Cell Transport chap. 7-3
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Transcript of Cell Transport chap. 7-3
Cell TransportCell Transportchap. 7-3chap. 7-3
https://www.pinterest.com/pin/225039312606126463/
I. Cell MembraneI. Cell Membrane1) POLAR ends face INSIDE & OUTSIDE cell [where water is]
2) NONPOLAR tails face each other inside bilayer [to avoid water]
Outsideof cell
Insideof cell(cytoplasm)
Cellmembrane
Proteins
Proteinchannel
Lipid bilayer
Carbohydratechains
http://www.bioteach.ubc.ca/Bio-industry/Inex/
3) FUNCTION: SELECTIVE PERMEABILITY = allows only certain materials to go into & out of cell
a. Why doesn’t the cell membrane let everything through?
HOMEOSTASIS!- Cells maintain a stable environment by controlling what enters & leaves.
II. Cellular Transport – Two II. Cellular Transport – Two Major Types (Passive & Major Types (Passive & Active Transport)Active Transport)1.Passive Transport = moves molecules across cell mem. using NO ENERGY
Movement going with the concentration gradient (normal flow)
1.Diffusion – molecules move from HIGH conc. to LOW conc.
a. Small molecules: O2, CO2
b. Slow process
A. Types of Passive Transport
Passive Transport Video Cliphttps://www.pinterest.com/pin/
225039312606104881/
PROBLEM for PROBLEM for Cells?Cells?
Cell Cell membranes membranes areareSELECTIVELY SELECTIVELY PERMEABLEPERMEABLE
2. Facilitated Diffusion – movement of molecules with help of a carrier protein
a.Moves large molecules
like Glucose and Fructose (C6H12O6)
b. Faster than diffusion
http://www.sirinet.net/~jgjohnso/homeostasis.html
3. Osmosis – diffusion of WATER across cell membrane
* H2O moves to area with LESS WATER
a. Direction of Osmosis:1) Hypotonic Solution = H2O moves INTO cell & CELL EXPANDS
2) Hypertonic Solution = H2O moves OUT OF cell & CELL SHRINKS
3) Isotonic Solution = H2O moves INTO & OUT OF cell & cell stays NORMAL SIZE
* EQUILIBRIUM = concentration of molecules is same everywhere
* Molecules never stop moving – even at equilibrium
2. 2nd Type of Transport Active Transport
1. moves molecules across cell membrane using ENERGY
B. Types of Active Transport
1. Transport Proteins: in membrane- move substances from low to high conc. (opposite of how it wants to move)
2. Endocytosis = cell surrounds & ingests materials from OUTSIDE to INSIDE cell using VESICLES
http://www.sirinet.net/~jgjohnso/homeostasis.html
a. Steps:1) membrane folds in & forms pocket2) Pocket closes & pinches off in cell vesicle 3) vesicle fuses w/ organelles to release contents
b. Two Types of Endocytosis:1)Phagocytosis – LARGE particles (food) or whole CELLS (bacteria) into cell
2) Pinocytosis – large amounts of liquids/ fluids into cell
3. Exocytosis –releases large amounts of material to the OUTSIDE of the cell using VESICLES
a. Steps:1)Vesicle forms, travels to & fuses w/ cell mem.
2)Vesicle opens to outside & releases contents
http://www.sirinet.net/~jgjohnso/homeostasis.html
Video clip