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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...
What else can I help you with?
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.
How can cells regulate the diffusion of molecules through protein channels?
Cells can regulate the diffusion of molecules through protein channels by controlling the opening and closing of these channels. This regulation can be achieved through various mechanisms, such as changes in the cell's membrane potential or the binding of specific molecules to the channel proteins. By adjusting the activity of these channels, cells can selectively allow certain molecules to pass through while blocking others.
What is faciliated diffusion?
Facilitated diffusion is a type of passive transport in cells where specific molecules are moved across the cell membrane with the help of protein channels or carriers. These proteins assist in the movement of molecules that cannot easily pass through the lipid bilayer on their own.
What is the transmembrane protein channels that are specialized for the passage of water?
The transmembrane protein channels that are specialized for the passage of water is aquaporin's. Osmosis is the diffusion of water down its concentration gradient.
What passes through the protein channel?
Proteins and other molecules can pass through protein channels in biological membranes based on their size, charge, and shape. The channels allow specific substances to move in and out of cells, helping in maintaining cellular functions and communication.
How does eukaryotic and prokaryotic organisms undergo facilitated diffusion?
Diffusion is the ability of molecules to follow a concentration gradient, moving from regions of high to low concentration. For small, nonpolar molecules such as O2, CO2, and some narcotics, they are small enough to slip through the phospholipid bilayer of the plasma membrane. Small, polar molecules such as water, are also small enough to slip through, but because of their polar nature, this movement is impeded by a factor of 1000. What about larger molecules like glucose? These molecules are too big to slip through the phospholipid bilayer, regardless of the concentration gradient. Larger molecules require a protein channel for transport across the plasma membrane. Because the movement will be driven by the concentration gradient, this movement is called facilitated diffusion, to indicate that a protein channel is necessary. Both prokaryotic and eukaryotic cells have protein channels for this purpose.
Where is Most of the communication between the interior and exterior of the cells occurs by way of?
Most of the communication between the interior and exterior of cells occurs through the cell membrane. The cell membrane regulates the passage of substances in and out of the cell through various processes such as diffusion, osmosis, and active transport. It also contains receptor proteins that allow cells to respond to signals from their environment.
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.
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.
How do nutrients get into cells and what is the process involved in their transportation?
Nutrients enter cells through a process called active transport or passive diffusion. Active transport requires energy and specific carrier proteins to move nutrients across the cell membrane, while passive diffusion relies on the concentration gradient to allow nutrients to move freely into the cell. Once inside the cell, nutrients are transported to different parts of the cell through various pathways, such as vesicle transport or protein channels.
How do the cells of the hydra get oxygen?
Hydra cells get oxygen through diffusion.
What is an example of diffusion of H2O through a DPM?
has to do with cells & diffusion biology 2 in high school
How is passive transport different in plant cells and animal cells?
Plants have cell walls, whereas animals do not. The cell wall changes the characteristics of molecules able to passively (enter and exit) diffuse into plant cells and this also helps to better retain them inside the cell.
