Ch. 5 Cell Membrane and Transport. LIPID BILAYER. cytoplasm. extracellular fluid. Cell Membrane —thin, flexible membrane that surrounds all cells. . Selectively permeable - regulates what enters and exits the cell. Made up of a phospholipid bilayer . Double layer of phospholipids
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Water (outside of cell)
Water (inside of cell)
Fibers of extracellular matrix
Carbohydrate (of glycolipid)
Microfilaments of cytoskeleton
Cell Transport: movement of substances across the cell membrane based on concentration gradient.
Concentration Gradient: Difference in concentration over a distance.
Isotonic Solution—Concentration of solutes is equal in and out of the cell.
Hypertonic Solutions—Concentration of solutesis higher outside the cell.
D. Hypotonic Solution—Concentration of solutes is lower outside the cell.
1. Water enters the cell.
2. Animal cell swells and
may burst which is known as Cytolysis.
3. Plant cell—cell wall prevents breaking. (Turgor Pressure)
Have evolved to have kidneys and gills that constant work to flush water out of the body
1 liter of
Fig. 5.14, p. 88
-low to high concentration
Can not digest FAT
Fat builds up and destroys his nerves
Fat enters body in 2 ways – food and biosynthesis
Oil stops biosynthesis!
Oil keeps the body from building up the bad fat