CELL TRANSPORT
EOI REVIEW
From Luv Dailey with modifications by
Tamara Lookabaugh
Cell Transport through MEMBRANES
PASSIVE Transport
• (no extra energy required)
• Molecules move from an
area of HIGH to LOW
concentration
• Examples are:
Osmosis
Diffusion
Facilitated Diffusion
ACTIVE Transport
• (ENERGY required)
• Molecules move from an
area of LOW to HIGH
concentration
• Examples are:
Exocytosis
Endocytosis
Protein PUMPS
Cell Transport - Video Overview
• Diffusion- movement of molecule from an area of [H] -> [L]
• passive transport: no energy required
• Can be liquid or gas
Cell Transport - Osmosis Video
• Osmosis- movement of H2O from an area of [H] -> [L]
• passive transport: no energy required
• water
Cell Transport – Molecule Concentration in solution
• Hypertonic
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Hyper= more
More solute /less water in the solution than in the cell
Water leaves cell
Cell will shrink
Cell Transport
• Hypotonic Solution
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•
•
•
Hypo= less
Less solute /more water in the solution than in the cell
Water moves into the cell
Cell could burst
Cell Transport
• Isotonic Solution
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•
•
•
Iso= same
Equal solute and water in the solution and the cell
Water moves into the cell and out of cell equally
Cell is at equilibrium
Cell Transport Video Facilitated diffusion
• Facilitated Diffusion- movement of larger
molecules from [H] -> [L]
• passive transport: no energy required
Cell Transport - ACTIVE TRANSPORT VIDEO
• Active transport: is the movement
of molecules across a cell membrane in the
direction against their concentration gradient,
[L] -> [H]
• requires ATP (energy)
• Modifies protein (changes shape)
Examples are ENDOCYTOSIS, EXOCYTOSIS and PROTEIN
PUMPS
AMOEBA SISTERS REVIEW
Watch this video for a short overview of CELL TRANSPORT
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D
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Use the information to answer questions 4-6.
A biology student wants to study how animal cells react when places in distilled water and in a salt solution. The
student used the following procedure:
1) Place a small sample of cells on a microscope slide and place a cover
slip over the sample. Add a few drops of distilled water under the cover
slip.
2) Observe the cells in the distilled water solution under a microscope.
3) Place a small sample of cells on a microscope slide and place a cover
slip over the sample. Add a few drops of 20% salt solution under the cover slip.
4) Observe the cells in the salt solution under a microscope.
12.
What is the dependent variable in this experiment?
A the salt concentration
B the number of cells in the sample
C the type of animal that the cells come from
D the movement of water across the cell membrane
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A
B
C
D
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