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What is stimulus threshold?
ST - In regards to excitable cell (i.e. neurons) the minimum mV need to trigger a AP (action potential) and is around -40mV (although this may vary depending on the cell). In additional to this; excitable cells (i.e. neurons) shows an all-or-nothing property, such that if the stimulus threshold is not met the action potential will not be created.
Disturbances when will sensory neurons result in an action potential?
if the graded potential of threshold size reaches a trigger zone
Minimum level of stimulation required to trigger a neural impulse?
An action potential needs to occur to trigger the neurons but the action potential depends on whether a stimulus is able to bring the membrane potential to a certain level termed the THRESHOLD. This threshold is about -55 mV for most neurons, but the stimulus needs to bring the membrane potential to this certain level or it will not be triggered. Relating to the ALL-OR-NONE PRINCIPLE, which if the threshold is not acquired then an action potential will not occur but once a stimulus is strong enough to depolarize (making the inside of the cell less negative going from -70 mV to -55 mV) it will trigger. The resting potential is -70 mV which the stimulus needs to bring it up to -55mV.
How can neurotransmitters inhibit or excite a postsynaptic neurons?
Inhibit it by hyper polarizing the membrane or excite it by bringing the voltage closer to the threshold potential.
Can neurons be replaced easily?
No, they can never be replaced. You are born with all the neurons you will ever have
When several neurons are stimulated equally which one will fire first?
The neuron with the lowest threshold potential will fire first when several neurons are stimulated equally. Threshold potential is the minimum level of depolarization needed to trigger an action potential in a neuron. Neurons with lower threshold potentials are more excitable and will fire before neurons with higher threshold potentials.
What happens when a neurons is above its threshold level?
its depolarized.
What is stimulus threshold?
ST - In regards to excitable cell (i.e. neurons) the minimum mV need to trigger a AP (action potential) and is around -40mV (although this may vary depending on the cell). In additional to this; excitable cells (i.e. neurons) shows an all-or-nothing property, such that if the stimulus threshold is not met the action potential will not be created.
When a neuron reaches its threshold?
When a neuron reaches its threshold, it initiates an action potential. This is a brief electrical impulse that allows for communication between neurons. The action potential travels down the axon of the neuron to transmit signals to other neurons or cells.
Disturbances when will sensory neurons result in an action potential?
if the graded potential of threshold size reaches a trigger zone
What specific effects oes cafffine have on neurons?
The effect that caffeine has on neurons is to make them more sensitive to the effects of neurotransmitters. Caffeine lowers the threshold and makes the neurons more sensitive. This means it takes less of the neurotransmitter to affect another neuron.
Minimum level of stimulation required to trigger a neural impulse?
An action potential needs to occur to trigger the neurons but the action potential depends on whether a stimulus is able to bring the membrane potential to a certain level termed the THRESHOLD. This threshold is about -55 mV for most neurons, but the stimulus needs to bring the membrane potential to this certain level or it will not be triggered. Relating to the ALL-OR-NONE PRINCIPLE, which if the threshold is not acquired then an action potential will not occur but once a stimulus is strong enough to depolarize (making the inside of the cell less negative going from -70 mV to -55 mV) it will trigger. The resting potential is -70 mV which the stimulus needs to bring it up to -55mV.
How can neurotransmitters inhibit or excite a postsynaptic neurons?
Inhibit it by hyper polarizing the membrane or excite it by bringing the voltage closer to the threshold potential.
Why does the nerve action potential increase slightly when you add 1.0 V to the threshold voltage and stimulate nerve?
The action potential increases slightly because more neurons are being stimulated.
When classified according to structure all neurons are?
Afferent neurons
Are all the efferent neurons motor all the afferent neurons sensory and all the CNS neurons inter neurons?
Yes. However, it is better put that most of the interneurons are found in the part of the CNS called the spinal cord.
Which nervous system contains all the sensory neurons and all the voluntary motor neurons?
A somatic system
