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What causes rapid depolarization phase of a pacemaker cell?
Rapid depolarization happens after the membrane threshold has been reached and Na+ ions start to flow into the cell. As more Na+ ions flood in the cell becomes more and more positive. This causes the voltage gated Na+ channels to open creating a flood of Na+ ions and thus a rapid phase of depolarization. Shortly after this rapid phase K+ ions are released from the cell causing the cell to become more negative closing the Na+ channels and thus repolarizing the cell.
When a cell is placed in a hypotonic solution will the flow of water be in or out of the cell?
The water will flow out of the cell.
What passes from the neuron to the muscle cells and what effect does it produce?
Acetylcholine (ACh) is the neurotransmitter that passes from neuron to muscle cells and it causes the Na/K channels to open allowing Na+ to flow into the cell triggering an action potential.
Which cell organelle regulates the flow of nutrients in and out of the cell?
The Cell membrane
Which cell can cytoplasm flow in?
The white blood cell.
What controls the materials flow in and out of the cell?
the cell membrane
What control the flow of substances in and out of a cell?
The cell membrane
The sodium-potassium pump transports what?
Na+ out of the cell and K+ into the cell
How can the cell move sodium out of the cell?
by pumping sodium ions out of the cell with the Na+/K+ ATPase
There is a greater concentration of na plus and there is a greater concentration of k plus in the cell?
There is a greater concentration of Na plus outside and there is a greater concentration of K plus inside the cell. When the stimulus is delivered, the permeability of the membrane is changed, and Na plus diffuses into the cell, initiating the depolarization of the membrane.
How does diffusion help the cell get nutrition?
It lets the cell nutrition flow into the cell.
Electrons in a galvanic cell normally flow?
A galvanic cell is a spontaneous reaction so electron flow will occur as long as a salt bridge is present.
