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In which direction do potassium ions flow as the action potential passes?
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.
How is an action potential self-regenerating?
depolarizing currents established by the influx of Na+ flow down the axon and trigger an action potential at the next segment
What causes the rapid change in the resting membranes potential that initiates an action potential?
In muscle cells the inward current is a sodium + calcium flow through acetycholine activated channels as well as through voltage sensitive calcium channels.
Which causes water to flow out of a cell causing the cell to shrivel or even die?
crenation
In which direction do potassium ions flow as the action potential passes?
Out of the cell
What ion is the rising phase of the action potential?
Sodium ions are responsible for the rising phase of the action potential. This occurs when sodium channels open and sodium ions flow into the cell, causing depolarization.
What cell membrane do action potentials travel along?
The membrane or resting potential is the difference in voltage within and outside the cell when that cell is at rest. In a typical neuron it is usually around -65mV, meaning the neuron is negatively charged relative to the extracellular space. This potential is due to various ions and the permeability of the neuronal membrane. When a neuron gets a signal from another neuron, this causes the concentration of various ions to change (some flow in, others out of, the cell). In some cases, the signal causes positive ions to flow into the cell, making the membrane potential less negative. Once it reaches a threshold, usually around -55mV, the cell "fires" or makes an action potential, which is when the membrane potential temporarily shoots up to around +40mV. This signal propagates down the length of the neuron and then passes that message on to other cells.
If a resting neuron is stimulated and there is an inward flow of positive charges into the cell the membrane potential will?
If a resting neuron is stimulated and there is an inward flow of positive charges into the cell, the membrane potential will depolarize, meaning the inside of the cell becomes less negative. This can trigger an action potential if the depolarization reaches the threshold level.
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.
What causes electric flow in a circuit?
Potential difference, voltage.
What causes an elecrtic current to flow in a circuit?
The movement of electron towards the high potential causes electric current to flow in a circuit.
How is an action potential self-regenerating?
depolarizing currents established by the influx of Na+ flow down the axon and trigger an action potential at the next segment
When you touch something hot a neuron in your fingers senses the temperature which best decscribes the first reaction the neuron has?
Ions flow into the neuron. An action potential forms moves along the neuron. A response occurs, here, an aversion response... your body pulls your hand and finger away.
What causes the rapid change in the resting membranes potential that initiates an action potential?
In muscle cells the inward current is a sodium + calcium flow through acetycholine activated channels as well as through voltage sensitive calcium channels.
What does solar have to do with electricity?
They are both the flow of electrons. They both have action potential when they are harnessed.
What causes current to flow in dry cell?
an acid paste reacts with the metal casing which causes electrons to flow to a carbon rod
