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What has to be crossed before the neuron fires?
The threshold potential must be reached for the neuron to fire. This is the level of depolarization that triggers an action potential to be generated and propagated along the neuron.
Neurons in which dendritic and axonal processes are continuous and the soma lies off to one side are called?
Bipolar neurons have only one axon and one dendrite with the soma between them. There are probably very few, if any, neurons that contain only a single axon and dendrite. However, the concept is useful because some neurons behave as if they only had a single axon and dendrite. These neurons, called bipolar neurons because their cell body sits in between the axon and dendrite (giving the neuron two "poles"), are abundant in the nervous system. One very important type of bipolar neuron occurs in the retina, and is responsible for how we process light at an early level.
What is the response if you increase the stimulus intensity past the threshold level for a neuron?
Increasing the stimulus intensity past the threshold level for a neuron will not further increase the action potential generated. Once the threshold is reached, the neuron will fire an action potential at its maximum intensity.
What happens at the level of the neuron starting with stimulus and ending with a response?
The stimulus is detected by the sensory receptor. The sensory receptor stimulates a sensory neuron. The sensory neuron transmits to the interneuron in the spinal cord. The interneuron stimulates a motor neuron. The motor neuron communicates to the muscle. The muscle(effector) then produces the response allowing the body to respond to the stimulus.
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 minimum level of a stimiulus required to activate a neuron?
threshold
What has to be crossed before the neuron fires?
The threshold potential must be reached for the neuron to fire. This is the level of depolarization that triggers an action potential to be generated and propagated along the neuron.
The shutting down of a biochemical pathway caused by a key enzyme's sensitivity to the level of the pathway's product?
Feedback Inhibition
Neurons in which dendritic and axonal processes are continuous and the soma lies off to one side are called?
Bipolar neurons have only one axon and one dendrite with the soma between them. There are probably very few, if any, neurons that contain only a single axon and dendrite. However, the concept is useful because some neurons behave as if they only had a single axon and dendrite. These neurons, called bipolar neurons because their cell body sits in between the axon and dendrite (giving the neuron two "poles"), are abundant in the nervous system. One very important type of bipolar neuron occurs in the retina, and is responsible for how we process light at an early level.
What is the response if you increase the stimulus intensity past the threshold level for a neuron?
Increasing the stimulus intensity past the threshold level for a neuron will not further increase the action potential generated. Once the threshold is reached, the neuron will fire an action potential at its maximum intensity.
What is the first function effected by drinking?
High-level cognitive skills, most noticeably judgment and inhibition (executive skills).
What happens when a neurons is above its threshold level?
When a neuron is above its threshold level, it generates an action potential. This is an electrical impulse that travels down the neuron's axon, triggering the release of neurotransmitters at the synapse. This allows communication with other neurons or muscles.
How does the cell body of the neuron collect info?
It doesn't. Any "info" collected is at the level of the synapse.
What happens at the level of the neuron starting with stimulus and ending with a response?
The stimulus is detected by the sensory receptor. The sensory receptor stimulates a sensory neuron. The sensory neuron transmits to the interneuron in the spinal cord. The interneuron stimulates a motor neuron. The motor neuron communicates to the muscle. The muscle(effector) then produces the response allowing the body to respond to the stimulus.
What is the trigger point at which a neuron will fire called?
Its where there are a lot of sodium channels. Once the trigger zone is 'triggered' to threshold (from -70mV to -55mv), then an action potential occurs. trigger zone in MOTOR neurons are in the axon hillock and in SENSORY neurons, they're in the 1st unmyelinated area (first node of ranvier).
The simplest level of CNS function is the?
The simplest level of CNS function is the reflex arc. It involves a sensory neuron detecting a stimulus and sending a signal to the spinal cord, which then immediately sends a signal back through a motor neuron to produce a response, without involving the brain.
What happens to a neuron when a stimulus reaches the threshold level?
It simply and completely self destructs. You see, once the threshold is reached it no longer can sustance its physical structure due to power surges. This results in an power overload just like when a star such as the sun reaches critical level and eventually explodes resulting in a Supernova.
