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“Cell Environment” Notesp. 394 “Cell Environment” Notes
Selectively permeableSome things can pass through the cell membrane & some can’t
Ways of moving through a cell membrane:Passive transport – no energy needed Active transport – needs energy
Diffusion Passive Molecules move from an area of higher concentration to an area of lower concentration
Why diffusion happens Molecules are always movingThey bump into each other Causes them to spread out
Osmosis Diffusion of water Passive
Why can’t people drink large amounts of salt water??Salt water causes water to move out of body cells
Active Transport Move materials through cell membrane, using cellular energy Two types:
1. Transport Proteins “Pick up” outside molecules & bring them insideUses energy Can move things in or out of cell
2. Engulfing Cell membrane surrounds & engulfs a particleForms a vacuole with the particle inside Uses energy
Why are cells small? Materials must be able to flow through cytoplasm and reach their destination Keep travel time low! If cell grew too large, it could not function well enough to survive.
Moving Cellular Materials
Substances cross the cell membrane without the cell expending energy
DIFFUSION & OSMOSIS.
Material Flow in the Cell
Biology: Cell Bingo Protects the cell and regulates what comes in and out Cell Membrane.
How do things move in and out of cells?
The Cell in its Environment The Cell Membrane. What do you think? Look at the pictures of the various types of cells. Do you think all cells have the.
The Cell in its Environment The Cell Membrane stars in:
Movin Movin’ On Out Molecules in Motion. The Gatekeeper Cell membrane Selectively permeable.
Warm-Up Compare the function of the cell wall and the cell membrane in plant and animal cells. Describe the characteristics and role of the nucleus. What.
Moving Cellular Materials Pg
Passive Transport. Healthy Cell 70% water 15% protein 10% fat 4% DNA and other materials 1% carbohydrate.
Cell Transport The movement of molecules can be either passive (no energy) or active (needs energy) depending upon the membrane structure and concentration.
Osmosis and Diffusion Semi-Permeable membrane – allows some things through and keeps other things out (Also called selectively permeable)
What elements make up proteins?
The Cell and it’s Environment Section 4 of chapter 1-”C” pages 32-36
Passive Transport Guiding Questions Answers
Lesson Overview 7.3 Cell Transport.
CELL TRANSPORT What is it?. Definition: Cell Transport is moving materials into, out of, or within the cell Cell Transport is moving materials into, out.
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