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.
Action potentials travel along the motor neurones Axon cell membrane, and are basically the depolarisation of the membrane.
Yes.
axon hillock
electrical signal
It is a difference in charge supplied by ion position. In resting potential the tendency is for the inside of the cell membrane to have a negative ionic charge, while the outside of the membrane has a positive charge. The change, back and forth in these two charge potentials is the conduction of charge down the neuron and is called the action potential.
First at the axon hillock where the neural impulse is initially triggered, and then at the nodes of Ranvier as the impulse continues to travel along the axon.(Note that the impulse travels as electrotonic conduction between the nodes of Ranvier, underneath the glial cells which myelinate the axon.)
It is the Axon
Action potentials
Action potentials are found on muscular or neural cells. The propagate along the cells's membrane surface.
axon hillock
electrical signal
Saltatory conduction refers to the propagation of action potentials along myelinated axons from one node of Ranvier to the next node. It increases the conduction velocity of action potentials.
It is a difference in charge supplied by ion position. In resting potential the tendency is for the inside of the cell membrane to have a negative ionic charge, while the outside of the membrane has a positive charge. The change, back and forth in these two charge potentials is the conduction of charge down the neuron and is called the action potential.
Action potentials along the muscle fibers
It is transmitted along action potentials by way of chemical neurotransmitters.
Saltatory conduction is the propagation of action potentials (nerve signals) along axons that occurs by jumping from one node of Ranvier (gap between myelinated sections of axon) to the next. (Saltare means "to hop" or "to jump") By jumping from one node to the next, this increases the conduction velocity, allowing the signal to travel faster.
Action potential
decreasing amplitude
The high-speed signals that pass along the axon are called action potentials. They spread in a wave of depolarization.