0
What else can I help you with?
A neuron fires only when its membrane reaches what?
A neuron fires when its membrane reaches a certain threshold potential. This threshold potential is typically around -55 to -65 millivolts. When the membrane potential reaches this level, an action potential is triggered and the neuron fires.
Where is the Tigger zone on a unipolar neuron?
The "Tigger zone" in a unipolar neuron is the initial segment of the axon where action potentials are generated. Here, graded potentials from the dendrites accumulate and if they reach a certain threshold, an action potential is triggered.
What causes the action potential for the release of TRH?
The action potential for the release of thyrotropin-releasing hormone (TRH) is primarily triggered by depolarization of the neuron, which occurs when excitatory neurotransmitters bind to receptors on the hypothalamic neurons. This depolarization causes voltage-gated sodium channels to open, leading to an influx of sodium ions and further depolarization. Once the membrane potential reaches a threshold, an action potential is generated, propagating along the axon and ultimately resulting in the exocytosis of TRH from the nerve terminals into the portal circulation.
When is a nerve depolarized?
A nerve is depolarized when there is a shift in the resting membrane potential towards more positive values, usually triggered by the opening of voltage-gated ion channels. This initiates an action potential that allows for the transmission of electrical signals along the nerve cell.
Will a hyperpolarization graded potential lead to an action potential?
No, hyperpolarization graded potentials do not lead to action potentials. Hyperpolarization makes the membrane potential more negative, which inhibits the generation of an action potential by increasing the distance from the threshold potential needed to trigger an action potential.
An action potential either fires completely or not at all. this is know as?
"all-or-none principle." In this principle, once the threshold for firing an action potential is reached, it will occur at full strength regardless of the strength of the stimulus that triggered it.
Is triggered a verb?
yes, a verb is an action word and your able to do it ex.sally triggered the alarm
A neuron fires only when its membrane reaches what?
A neuron fires when its membrane reaches a certain threshold potential. This threshold potential is typically around -55 to -65 millivolts. When the membrane potential reaches this level, an action potential is triggered and the neuron fires.
What triggers an action potential in the optic nerve?
An action potential in the optic nerve is triggered when light hits photoreceptor cells in the retina, leading to a change in membrane potential. This change initiates a series of graded potentials that, if strong enough, can reach the threshold to generate an action potential in the ganglion cells. The action potential then travels along the optic nerve to transmit visual information to the brain. The process involves the conversion of light signals into electrical signals through phototransduction and synaptic transmission.
What are the key differences between action potential and graded potential in terms of their mechanisms and functions?
Action potentials are rapid, all-or-nothing electrical signals that travel along the axon of a neuron, triggered by a threshold stimulus. Graded potentials are slower, variable electrical signals that occur in response to a stimulus, but do not necessarily reach the threshold for an action potential. Action potentials are essential for long-distance communication in the nervous system, while graded potentials play a role in short-distance signaling and can summate to trigger an action potential.
Where is the Tigger zone on a unipolar neuron?
The "Tigger zone" in a unipolar neuron is the initial segment of the axon where action potentials are generated. Here, graded potentials from the dendrites accumulate and if they reach a certain threshold, an action potential is triggered.
A Russian action that almost triggered another European conflict was?
Communist propaganda almost triggered another European conflict.
What are the key differences between graded potential and action potential in terms of their mechanisms and functions?
Graded potentials are small changes in membrane potential that can be either depolarizing or hyperpolarizing, and they occur in response to stimuli. They are localized and can vary in strength. Action potentials, on the other hand, are large, all-or-nothing changes in membrane potential that are triggered when a threshold is reached. They are propagated along the axon and are essential for long-distance communication in neurons.
What causes the action potential for the release of TRH?
The action potential for the release of thyrotropin-releasing hormone (TRH) is primarily triggered by depolarization of the neuron, which occurs when excitatory neurotransmitters bind to receptors on the hypothalamic neurons. This depolarization causes voltage-gated sodium channels to open, leading to an influx of sodium ions and further depolarization. Once the membrane potential reaches a threshold, an action potential is generated, propagating along the axon and ultimately resulting in the exocytosis of TRH from the nerve terminals into the portal circulation.
When is a nerve depolarized?
A nerve is depolarized when there is a shift in the resting membrane potential towards more positive values, usually triggered by the opening of voltage-gated ion channels. This initiates an action potential that allows for the transmission of electrical signals along the nerve cell.
What was the effect of curare on eliciting an action potential?
It creates an action potential
Will a hyperpolarization graded potential lead to an action potential?
No, hyperpolarization graded potentials do not lead to action potentials. Hyperpolarization makes the membrane potential more negative, which inhibits the generation of an action potential by increasing the distance from the threshold potential needed to trigger an action potential.
