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Well there are many different factors that might dictate whether or not a molecule is capable of passively (diffusion) crossing the threshold of the phosolipid bi-layer (cell membrane). The size would be one variable. If it is too large, it might require assistance to cross over. The polarity of the molecule as it might interact negatively (no pun intended) with the polarity of either the cell membrane or the cell entirely, if it contains large amounts of opposing ions. And then, of course, the concentration gradient of the molecule and how much of this same molecule exists in and outside the cell itself. If any of these obstacles exists, the molecule would require active transport into the cell, which means it would require the expenditure of energy, or a pump or gateway of some kind, depending on the substance...
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How is most glucose transported into cells?
Passive transport is the kind of movement Êwhen glucose enters a liver cell through a protein channel. It does not require an input of chemical energy being driven by the growth of entropy in the system.Ê
Why is the cell membrane called semi-permeable?
The cell membrane is hydrophilic outside and hydrophobic from inside thanks to the phospholipid. The membrane also contains protein gated channels which allow some molecules to pass through and ion channels. The transport in an out of cells is also controlled by osmotic pressure, the electric charge etc.
Where in the respiratory tract does gas exchange occur?
The gas occurs by simple diffusion through the cells.
What type of molecules insulin?
Insulin is a hormone released by the beta cells in your pancreas, when there is glucose (sugar) in your blood. Insulin goes through the blood stream and basically tells the cells of the body that there is glucose in the blood stream. and the cells respond to it by stopping glucagon breakdown, start making glucagon, taking up glucose into the cells with glucose transporters. A hormone is a molecule that is released in one part of the body, but works in another.
Is oxygen entering liver cells from the blood an example of diffusion?
Yes it is.
What is the diffusion problem how is it solved in eukaryotic cells?
The diffusion problem is based on relative concentrations in and outside of the cell and a lipid bilayer´s permeability to most of the ions essential to cell processes. It is solved by active transport and facilitated diffusion through protein channels and pumps both passively and through the use of ATP. .... I think ...
How do your cells get oxygen glucose and the raw materials that they need to respire?
Your cells get oxygen and glucose through protein channels located on their cell membrane the phospholipid bilayer surrounding a cell.
What moves things through the cell membrane?
If you mean through the cells itself, that would be the endoplasmic reticulum but if you mean substances from the outside of the cell into the cell that is done by protein channels.
What the role of protein channels in the cell membrane?
Protein channels are important to facilitate the transport of ions and other larger molecules across the plasma membrane. Large molecules cannot just diffuse thorough the membrane. In addition, polar molecules cannot diffuse through the membrane since it would be energetically unfavorable for them to negotiate the hydrophobic interior of the plasma membrane. Therefore, protein channels are essential in membrane transport.
How do the cells of a hydra get oxygen?
Hydra cells get oxygen through diffusion.
How do the cells of the hydra get oxygen?
Hydra cells get oxygen through diffusion.
The movement of oxygen into cells from the bloodstream is accomplished through?
Diffusion, specifically simple diffusion
What best explain the passage of air across alveolar membranes?
diffusion, through moist thin, epithelial cells
What is the difference between simple diffusion and facilitated diffusion?
It doesn't. (answer by RRU member Cyrem)
What is an example of diffusion of H2O through a DPM?
has to do with cells & diffusion biology 2 in high school
What are two ways of moving things in and out of a cell that do not need energy?
transpiration and diffusion through cell walls.Tranpiration is only for plant cells and animals cells do not have a cell wall. For animal cells there is diffusion and omosis through cell membranes.diffusion, osmosis, and facilitated diffusion
Do red blood cells go through osmosis or diffusion?
I believe red blood cells go through diffusion...just type this question into google: how do red blood cells use diffusion? and you should get some quality answers. hope this helps!
