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The axon hillock and the initial segment
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∙ 10y ago
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What is the secretory zone of neuron?
The secretory zone of a neuron refers to the region where neurotransmitters are synthesized, stored, and released. It includes the synaptic vesicles that contain the neurotransmitters and the presynaptic terminal where they are released into the synaptic cleft. This zone plays a crucial role in transmitting signals between neurons and facilitating communication in the nervous system.
What triggers an action potential?
An action potential is triggered when a sufficiently strong neural signal reaches the trigger zone of a neuron, which is the axon hillock or the initial segment of the axon.The trigger zone contains a dense concentration of voltage-gated sodium-ion pores, which open and allow sodium ions into the neuron when the membrane voltage there rises from about -70mV resting potential to a trigger threshold of about -55mV as a result of a summing of inputs to the neuron.The resulting inrush of sodium ions through the ion pores is the beginning of the action potential.
The input zone of a neuron is the?
­The dendrites and cell body. Incoming signals from other neurons are received here.
What does it take to trigger an action potential?
neurotransmitters from the presynaptic neuron must be released and binded to the ligand gated sodium channels to increase the membrane potential (increase the charge) until it reaches the threshold of the trigger zone which is -55 millivolts.
What is the basic structure of a neuron?
A neuron consists of three major parts: The dendrites, cell body, and axon. Most, though not all, axons are covered with myelin sheath which is made up of glial cells. The ends of axons are further divided into axon terminals. The axon terminal of one neuron and the dendrites of another is separated by the synaptic cleft.
A neuron reaches its trigger point when?
Action potential is nerve impulse triggered when a neuron reaches its threshold, or trigger point for firing. Threshold trigger point for a neuron's firing about negative 50 millivolts.
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).
What is the input zone of a motor neuron?
dendrites
What is the secretory zone of neuron?
The secretory zone of a neuron refers to the region where neurotransmitters are synthesized, stored, and released. It includes the synaptic vesicles that contain the neurotransmitters and the presynaptic terminal where they are released into the synaptic cleft. This zone plays a crucial role in transmitting signals between neurons and facilitating communication in the nervous system.
Neurotransmitters find their way to and subsequently trigger firing of that neuron?
Excitatory neurotransmitter
What triggers an action potential?
An action potential is triggered when a sufficiently strong neural signal reaches the trigger zone of a neuron, which is the axon hillock or the initial segment of the axon.The trigger zone contains a dense concentration of voltage-gated sodium-ion pores, which open and allow sodium ions into the neuron when the membrane voltage there rises from about -70mV resting potential to a trigger threshold of about -55mV as a result of a summing of inputs to the neuron.The resulting inrush of sodium ions through the ion pores is the beginning of the action potential.
What is the transmission zone of a neuron?
I have never heard of the term 'transmission zone' (which may be someone's personal name for what I'm about to explain) but neurons send their chemical signals across what is known as a synapse, the region where the axon of one neuron meets up with another neuron (most often a dendrite). The space between these two neurons (the non-neuron space in the synapse) is called the synaptic cleft. Through this space, neurotransmitters pass through and act on the receiving neuron once they reach it.
The input zone of a neuron is the?
­The dendrites and cell body. Incoming signals from other neurons are received here.
What part of the brainstem that receives information from the chemoreceptor trigger zone?
Medulla Oblangota
What is the receptor of a reflex arc?
Sensory receptor located at the distal end of a neuron or an associated sensory structure. When stimulated it creates a receptor potential, when that reaches its threshold, it will trigger 1 or more nerve impulses in the sensory neuron.
What does it take to trigger an action potential?
neurotransmitters from the presynaptic neuron must be released and binded to the ligand gated sodium channels to increase the membrane potential (increase the charge) until it reaches the threshold of the trigger zone which is -55 millivolts.
Excruciating facial pain upon stimulation of a trigger zone?
Bootje patrick...bootje
