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Water moves across plasma membranes due to "Osmosis". Water may also move through the plasma membrane by flowing down a gradient from outside the cell into the inside of the cell since there is a less concentration of of water inside the cell (there are more things in the cell other than water such as proteins, hormones, and other substances).
Wiki User
∙ 14y ago
Wiki User
∙ 13y agoThe structure of the plasma membrane consists of the phospholipid bilayer, which gives it a fluid structure, and not rigid, allowing the materials ease to pass through. Next, there are also integral proteins which can be thought of as 'tunnels', allowing the materials to come in and out. Then, there are peripheral proteins which also aid in getting the materials inside an out. On the cell membrane, there are receptors which recognize outside materials, and if they are really big, the cell engulfs these molecules through endocytosis [pinocytosis, and phagocytosis, which are basically for liquid molecules, and solid molecules]. This takes us back to the fluidity of the cell membrane. That's roughly how the cell membrane allows for the entering and exiting materials.
Wiki User
∙ 11y agoVia osmosis, the movement of water molecules from an area of high concentration to low through a semi-permeable membrane
Wiki User
∙ 9y agoOsmosis occurs, where water moves from a region of high solute concentration to a region of low solute concentration, passing through protein channels. This is a passive process.
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When ions move across a plasma membrane what will happen?
they create a flow of electrical currrent that can disturb the resting membrane potential.
What molecules will move easily across the cell membrane: large proteins, starch, water, or DNA?
It depends on the membrane, but generally water is the only one that will move across unaided. The rest are too large.
When will water move acroos a membrane?
There will be a net movement of water across a selectively permeable membrane from where the water is in high concentration to where it is in low concentration.
What is The plasma membrane helps to maintain a cells what?
The plasma membrane helps to maintain homeostassi within the cell by allowing substances to move in and out of the cell the plasma membrane is used to maintain homeostasis within the cell by allowing substances to move in and out of the cell
What is the name of the process where materials are moved across a cell membrane?
Active transport.The energy is provided by a high-energy molecule, often ATP.Active transport is used to move a substance against (= up) its concentration gradient.Diffusion is what moves across the plasma membrane. This cannot move across water.
What is the process that utilizes a carrier to move materials across the plasma membrane in the direction of the concentration gradient that does not use ATP?
Active Transport
What is the process that utilizes a carrier to move marerials across the plasma membrane in the direction of the concentration?
Diffusion is what carries materials across the plasma membrane. The diffusion cannot be moved across water.
How does lipid soluble move across the plasma membrane?
by dissolving in the lipid bilayer.
What is a transport process by which gases move through a membrane?
Simple Diffusion
Describe how dissolved particles move across a plasma membrane form regions of lower to higher concentrations?
Things move across the membrane from lower to higher concentrations by active transport.
When ions move across a plasma membrane what will happen?
they create a flow of electrical currrent that can disturb the resting membrane potential.
Why is it necessary for movement across a plasma membrane?
There are many reasons to move things across the plasma membrane. Any molecule that is soluble in water cannot cross the plasma membrane because the inner layer is hydrophobic (repels water). This includes molecules that are critical for cell survival, such as positively charged ions such as sodium and calcium, as well as water and glucose. All of these substances must be passed across passively (without energy expenditure) or actively (with energy expenditure). These processes are generally carried out by specific proteins, which provide a hydrophilic (water loving) path or channel through the membrane.
Active transport requires what?
Energy-requiring process by which substances move across the plasma membrane against a concentration gradient.
The process that utilizes a transporter to move materials across the plasma membrane against the concertration gradient using ATP?
diffusion
What molecules will move easily across the cell membrane: large proteins, starch, water, or DNA?
It depends on the membrane, but generally water is the only one that will move across unaided. The rest are too large.
When will water move acroos a membrane?
There will be a net movement of water across a selectively permeable membrane from where the water is in high concentration to where it is in low concentration.
What is the movement of materials across a membrane that requires energy input called?
Active transport requires energy and proteins to move the materials across the cell membrane. This is in contrast to osmosis, which doesn't require energy to move the material.
