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Which membrane potential results in depolarization without a nerve impulse being generated?
excitatory postsynaptic potential
What is impulse in the nervous system?
electrical wave conducted along the nerve generated by the voltage difference across the cell membrane of the nerve cells.
Is an action spike an impulse created by an excitable membrane when it reaches the threshold?
Yes, an action potential spike is generated when the membrane potential of a neuron reaches a certain threshold, causing a rapid depolarization and repolarization of the membrane. This creates a brief electrical impulse that propagates along the neuron's axon.
This type of potential is a brief electrical impulse produced by ions crossing the axon membrane?
The type of potential described is an action potential. It is generated by the movement of ions such as sodium and potassium across the axon membrane, leading to a rapid change in voltage that allows for the transmission of signals along the neuron.
What is the neural impulse generated by the movement of positively charged atoms in and out of channels in the axon's membrane?
The movement of positively charged atoms, such as sodium and potassium ions, in and out of channels in the axon's membrane generates an electrical signal called an action potential. This action potential serves as the neural impulse that travels along the axon to transmit information within the nervous system.
How are neural impulses generated?
Neural impulses are generated when a neuron receives signals from other neurons or sensory receptors, causing a change in its membrane potential. This change in membrane potential triggers an action potential, a rapid electrical signal that travels down the axon of the neuron. This action potential then triggers the release of neurotransmitters at the synapse, allowing the signal to be passed on to other neurons.
What are the sources of stimulation that start a nerve impulse?
Sources of stimulation that can start a nerve impulse include chemical signals (neurotransmitters released at synapses), physical stimuli (such as pressure or temperature changes acting on sensory receptors), and electrical signals (generated by neighboring neurons or external electrical sources). These stimulations can trigger the opening of ion channels in the neuron's membrane, leading to changes in membrane potential and initiation of an action potential.
What is the membrane of a nerve cell is comprised of?
Its main function is to propagate the action potential (the 'impulse') along the length of the axon.
What is resting potential?
A rest potential is the potential difference between two sides of the membrane of nerve cells when the cell is not conducting an impulse. =)
Is it true that an action potential is basically an electrical current?
Yes, an action potential is essentially an electrical current that travels along the membrane of a neuron. It is generated by the movement of ions across the neuron's membrane, creating a rapid change in voltage.
A neuron starts to fire an impulse by the influx of what ions?
A neuron fires an impulse by the influx of sodium ions into the cell. This creates a temporary change in the neuron's membrane potential, leading to depolarization and the generation of an action potential.
Describe the events occurring in the cell membrane that permit the conduction of an impulse?
When a nerve impulse is conducted, the neuronal cell membrane undergoes changes in electrical potential. This starts with a rapid influx of sodium ions into the cell through voltage-gated sodium channels, depolarizing the membrane. This depolarization triggers the opening of adjacent sodium channels, resulting in an action potential that travels along the membrane. After the impulse passes, the sodium channels close, and potassium channels open, allowing potassium ions to exit the cell and restore the resting potential.
