The cell membrane
Terms in this set (68)
What does the cell membrane do?
controls what goes in and out of the cell done to maintain a homeostasis (stable enciroment)
cell membrane structure
Fluid mosaic model
Bilayer composer of a phospholipids back home with proteins embedded throughout
Flexible and able to move
Head and tail section
Hydrophic (water loving
Hydrophobic (water hating)
Cellular transports 3 ways
Materials transported without the use of energy
Transport of materials with the use of energy
Transport of large materials through the cell membrane
3 types of passive transport
simple diffusion, osmosis, facilitated diffusion
Movement of particles from an area of high concentration to an area of low concentration along a concentration gradient
Movement occurs until particles are scattered evenly
an area having a large amount of particles
An area having a small amount of particles
Difference between an area with many particles and one with few particles
What drives diffusion?
Brownian motion , random motion
What is small enough to cross the cell membrane using simple diffusion
Oxygen, carbon dioxide and alcohols
3 factors that affect the rate of diffusion
Size of particles
Size of concentration gradient
How does the size of particles relate to the rate of diffusion
The smaller the monocle the faster the diffusion occurs
How does the temperature affect the rate of diffusion
The higher the temperature, the faster the rate of diffusion. This is because the particles have more energy so they move around faster
How does the size of the concentration gradient affect the rate of diffusion
The greater the difference between areas with high concentration and areas with low concentration the faster the diffusion occurs
When the particles trying to cross the cell membrane are too large, so they are assisted/ facilitated by special proteins in the cell membrane
Two types of proteins in the cell membrane
Carrier protein facilitated diffusion
Channel protein facilitated diffusion
carrier protein facilitated diffusion
Diffusion of NON-CHARGED molecules across the cell membrane Ex, Glucose
Channel protein facilitated diffusion
Diffusion of charged particles such as ions across the cell membrane
Diffusion of water through a semi permeable membrane.
Water flows from an area of high concentration to an area of low concentration
types of membranes
a membrane that allows all particles to pass through
Membrane that allows some particles to pass through
Membrane that allows no particles to pass through
Osmosis and effects on cells
Concentration of solutions on either side of a membrane. Measured in 3 ways
A solution having an equal concentration of solutes and solvents
A solution having a lower concentration of solutes than solvents
A solution having a greater concentration of solutes than solvent
Hypertonic cell is ...
Hypotonic cell is .....
Isotonic cell is .....
How does the cell use bulk transport
The cell has to energy and the membrane folds in on itself to create vesicles that contain the materials
small sacs to help transport
Two types of bulk transport
endocytosis and exocytosis
Movement of large particles into the cell
Movement of large particles out of the cell
two types of endocytosis
phagocytosis and pinocytosis
Cell eating. The cell injests a piece of solid material such as RBC or bacterium
Cell drinking. The cell injests a small amount of extra cellular fluid from outside the cell (liquids and small molecules)
fluid outside the cell that surrounds and scrubs the crll
Where transport of materials occur with the help of special proteins that act as receptors
cell size: surface area to volume ratio
Mice and elephants have the same size cells (microscopic)
Two critical factors why cells are microscopic
Surface area of the cell membrane
Volume of cytoplasm within a cell
Volume of the cell is....
A measure of the cytoplasm of the cell
What is the ratio of volume of the cytoplasm to the cell
The cell will not survive if....
The cell is not able to increase enough
As cell volume increases
The cell membrane has to increase in size I order to bring in enough nutrients and to get rid of wastes to supply the needs of the cell
two stages of photosynthesis
Where does photosynthesis occur?
Chloroplasts in plant cells
Energy in the cell comes in the form of.....
Two ways cells make energy
What is photosynthesis?
Plants creating energy
What is the combination used in photosynthesis to produce glucose and oxygen
Water+carbon dioxide= glucose and oxygen
Energy in Photosynthesis, and Respiration is used to...
Create molecules, build membranes and organelles, moves monocles in and out of the cell
Cells create atp by combining glucose with oxygen to produce water and carbon dioxide
What is the formula for cellular respiration?
glucose + oxygen > carbon dioxide + water
Where does respiration occur?
Two types of respiration
Respiration that occurs in the presence of oxygen.
What does aerobic respiration release
Water, oxygen and 36 atp molecules
Respiration without oxygen
Two types of anaerobic respiration
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