Hand in W'S' Homeostasis and transport before the bell rings

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Class Topics
Title Biology 11/10/06
Objectives

• To complete the eggsperiment, assess knowledge
  gained about passive transport and learn about
  active transport.

• Hand in W.S. Homeostasis and transport before
  the bell rings
• Please do not hand in the lab Eggsperiment
• Chapter 4 Quiz 1
• Notes Chapter 4
• Active Transport
• Mans mind stretched to a new idea never goes
  back to its original dimensions.
• Oliver Wendell Holmes

Friday, December 25, 2009 420 PM
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Miscellaneous

• Do not assume I will be available for help after
  school
• Before school I will still be available
• If Im not in my room, check other places!
• I will be available during homeroom
• Check with me about after school time
• Review times can be arranged ahead of time

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Eggsperiment

• Determine a range for the percentage of water and
  the percentage of solute in your egg.
• Explain how you determined this
• Write a description of how you could find the
  exact percentage of water and solute in your egg.
• Hand in the Eggsperiment

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Class Assignments
By When
What

• Eggsperiment 11/10/06
• W.S. Homeostasis and transport 11/10/06
• Chapter 4 Quiz 1 11/10/06
• W.S. 4.2 (DR/Quiz) 11/14/06
• Due this class period
• Due next class period
• Due in the future

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Grade Sheet
1A SR p. 61 - 5 pts Measurement W.S. 10 pts
3A SR p. 42 6 pts
4A SR p. 47 5 pts
2A Measurement W.S. 10 pts
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Postquiz Activities

• Hand in quiz
• Pick up Active Transport handout
• Read 81-86

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Ion Channels(a type of facilitated diffusion)

• Transport proteins have polar channels for the
  important ions to pass
• Na, K, Ca2, and Cl-
• Fig 3
• Used in maintaining electrical charge or nerve
  cells

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Active Transport

• Using energy to move particles across the cell
  membrane - through an transport protein (pump)
• Usually against the concentration gradient - like
  going up a hill
• Ex. glucose into liver and muscle cells for
  storage
• from a low concentration in the bloodstream to a
  high concentration in the cells

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Sodium-Potassium Pumpfigure 5

• Found in nerve cells
• Pumps 3 Na out of the cell and 2 K into the
  cell
• Both against their concentration gradient

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From http//www.accessexcellence.org/RC/VL/GG/pas
sActiveTrans.html
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Bulk Transport

• Also known as cytosis
• Uses cell energy (active transport)
• Moving large particles - larger than integral
  proteins - into or out of the cell
• Endocytosis into the cell
• Exocytosis- out of the cell

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From http//www.emc.maricopa.edu/faculty/farabee/
BIOBK/BioBooktransp.html
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Exocytosis

• Excretion
• release waste
• Secretion
• release products
• enzymes, carbohydrates, or hormones made by the
  cell

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Membrane Receptor Proteins

• Signal molecules bind to receptor proteins and
  causes a change in the cell
• Changes in permeability
• Open ion channel
• Second messengers
• Activates another protein inside the cell
• Enzyme action
• Speeds up a reaction (heroin)

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