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7.3 Cell Transport
Terms in this set (17)
What is passive transport?
Regulating the movement of molecules from one side of the membrane to another.
The process by which particles move from an area of high concentration to an area of lower concentration.
Movement of the cells across the membrane without using cellular energy.
The process by which molecules that cannot directly diffuse across the membrane pass through special protein channels.
Diffusion of water through a selectively permeable membrane.
Many cells contain water channel protein that allow water to pass right through them.
Isotonic (same strength)
The concentration of solutes is the same inside and out side the cell. Water molecules move equally in both directions.
Hypertonic (above strength)
The solution has a higher concentration than the cell. A net movement of water molecules out of the cell causes it to shrink.
Hypotonic (below strength)
The solution has a lower solute concentration that the cell. A net movement of water molecules into the cell causes it to swell.
Driven by differences in solute concentration, the net movement of water out of or into the cell produces a force known as osmotic pressure.
The movement of materials against a concentration difference is known.
This requires energy.
Small molecules and ions are carried across membranes by proteins in the membrane that act like pumps. Use protein pumps to move potassium, and sodium ions across cell membranes. Changes in shape seem to play an important role in the pumping process.
Larger molecules and even solid clumps of materials can be transported by movements of the cell membrane. This can take several forms, depending on the size and shape of the material moved into or out of the cell.
The process of taking material into the cell by means of infoldings (or pockets) of the cell membrane. The pocket that breaks loose form the outer portion of the cell membrane and forms a vacuole or a vesicle within the cytoplasm.
Type of endocytosis. Extensions of the cytoplasm surround a particle and package it within a food vacuole.
Many cells release large amounts of material. Vacuole surrounding the material fuses with the cell membrane; forcing contents out of the cell.
occurs when cells are placed in a hypertonic solution, they lose water ans shrivel.
This set is often in folders with...
7.1 Life is Cellular
7.4 Homeostasis and Cells
7.2 Assessment Questions
7.2 Cell Structure
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