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Aquaporins.
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Water crosses plasma membranes through specialized channels?
Water crosses plasma membranes through specialized channels called diffusion and concentrated gradient.
Do aquaporins participate in active transport in a cell?
No, aquaporin's do not need a living cell in order to function. Aquaporin's are water channels that permit water channels to cross membranes.
Do hydrophilic heads on plasma membranes attract or reple water?
Attract
What is the forcing of water and solutes through plasma membranes by blood pressure?
osmosis
What are the principle components of plasma membrance and membrance surrounding cell organelles?
Phospholipids are the principle component behind plasma membranes and the membranes surrounding cell organelles. They create a hydrophobic (water repellent) boundary that keeps what's needed in and what's not, out.
Water crosses plasma membranes through specialized channels?
Water crosses plasma membranes through specialized channels called diffusion and concentrated gradient.
Do aquaporins participate in active transport in a cell?
No, aquaporin's do not need a living cell in order to function. Aquaporin's are water channels that permit water channels to cross membranes.
Do hydrophilic heads on plasma membranes attract or reple water?
Attract
What is the forcing of water and solutes through plasma membranes by blood pressure?
osmosis
What kinds of substances do the protein channels allowed to cross membranes?
The protein channels (or carrier) allow substances that would not normally go through. These are larger molecules or ions.There are two kinds of transport protein:Channel Proteins which form a water-filled pore or channel in the membrane. This allows charged substances (usually ions) to diffuse across membranes. Most channels can be gated (opened or closed), allowing the cell to control the entry and exit of ions.Carrier Proteins which have a binding site for a specific solute and constantly flip between two states so that the site is alternately open to opposite sides of the membrane. The substance will bind on the side where it at a high concentration and be released where it is at a low concentration.
What are the principle components of plasma membrance and membrance surrounding cell organelles?
Phospholipids are the principle component behind plasma membranes and the membranes surrounding cell organelles. They create a hydrophobic (water repellent) boundary that keeps what's needed in and what's not, out.
Why does water require channels to be transported across the membranes?
Water doesn't require channels to be transported across membranes because water is small enough to slip past the membrane; however, some cells do have channels, called aquaporins, which greatly increase the rate that water passes through the membrane.
Is the plasma memebrane a single-layered membrane?
No. Plasma membranes are a phospholipid bilayer with one end that likes water and one that is repelled by water. The phosphate portions are "heads" and line up on the outsides with the "heads" on the outsides.
Why is the phospholipid molecule so appropriate as the primary structural component of plasma membranes?
have a water-soluble part and a water-insoluble part
How water cross the plasma membrane?
I think it's cytoplasme, but I don't exactly know.
When the concentration of antidiruetic hormone rises in the blood?
water channels, or aquaporins, appear in the cell membranes of the collecting duct epithelial cells promoting the reabsorption of water from the filtrate
What is actively transported across plasma membranes?
name of the substance that is actively transported through the cell membrance of an animal cell
