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Almost as soon as the depolarization wave begins a repolarization wave follows it across the membrane this occurs as?
Wiki User
∙ 13y ago
This occurs as K+ diffuses out of the cell.
Wiki User
∙ 13y ago
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Generation of Action Potential?
1. Resting potential: all voltage-gates are closed. 2. At threshold, Sodium activation gate opens and Sodium permeability rises. 3. Sodium enters the cell (influx), causing an explosive depolarization to +30 mV, which generation the rising phase of action potential. 4. At peak of action potential, sodium activation gate closes and sodium permeability falls, which reduces the net movement of sodium into the cell. At the same time potassium activation gate opens and potassium permeability rises. . 5. Potassium leaves the cell (efflux), causing the repolarization to resting potential, which generates the falling phase of action potential. 6. On return to resting potential, sodium activation gates closes and inactivation gates opens, resetting channel for another depolarizing triggering event. 7. Further outward movement of potassium through still open potassium channels briefly hyperpolarize membrane, 8. Potassium activation gate closes and membrane returns to resting potential
Is mitochondria surrounded by the double membrane?
Mitochondria have an inner membrane which is highly convoluted (called cristae and is known to increase the surface area of this organelle, therefore providing more space for ATP (energy) production). This inner membrane contains pores that enable substances to pass through them, almost serving like a shortcut so that these molecules don't have to make their way around the 'maze' (the cristae). Mitochondria also have an outer membrane.
How is resting potential achieved?
The resting membrane potential difference between the inside and the outside of the cell is the result of selective permeability of the cell membrane and the active transport of ions into and out of the cell. Almost all cells have a potential difference, but some cells, neuron and heart muscle, also have voltage and chemically gated channels that allow for transient deviations from the resting potential.
Where is the cell membrane located and how is it different from a cell wall?
The cell membrane is located beneath the cell wall. The cell membrane is present in almost all types of cells whereas the cell wall is present in bacteria, fungi, algae, plant cell and is absent in protozoans and animal cells. The cell membrane is semipermeable and give support to the cytoskeleton of the cell, gives shape to the cell and helps in the formation of tissues whereas the function of the cell wall is to provide strength and rigidity to the cell, protects the cell against mechanical forces. The cell membrane is not elastic but permeable whereas the cell wall is elastic and controls turgidity. The cell membrane is found in animal cells wheres the cell wall is found in plant cells. The cell membrane is made up of lipids and proteins whereas the cell wall is made up of cellulose.
What do proteins do for the cell?
There are many uses for proteins in a cell membrane but the most common ones are: 1. Facilitated diffusion- a protein acts almost like a channel to allow molecules that cannot fit across the phospholipid bilayer to diffuse into/out of the cell 2. Active transport- proteins are used to move particles across the membrane from low to high concentration, using energy. 3. As receptor molecules which take signals from things like hormones.
Fluid-filled sacs surrounded by a membrane almost identical to the cell membrane of human cells are called?
Vacuole!
What does a eukarytoe have that a prokaryote does not?
Almost everything but the most important one is a cell membrane.
Does Robert Pattinson go to clubs a lot?
no paparazzi follows him EVERYWHERE. he almost never goes out.
What job does a cell membrane do in a plant cell?
It's the brain of the cell. It controls almost every thing in the cell.
Generation of Action Potential?
1. Resting potential: all voltage-gates are closed. 2. At threshold, Sodium activation gate opens and Sodium permeability rises. 3. Sodium enters the cell (influx), causing an explosive depolarization to +30 mV, which generation the rising phase of action potential. 4. At peak of action potential, sodium activation gate closes and sodium permeability falls, which reduces the net movement of sodium into the cell. At the same time potassium activation gate opens and potassium permeability rises. . 5. Potassium leaves the cell (efflux), causing the repolarization to resting potential, which generates the falling phase of action potential. 6. On return to resting potential, sodium activation gates closes and inactivation gates opens, resetting channel for another depolarizing triggering event. 7. Further outward movement of potassium through still open potassium channels briefly hyperpolarize membrane, 8. Potassium activation gate closes and membrane returns to resting potential
What are proteins needed to build in organisms?
Almost everything with a structural function, enzymes, pores in the cell membrane to pump ions, receptors, etc.
The fundamental structure of the plasma membrane is determined almost exclusively by?
Lipids, in the form of the bi-lipid layer.
In what way is a membrane fluid?
it moves very water-like, almost like the phospholipids are floating ping pong balls on water always adjusting.
Is mitochondria surrounded by the double membrane?
Mitochondria have an inner membrane which is highly convoluted (called cristae and is known to increase the surface area of this organelle, therefore providing more space for ATP (energy) production). This inner membrane contains pores that enable substances to pass through them, almost serving like a shortcut so that these molecules don't have to make their way around the 'maze' (the cristae). Mitochondria also have an outer membrane.
How is resting potential achieved?
The resting membrane potential difference between the inside and the outside of the cell is the result of selective permeability of the cell membrane and the active transport of ions into and out of the cell. Almost all cells have a potential difference, but some cells, neuron and heart muscle, also have voltage and chemically gated channels that allow for transient deviations from the resting potential.
What is a Biological Membrane?
A biological membrane or biomembrane is an enclosing that acts as a barrier within or around a cell. It is, almost always, a lipid bilayer, composed of a double layer of lipid-class molecules, specifically phospholipids, with occasional proteins intertwined, some of which function as channels chris mama
Do all cell membrane contain cholesterol?
Yes, all cells contain cell membrane, like animal and plant cell. But not all cells contain cell wall, this is why such cells contain cell membrane. Cell membrane, and without the cell wall, protect the things going in and out of a cell, like nutrients and oxygen in, and waste and carbon dioxide out. Cell membrane could also be described as a "wall for the house" which is the cell. Yes they do. The cell membrane keeps the cell together. With out it, all the organelles would fall out. Animal cell membrane is circular but has a very hard to figure out shape. It is mostly just random. Plant cells however, have an almost perfect rectangle for cells.
