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While a neuron is waiting for sufficient stimulation, it maintains a resting membrane potential, typically around -70 mV, due to the distribution of ions across its membrane, primarily sodium (Na+) and potassium (K+). During this time, the neuron is polarized, with the inside being more negative compared to the outside. If the neuron receives enough excitatory signals to reach the threshold potential, it will initiate an action potential, leading to the rapid depolarization and subsequent repolarization of the membrane. Until then, the neuron remains in a ready state, capable of responding to incoming signals.
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Do nerve impulses begin in the axon of a neuron?
No, nerve impulses do not begin in the axon of a neuron; they typically begin in the dendrites or the cell body. When a neuron receives sufficient stimulation, it generates an action potential that travels down the axon. The axon then conducts this impulse away from the cell body towards other neurons or target tissues.
The area of the skin where stimulation generates action potentials in a particular sensory neuron is called that neuron's?
receptive field
What happens first following a neuron stimulation?
relife of back pain
Weak stimulation of a motor neuron causes the muscle to what?
contract weakly
What is the substance that halts the stimulation of a muscle fiber by a neuron called?
acetycholinesterase
What stops muscle stimulation when the motor neuron ceases firing?
Acetylcholinesterase is the enzyme that stops muscle stimulation when the motor neuron ceases firing. This enzyme enables acetyl and choline to release their binding sites.
Stimulus threshold of the neuron refers to what?
The stimulus threshold of a neuron, often referred to as the action potential threshold, is the minimum level of stimulation required to trigger an electrical impulse (action potential) in the neuron. When a stimulus exceeds this threshold, it causes sufficient depolarization of the neuron's membrane, leading to the rapid influx of sodium ions and the subsequent propagation of the action potential along the axon. If the stimulus is below this threshold, the neuron remains inactive, and no action potential is generated.
What is motor neuron firing?
Motor neuron firing refers to the process by which motor neurons generate action potentials, leading to the transmission of signals from the nervous system to muscles. When a motor neuron receives sufficient stimulation, it depolarizes and fires an action potential, causing the release of neurotransmitters at the neuromuscular junction. This triggers muscle contraction, enabling movement. The frequency and pattern of motor neuron firing can vary based on the type of movement being performed.
A brief change in electrical voltage in the neuron in response to stimulation is called what?
an action potential
In which order neural signals travel along a neuron?
Neural signals travel along a neuron in the following order: first, an electrical impulse called an action potential is generated at the axon hillock after the neuron receives sufficient stimulation. This impulse then travels down the axon, where it is propagated by the opening and closing of ion channels. Upon reaching the axon terminals, the signal triggers the release of neurotransmitters into the synaptic cleft, allowing communication with neighboring neurons.
What is the amount of stimulation required to intiate a nerve impulse called?
Neuron has to be stimulated to the point of it's threshold in order for an action potential to be initiated and transmitted
How is depolarization in a hair cell different from depolarization in a typical neuron?
Depolarization in a hair cell is triggered by mechanical stimulation, such as sound waves or movement, while depolarization in a typical neuron is triggered by chemical signals.
