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5.2 Active Transport
Page 100
Standards
• CLE 3210.1.5 - Compare different models to
explain the movement of materials into and out
of the cell.
• SPI 3210.1.8 - Compare active and passive
transport.
• RLE 2010.2.1 - Recognize the importance of
homeostasis as a survival mechanism.
Active Transport
• Active Transport:
Requires the use of energy.
• Why does it use energy?
Energy is required to move something from an
area of low concentration to an area of high
concentration.
• Example:
The paramecium moving water out of it’s cell.
Cell Membrane Pumps
• Transport Proteins:
Some transport proteins can move material from
low concentration to high concentration. They are
called “pumps.”
• Example:
Sodium Potassium Pump.
Sodium Potassium Pump - Page 104
Vesicles:
Active transport for large molecules
• Endocytosis:
the process by which a cell membrane surrounds a
particle and encloses the particle in a vesicle to
bring the particle into the cell
• Exocytosis:
he process by which a substance is released from
the cell through a vesicle that transports the
substance to the cell surface and then fuses with
the membrane to let the substance out
Endocytosis
• Three Types of Endocytosis:
– Pinocytosis
The movement of fluids and small molecules into the
cell in vesicles.
– Phagocytosis
The movement of large particles or whole cells into
the cell in vesicles.
– Receptor-mediated endocytosis (not in your book)
When particles bind to receptor proteins it causes
the cell to pull the bound particles into the cell.
Exocytosis
• Exocytosis:
the process by which a substance is released from
the cell through a vesicle that transports the
substance to the cell surface and then fuses with
the membrane to let the substance out
• What gets exported this way?
Any molecules packaged by the Golgi Apparatus
and waste products.
• In paramecium
Review
• Active Transport – Three main types:
– “Protein Pumps” move things from low to
high concentration.
– Endocytosis – moving things into cell
• Pinocytosis
• Phagocytosis
– Exocytosis – moving things out of the cell