0
Name 3 particles that are small enough to diffuse freely across the cell membrane?
Wiki User
∙ 12y ago
H2O
CO2
O2
hope this helps
Wiki User
∙ 12y ago
Add your answer:
Earn +20 pts
Will glucose and albumin diffuse through 200 MWCO?
cuz Albumin has much higher weight other than 200 while Glucose has 180 Da, small enough to pass through the membrane pores
What is the name of the process when glucose enters cells?
Glucose can move into cells by active or passive transport, in both cases membrane-spanning proteins are required. Active transport (SGLT) uses the concentration gradient of Sodium ions to move glucose against its concentration gradient. Passive transporters (GLUT) are only effective if the concentration of glucose in the cell is lower than outside the cell.
Describe how the diffusion of ions across a cell membrane differs from the diffusion of nonpolar molecules across the cell membrane?
Ions need to be facilitated through a cell membrane because they are passing through a phospholipid bilayer with a hydrophobic interior. Non polar molecules are also hydrophobic, so they can pass through the membrane easily if they are small enough. Ions are polar, so they have a hard time passing through membranes.
What happens if the pleura membrane secrets too much fluid or doesn't produce enough fluid?
Not enough could cause friction.
What is the movement of molecules from areas of higher concentration to lower concentration until equilibrium is met?
The movement of particles from an area of high concentration through a semi-permeable membrane to an area of low concentraton is the process of diffusion. I'm sorry but I do not think that answer is good enough. It is a form of diffusion, where only small particles, small enough to pass through the membrane can get through. When I was in school the statement above was the definition of osmosis, the whole point being it was diffusion through a semi-permeable membrane, selecting for only small enough particles. It seems some time between 1992 and 2003 the definition was changed to the movement of water, and not particles and now in 2010 the definition is the movement of solvents. I would like to know how and why the definition osmosis was changed, why and what is the justification? I would also like to know why the original meaning of osmosis, which made perfect sense, has been changed to "it's the definition of diffusion and not osmosis any more", when in fact it isn't a clear enough word to describe the process? Surely the new definition of osmosis is also diffusion?
Why ions need energy to transfer through plasma membrane?
Energy is only necessary for diffusion if the particles are being moved across the membrane against the gradient. ATP is necessary for this active transport as particles are moved from low concentrations to higher concentrations across the membrane. This is because passive transport, which does not use energy, only works to move particles down their concentration gradient. Ex. Such active transport is used in neuron cells to have a different charge inside and outside of the cell so that it can relay electric signals.
How does your body know what nutrients needs to enter the bloodstream?
The answer is very simple, it does not. Any particle that is small enough to diffuse through the cell membrane can, and will diffuse into the blood. That is why it is so important not to put things into your body that are not good for you. Your body will absorb them without knowing if it is bad or good.
What is ATP's role in the cell?
ATP is a molecule that helps supply enough energy to perform active transport. Without it, the molecules in the cell cannot diffuse across the cell because there isn't enough energy.
When does most nutrient absorption occur?
Most absorption of nutrients occurs in the small intestine. And as far as digestion itself, it would be after the food particles are small enough to diffuse through the blood capillaries.
How does the movement of particles in matter change when heat is added?
When heat is added, the particles have more energy so they will vibrate more and move around more If in solid the will vibrate more and if heated long enough they will break the bonds and melt In liquids they will have enough energy to turn into gas In gasses they will diffuse into the air and go further and further away
What particles are able to pass freely through a cell membrane?
This is unique to each cell. Some particles are small enough to diffuse freely in most cells. Other particles require varying types of transport mechanisms to cross the cell membrane. If it is a substance the cell either needs to take in or get rid of, there are proteins and other mechanisms to accomplish this. There are even actions of the cell in order to export or import substances.
Will glucose and albumin diffuse through 200 MWCO?
cuz Albumin has much higher weight other than 200 while Glucose has 180 Da, small enough to pass through the membrane pores
What are two main problems a cell would have if it grew too large?
The cell has more trouble moving enough nutrients & wastes across the cell membrane.
What is the name of the process when glucose enters cells?
Glucose can move into cells by active or passive transport, in both cases membrane-spanning proteins are required. Active transport (SGLT) uses the concentration gradient of Sodium ions to move glucose against its concentration gradient. Passive transporters (GLUT) are only effective if the concentration of glucose in the cell is lower than outside the cell.
In osmosos how do molecules move?
Water molecules move with the help of membrane proteins called aquaporins, which regulate the movement of water in an out of the cell. Because of the dual nature of the membrane (hydrophobic and hydrophilic), water doesn't simply diffuse in an out, although a certain percentage can slip in between phospholipids.
Why aren't there cells 1 foot in diameter or larger?
The reason there is a limit on the size of a single living cell is the mass to surface area ratio. The membrane is where oxygen is exchanged and molecules diffuse and are transported. A membrane will increase linearly with the diameter but the internal volume will increase to the cube of the diameter so at some point there is not enough membrane to service the large amount of living 'stuff' in the cytoplasm.
How can osmosis be considered to be the fusion of water across a membrane?
Osmosis is not fusion, and the only way it could be considered to be that is if someone wasn't paying close enough attention when it was being explained.
