Passive/Active Transport Flashcards
Passive Transport
Cells spend no energy (adenosine troposphere) to move molecules
In which direction does passive transport occur
Molecules move from a high concentration to low concentration
- Down their concentration gradient
Types of Passive Transport
Diffusion, osmosis and facilitated diffusion
Diffusion
Movement of molecules from an area of high concentration to low, movement continues until equilibrium is reached
Osmosis
diffusion of water through a selectively permeable membrane from a less concentrated solution to a higher concentration solution
Distilled water
100% pure water (no solutes)
Hypotonic environment, low solutes
Salt Water
High solutes (namely salt)
Hypertonic environment (high solutes)
Facilitated diffusion
Larger molecules enter or exit with the help of protein channels in the plasma membrane.
Concentration gradient
Water moves from where there is more water (low solute) to where there is less water (high solute)
Active Transport
Molecules move from a low to high concentration with the use of energy (ATP)
Endocytosis
process in which the plasma membrane takes in substances
Phagocytosis
when a cell engulfs a solid particle
Pinocytosis
when a cell engulfs a liquid particle
Exocytosis
process when substances are expelled from the cell, proteins and nutrients and waste exit through exocytosis
