Post on 31-Dec-2015
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Movement of Materials In and Out of Cells
Packet #12Chapter #3
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The movement of materials in and out of cells, is important for multiple functions of the cell.
Processes include Diffusion Osmosis Endocytosis
Phagocytosis Pinocytosis
Exocytosis
Introduction
Diffusion
Diffusion I
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The movement of materials in and out of the cell Important process of
bodily function Allows oxygen and
carbon dioxide to enter and leave cells Respiration
Allows simple sugars and fats to enter and leave cells Digestion
Diffusion II
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Regular Diffusion Movement of
substances from an area of high concentration to low concentration
No proteins are used No ATP is used
Adenosine Tri-Phosphate Energy
Diffusion III
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Facilitated Diffusion The movement of
molecules from an area of high concentration to an area of low concentration with the use of a protein. No ATP is used
Diffusion IV
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Active Transport The movement of a
substance from an area of low concentration to an area of high concentration with the use of a protein and ATP
Diffusion VOsmosis
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Osmosis Special type of diffusion The movement of a liquid
solvent from an area of high concentration to an area of low concentration through a semi-permeable membrane. The membrane does not
allow solutes to pass through.
OsmosisHypertonic vs. Hypotonic
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Hypertonic Solution High concentration
of solute Low concentration of
solvent Solvent wants to
enter
Hypotonic Solution Low concentration of
solute High concentration
of solvent Solvent wants to
leave
OsmosisHypertonic vs. Hypotonic
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Phagocytosis, Pinocytosis, Endocytosis and
Exocytosis
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Phagocytosis
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The take up of large particles by cells via vesicles formed in the plasma membrane
The cell invaginates to form a depression in which particles are contained
This then pinches off to form a vacuole White blood cells
Neutrophils Monocytes
Pinocytosis
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The take up of liquids rather than solids Vacuoles are smaller
than those used during phagocytosis
Endocytosis vs. Exocytosis
Both phagocytosis and pinocytosis involve the taking of materials into the cell in bulk. These are examples
of endocytosis The removal of
materials from the cell in bulk is called exocytosis.
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Review
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