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27 Cards in this Set

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  • Back
Passive Transport
Cell uses not energy to move materials into or out of cell.
Substances move from high to low concentration. Moving with the concentration gradient.
The movement of molecules from an area of high to low concentration, due to random movement of molecules (Brownian Movement)
Temperature- one of three factors that affects the rate of diffusion
As temp. increases, molecules move faster and therefore will diffuse faster.
Pressure- one of three factors that affects the rate of diffusion
Increasing pressure forces molecules to diffuse at a faster rate
Concentration- one of three factors that affects the rate of diffusion
The higher the concentration, the faster the molecules will diffuse
The diffusion of water across a selectively permeable membrane from an area of high to an area of low concentration.
Hypotonic Solution- one type of osmosis
Hypo means less. Has less solute but more water than the cells, so the water will diffuse in to the cells, causing it to swell
Hypertonic Solution- one type of osmosis
Hyper means more, Has more solute but less water than the cells, so the water wll diffuse out of the cell, causing the cell to shrink
Isotonic Solution- one type of osmosis
Iso means same, Has the same amount of solute and water as the cell, so there is not net movement of water, water moves in and out at same rate
Facilitated Diffusion
Molecules of substances like amino acids and sugars pass through carrier proteins from high to low concentration
Active Transport
Moves molecules across the plasma membrane from low to high concentration. Move against concentration gradient, energy is required from the cell
Sodium-Potassium Pump- What is it?
Ions of potassium, low conc outside the cell transported in, ions of sodium, lower conc inside cell transported out, actively with carrier proteins
Sodium-Potassium Pump- Rate of transport
For every 3 sodium ions transported out, there are 2 potassium ions transported in
The Active Transport of bulk material into the cell
Known as cellular eating, it is the engulfing of a food particle
Known as cellular drinking. Small indentions are made in the cell membrane, these indentions fll with extracellular material, taken into the cell
The bulk transport of material out of the cell
The release of waste material from a cell
The release of substance from a cell like saliva
Concentration Gradient
Difference in the concentration of a substance across a space
Concentration of a substance is equal throughout a space
Ion Channel
Transport protein through which ions can pass
Carrier Proteins
Protein used to transport specific substances
Receptor Protein
Binds to a signal molecule, enabling thge cell to respond to the signal molecule
Second Messenger
Acts as a signal molecule in the cytoplasm
Turgor Pressure
This is an increase in pressure in the cell, vacuole gets bigger
This is a decrease in pressure in the cell, vacuoles gets smaller