Very Very Tough Question....?

Question

What function might each of the 3 types of diffusion serve in an independent cell like a Paramecium or an amoeba?

(simple diffusion, facilitated diffusion, and Active Transport)

Answer 1

Movement of substances across the cell membrane is the function of the 3 types of diffusion.


The generalized cell functions include movement of substances across the cell membrane, cell division to make new cells, and protein synthesis.


Movement of substances across the cell membrane
The survival of the cell depends on maintaining the difference between extracellular and intracellular material. Mechanisms of movement across the cell membrane include simple diffusion, osmosis, filtration, active transport, endocytosis, and exocytosis.

Simple diffusion is the movement of particles (solutes) from a region of higher solute concentration to a region of lower solute concentration. Osmosis is the diffusion of solvent or water molecules through a selectively permeable membrane. Filtration utilizes pressure to push substances through a membrane. Active transport moves substances against a concentration gradient from a region of lower concentration to a region of higher concentration. It requires a carrier molecule and uses energy. Endocytosis refers to the formation of vesicles to transfer particles and droplets from outside to inside the cell. Secretory vesicles are moved from the inside to the outside of the cell by exocytosis.

Answer 2

The need for three different types of diffusion arises from the diffusion pressures on different solutes. If you have a high concentration of a molecule outside the cell and you need more inside, then simple diffusion with an open channel will often suffice. Facilitated diffusion is a more complex version of the above, but still does not require a molecule of ATP or another energy source. Facilitated diffusion tends to be used with larger solutes in order to maintain selectivity and prevent the unregulated diffusion of smaller solutes. If you have a situation in which the pressure gradients (like concentration) oppose the desired direction of transport, you need to burn energy, like ATP. The active transporters will grab the desired solute, binding of ATP will induce a conformational change, the solute will be transported, and ATP will be cleaved. I'm sure you're learning about all of the different types of diffusion pressure and what is being transported where.

Good luck

Answer 3

Well water, oxygen, CO2 would diffuse simply. Facilitated diffusion is necessary for transport of nutrients, glucose, etc. and ion pumps are active transport. Cells need to maintain certain ion concentrations.

Answer 4

http://www.vivo.colostate.edu/hbooks/cmb/cells/pmemb/diffusion_f.html
Facilitated diffusion allows nutrients to diffuse through membranes that are other wise impermiable to them.
Simple diffusion would allow nutrients to permiate an area not separated by membranes.
http://staff.jccc.net/PDECELL/cells/activet.html
Active transport requires a source of energy to drive a
particular type of nutrient or other molecule across a membrane via proteins.
This could be for reuptake of a neurotransmitter, for instance. A process which decreases entropy in a small area (of course entropy increases generally).
Life requires increasing organization through metabolic processes and anabolic processes.
Active transport as mandated by the DNA template of the gene is the means of expression.

Answer 5

simple-helps w// nutrients and stuff
facilitated- waste and sometimes nutrients
Active TRansport- in and out of the cell mostly
rememeber diffusion is the process of substances to high concentration to low

Answer 6

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Answer 7

More details required

Answer 8

it depends...