosis in an elodea leaf
Osmosis in an Elodea Leaf
  • Elodeais a common freshwater plant that is frequentlyused to decorate aquariums.
  • Freshwater is hypotonic to Elodea and maintains normal osmotic pressure (internal pressure) in the plant. 
  • A hypotonic solution is a solution that contains less (hypo) solutes than the cytoplasm of the cell.
  • Thus, a hypotonic solution has more water than the celland water has a tendency to move (diffuse) into the cell.
  • Plant cells do not rupture because the cell walls resist the outward expansion of the plasma membrane.
slide26

What happens to Elodea in a hypotonic solution?

Osmotic pressure increases because

water enters the cell

osmosis in an elodea leaf1
Osmosis in an Elodea Leaf
  • A hypertonic solution is a solution that contains more (hyper) solutes than the cytoplasm of the cell.
  • Thus, a hypertonic solution has less water than the celland water has a tendency to move (diffuse) out of the cell.
  • Plant cells do not shrivel because the cell walls resist the inward decrease of the plasma membrane.
slide28

What happens to Elodea in a hypertonic solution?

Osmotic pressure decreases because water leaves the cell

slide29

Water will continue to move mostly into or out of a cell until it has reached equilibrium

  • Once the cell has reached equilibrium or homeostasis, water continues to move in both direction
what happens to a red blood cell in an isotonic solution
What happens to a red blood cell in an Isotonic solution?

It means you have an equal amount of solute inside and outside the cell

10% salt

10% salt

Red blood cells

Plant cell

what happens to a red blood cell in a hypotonic solution
What happens to a red blood cell in a Hypotonic solution?

Because there is only a cell membrane the blood cell could burst

10% salt

20% salt

Red blood cells

Plant cell

what happens to a red blood cell in a hypertonic solution
What happens to a red blood cell in a Hypertonic solution?

Red blood cells will shrivel up because the cell membrane does not provide enough support

20% salt

10% salt

Red blood cells

Plant cell

osmosis in paramecium
Osmosis in Paramecium

Paramecia are freshwater protozoa (single-celled eukaryotes) found in pond water

  • Freshwater is hypotonic to Paramecium, and results in the osmotic movement of water into the cell.
  • Specialized organelles called contractile vacuoles function in the homeostatic maintenance of normal osmotic pressure
slide35

Paramecium

Contractile vacuoles

types of diffusion

Types of Diffusion

Passive diffusion and Active diffusion

facilitated diffusion a form of passive diffusion
Facilitated Diffusion a form of Passive Diffusion
  • Movement of molecules such as glucose and water through the cell membrane using channel and carrier proteins
  • Does not require the input of energy
  • Example: osmosis
active transport
Active Transport
  • Movement of material from low concentration to high concentration or against the concentration gradient
  • Requires energy
concentration gradient
concentration gradient

high

high

low

low

With the concentration gradient

Is energy input needed?

Against the concentration gradient

Is energy input needed?

endocytosis phagocytosis
Endocytosis/phagocytosis
  • A type of active transport that moves large amounts of material into the cell
  • Endo= into Cyto= cell
  • Another type of active transport removes large amounts of materials out of the cell
  • Exo= out of Cyto= cell

Exocytosis

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