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How does threshold change during the relative refractory period?
During the relative refractory period, the threshold for excitation is increased compared to the resting threshold. This is because the membrane potential is closer to its resting state, making it more difficult to depolarize the cell and generate an action potential. It requires a stronger stimulus to overcome this increased threshold and trigger another action potential.
What is the sequence of events that correlates to the sequence of events of a nerve impulse?
2,1,3,4
When a sensory neuron is excited by some form of energy the resulting graded potential is called?
The resulting graded potential is called a generator potential when a sensory neuron is excited by some form of energy. This potential may trigger an action potential if it reaches threshold.
What is the definition of time in scientific terms?
The dimension of the physical universe which orders the sequence of events at a given place; also, a designated instant in this sequence, such as the time of day, technically known as an epoch, or sometimes as an instant.
When events are arranged in time sequence from first to last they are said to be in order.?
That is correct. When events are arranged chronologically from beginning to end, they are said to be in order. This helps to create a clear timeline and understanding of how events unfolded.
What is the sequence of events that follow a threshold potential?
Following a threshold potential, voltage-gated sodium channels open, allowing sodium ions to rush into the cell, depolarizing the membrane. This triggers an action potential that spreads down the length of the neuron. Once the action potential reaches the end of the neuron, it triggers the release of neurotransmitters into the synaptic cleft to communicate with the next neuron.
Arrange these action potential events in their proper sequence?
The correct sequence of action potential events is: 1. Resting membrane potential, 2. Depolarization, 3. Repolarization, 4. Hyperpolarization.
What is the threshold of a neuron and how is it similar to a row of falling dominoes?
The threshold of a neuron is the critical level of depolarization that must be reached for an action potential to occur. Once this threshold is achieved, it triggers a rapid sequence of events, much like a row of falling dominoes where the first domino's fall causes a chain reaction. In both cases, reaching that initial threshold (the first domino tipping) is crucial for the subsequent events to unfold. If the threshold isn't met, the action stops, similar to how a row of dominoes won't fall if the first one remains upright.
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 occurs along an axon following a membrane reaching threshold potential?
When the membrane of an axon reaches threshold potential, voltage-gated sodium channels open, allowing sodium ions (Na⁺) to rush into the neuron. This influx of positive charge causes depolarization, which propagates along the axon as an action potential. As the membrane potential peaks, sodium channels close, and voltage-gated potassium channels open, allowing potassium ions (K⁺) to exit the cell, repolarizing the membrane. This sequence of events enables the rapid transmission of electrical signals along the axon.
What is the sequence of events along an axon?
The sequence of events along an axon involves the generation of an action potential at the axon hillock, propagation of the action potential down the axon via depolarization and repolarization of the membrane, and neurotransmitter release at the axon terminals to communicate with other neurons or target cells.
What do you call events that occur in a sequence?
You call them 'sequence of events'.
What is a sequence of rapidly occurring events that decrease and reverse the membrane potential and then eventually restore it to the resting state?
An action potential is a sequence of rapidly occurring events that decrease and reverse the membrane potential, followed by repolarization and ultimately restoration back to the resting state. This process involves the opening and closing of voltage-gated ion channels, resulting in the propagation of electrical signals along the neuron.
What stimulus below this intensity will result in no response in a neuron?
Any stimulus below the neuron's threshold potential will not result in a response, as it is not strong enough to generate an action potential. Neurons require a minimum level of stimulus intensity to reach the threshold potential and fire an action potential.
Membrane potential required to achieve threshold?
-55mV
How does threshold change during the relative refractory period?
During the relative refractory period, the threshold for excitation is increased compared to the resting threshold. This is because the membrane potential is closer to its resting state, making it more difficult to depolarize the cell and generate an action potential. It requires a stronger stimulus to overcome this increased threshold and trigger another action potential.
Minimum level of stimulation required to trigger a neural impulse?
The minimum level of stimulation required to trigger a neural impulse is known as the "threshold." This threshold is the minimum amount of neurotransmitter release or electrical stimulation needed to generate an action potential in a neuron. Below this threshold, the neuron will not fire an action potential.
