Essential Question: How do the structures you observed connect to what that specific cell does?

Transcription

1 Writing up summary of cell observations Essential Question: How do the structures you observed connect to what that specific cell does? How does Juliet maintain a constant body temperature? Romeostasis 10/27/14 Write up summary on separate paper. Turn in with rubric on TUESDAY.

2 Due tomorrow Use your list on page 27 to help write 3 paragraphs (one for each type of cell) that connect what you saw (structures) with what the cell does (function). Use rubric as a guide. If you are done, you should re-read section 3.3 about Cell Membrane and read section 3.4 about diffusion and osmosis.

3 Topic: Passive Transport In/Out of Cell Turn in Summaries Essential Question: How does material move in and out of cells without using energy? 42.7 percent of all statistics are made up on the spot. - Steven Wright 10/28/14 INB p

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5 Interacting with the environment is extremely important for organisms. And since the basic unit of life is a CELL, all the important action is happening at the cellular level. Mainly involving the cell membrane. There are several different processes involved and we will spend the next few classes looking at them.

6 On p. 25 of INB, you have a) Labeled diagram of phospholipid b) Labeled diagram of cell membrane c) Summary of how the structure of the membrane helps it carry out its function (this had better include water-loving and waterhating parts)

7 On page 24- Compare the heads and tails of phospholipids and contribute to the role of phospholipids in the cell membrane. You may use some of the terms below in your statements. sandwich filling HEADS TAILS polar inside bi-layer Phospholipids non-polar outside sandwich bread avoid water proteins fluid mosaic attracted to water

8 Compare your diagram with your I partner. Check for accuracy. What ideas do both of you have down? Do you have ideas that disagree? Who is right? Does one partner have a good idea the other did not? Add it.

9 Polar molecule electric charge is spread unevenly

10 Polar molecule electric charge is spread unevenly

11 Nonpolar molecule electric charge is evenly spread

12 Double-fold notes (to be taped on page 29 when done) At the top title notes: Passive Transport Entitle one flap Diffusion and the other Osmosis.

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14 Outside of flap definition & diagram Lift flap, back of flap- examples & pictures Inside will be special terms for each Use at least 4 colors

15 Transport Across the Membrane Cells need certain molecules for processes (water, oxygen) Need to get rid of others (carbon dioxide)

16 Transport Across the Membrane Concentration Gradient

17 Transport Across the Membrane Concentration Gradient

18 Transport Across the Membrane Concentration Gradient

19 Transport Across the Membrane Diffusion movement from high concentration to low concentration

20 Transport Across the Membrane This movement does NOT require energy called passive transport.

21 Diffusion and osmosis are types of passive transport. Molecules diffuse down a concentration gradient Diffusion and Osmosis webvideo.

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23 Some molecules can only diffuse through transport proteins. Some molecules cannot easily diffuse across the cell membrane for example they may be electrically charged. Facilitated diffusion is diffusion through transport proteins. Still is diffusion (no energy required).

24 Passive transport does not require energy input from a cell. Molecules can move across the cell membrane through passive transport. There are two types of passive transport. diffusion osmosis

25 OK, next How can a person die of dehydration floating in the ocean? Why do doctors tell you to gargle with salt water if you have a sore throat? These both involve a process called OSMOSIS.

26 Diffusion and osmosis are types of passive transport. Osmosis is the diffusion of water molecules across a semi-permeable membrane.

27 Osmosis inside foldable HYPERTONIC (relative to the cell) ISOTONIC (relative to the cell) HYPOTONIC (relative to the cell)

28 There are three types of solutions. isotonic hypertonic hypotonic

29 Onion Cells in Salt Water Cell Wall Space outside cell, but inside cell wall. Cell membrane Cytoplasm

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