u nit 2 s ec 7.3 homeostasis and transport. c ell w all a. structure composed of cellulose...
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UNIT 2 SEC 7.3Homeostasis and Transport
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CELL WALL
A. Structure Composed of cellulose (__________)
Cellulose is a polysaccharide composed of smaller units called _______________ (glucose)
Glucose protects and supports cell
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CELL MEMBRANE
Cell Membrane: Controls what enter and leave cell through
selective permeability Boundary of every cell
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CELL MEMBRANE
A. Membrane Lipids Phospholipid bilayer:
Polar hydrophilic head Nonpolar hydrophobic tail
Steriods: Cholesterol provides strength and stability in
movement
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CELL MEMBRANE
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CELL MEMBRANE
B. Membrane Proteins Integral proteins: embedded in lipid bilayer &
extend from interior exterior of CM
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FLUID MOSAIC MODEL
Phospholipid bilayer acts more like a fluid than a solid
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II. PASSIVE TRANSPORT
Passive Transport: the movement of substances across the cell membrane without the use of energy
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TYPES OF PASSIVE TRANSPORT
Diffusion Osmosis Facilitated Diffusion
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A. DIFFUSION
Diffusion: movement of molecules from an area of _______ concentration to an area of ________________
Molecules that use Diffusion:1. _________________2. _________________3. _________________ Cool Science Trick
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A. DIFFUSION
Equilibrium: concentration of substances in an area is _______
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B. OSMOSIS
Osmosis: diffusion of ________ molecules across CM from area of _______ concentration to an area of ________ concentration
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WHO GETS IT?
1) What is diffusion?2) What is equilibrium?3) What is osmosis?
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B. OSMOSIS
Direction of Osmosis: Hypotonic: Concentration of solute is lower
outside the cell Hypertonic: Concentration of solute is higher
outside the cell Isotonic: solutes in and outside the cell are equal
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B. OSMOSIS
How cells deal w/ Osmosis: Hypotonic Environment: Plant root cells like this
Cytolysis: Hypertonic Environment.:
Plasmolysis:
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C. FACILITATED DIFFUSION
Facilitated Diffusion: substances require a ____________ for transport b/c it cannot diffuse through membrane
Molecules that use Facilitation Diffusion1. ________________2. ________________3. ________________
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D. FACILITATED DIFFUSION
Protein Channel: pathway for specific ion to pass through cell membrane
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III. ACTIVE TRANSPORT (AT)
1) AT: movement of materials from a area of ______ concentration to a _______ concentration using energy
2) Commonly used fora) _________________b) _________________c) _________________
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III. ACTIVE TRANSPORT
3) Bulk Transport:Used to transport macromolecules or a
large quantity of substanceA) Endocytosis: a cell will engulf external substances into cell
-2 Types 1) Pinocytosis: cell ___________2) Phagocytosis: cell __________
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ENDOCYTOSIS AND EXOCYTOSIS
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III. ACTIVE TRANSPORT
B) Exocytosis: process to remove materials from cell