Particles Move From Areas of Greater or Higher
- Slides: 34
Particles Move From Areas of Greater or Higher Concentrations to Areas of Lower or Lesser Concentrations This is known as diffusion
HIGH LOW
Animation of How Diffusion Works http: //highered. mcgrawhill. com/sites/0072495855/student_view 0/chapter 2/animation__how_diffusion_ works. html
A Cell Membrane
Membranes control what comes in or out of a cell and maintains a balance in the cell called homeostasis
Membranes are Selectively Permeable or Semi-Permeable Some materials can pass through membranes, but others cannot. Due to the chemical make up of the membrane and the diffusing particles. The size and charge of the particle determine if a membrane will be permeable to the particle.
Animation of Diffusion Through a Semipermeable Membrane http: //zoology. okstate. edu/zoo_lrc/biol 1114/t utorials/Flash/Osmosis_Animation. htm
Some particles diffuse by themselves. Others (ions) have to go through proteins. Others (if they’re too large) will not diffuse at all. MEMBRANES ARE SELECTIVELY PERMEABLE
Diffusion is Important to Cells See what happens to red blood cells if the water and solute concentrations are not equal in blood cells and surrounding plasma! https: //www. youtube. com/watch? v=A 8 c. I 6 Fk c. G 4 c
• The diffusion of water in or out of cells is so important, we have a special term for it – osmosis
Plant Cells Don’t Rupture Due to Osmosis Because of the Cell Wall
https: //www. youtube. com/watch? v=z. Vv. Hn 6 Sj 9 PQ
The pressure of water in the vacuole of plant cells press up against the cell wall and is called turgor (or tugor pressure)
Terms You MUST Know and Understand! Hypertonic – the SOLUTE concentration is high Hypotonic – the SOLUTE concentration is low Isotonic – the SOLUTE concentrations are equal (at equilibrium)
PLANT CELL IN A HYPERTONIC SOLUTION PLANT CELL IN AN ISOTONIC SOLUTION PLANT CELL IN A HYPOTONIC SOLUTION
• You can’t always predict which direction solutes move!!!! • It depends if the cell membrane is permeable to the solute!!!!
Some unicellular organisms that are very hypertonic to their surroundings have a special vacuole, a contractile vacuole that pumps excess water out of the cell. https: //www. youtube. com/watch ? v=pah. Ut 0 RCKYc
• You can always predict which way water will diffuse • Water moves from hyp. Otonic solutions TO hyp. ERtonic solutions
Ions Pass Through Membranes by Using Proteins When particles pass through proteins, this is called facilitated diffusion http: //highered. mcgrawhill. com/sites/0072495855/student_view 0/chapter 2/animation__how_facilitated_ diffusion_works. html
If the Cell Uses Its Own Energy to Transport Materials Through the Cell Membrane, This is
• In active transport, particles are moved from lower to higher concentrations • This is known as going UPHILL or AGAINST the concentration gradient • Protein pumps in the cell membrane are used in active transport
Video on Active Transport https: //www. youtube. com/wat ch? v=2 -ic. EADP 0 J 4
• When cells do not use their own energy for transport, it’s known as passive diffusion or transport. • Particles are moved down the concentration gradient
Very Large Particles or Groups of Particles are Transported by Vesicles
Large Particles Move Into Cells by Endocytosis and Out by Exocytosis
A Review of Cellular Transport (click on SC, then GO to get this to work) http: //www. classzone. com/cz/books/bio_ 07/resources/htmls/animated_biology/u nit 2/bio_ch 03_0093_ab_cellmem. html
- Definite arrangement
- Plasma to gas
- Cloudy mixture with particles that move erratically
- Particle arrangement of a solid
- What has roads but no cars rivers but no water
- Higher visual areas
- Ions charged particles in solution
- Absolute dependent motion analysis of two particles
- Movement of particles from high to low concentration
- Stokeslaw
- Solid liquid gas particles
- Adverbs of frequency jeopardy
- Kinetics of particles newton's second law
- Finest soil particles
- Relative motion of two particles using translating axes
- What is particles
- Freezing melting evaporation condensation sublimation
- Particles of a solid
- Classification of elementary particles
- Arrangement of subatomic particles
- Atomic structure
- Motion of particles in solids, liquids and gases
- Charged particles can be accelerated by
- What is mutual force
- Subatomic particles table
- Mass of protons
- Dynamics
- What is particle
- Subatomic particles description
- Condensation melting freezing evaporation
- Describe neutrons.location: charge: mass:
- _____ solutions are very unstable.
- Electrophoresis of colloidal solution
- Point like particles
- Chapter 21 temperature, heat and expansion answer key